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Bubnov MP, Zolotukhin AA, Fukin GK, Rumyantcev RV, Bogomyakov AS. Valence tautomeric interconversion of bis-dioxolene cobalt complex with imino-pyridine functionalized by TEMPO moiety in solid solutions with isostructural nickel analogue: phase transitions and monocrystal destruction. Dalton Trans 2024; 53:9151-9160. [PMID: 38742270 DOI: 10.1039/d4dt00453a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
Valence tautomeric complexes (VT) are promising systems for creating molecular devices. From this viewpoint, valence tautomeric complexes with a hysteresis loop on the magnetic curve are of special interest as potential memory elements. The hysteresis loop is a consequence of retarded structural rearrangements which investigation is an actual problem. Recently, we have described a new VT transition taking place in a bis-dioxolene cobalt complex with imino-pyridine having a TEMPO substituent (A. A. Zolotukhin, et al., Inorg. Chem., 2017, 56, 14751-14754). Valence tautomeric transformation occurs with a hysteresis loop and is accompanied by a phase transition. The phase transition taking place during cooling is accompanied by crystal destruction. This fact makes it impossible to monitor the structural changes responsible for the hysteresis loop. The current research attempts to resolve this problem. A nickel compound of the same composition (TEMPO-imino-pyridine)Ni(3,6-DBSQ)2 was synthesized and characterized. It was established to be isostructural with the cobalt complex. It was used as an inert matrix for the dilution of the VT cobalt complex. The number of solid solutions with Co/Ni ratios of 1 : 1, 1 : 2, 1 : 4, and 1 : 8 was obtained. Variable temperature magnetic susceptibility measurements show that VT transformation with a hysteresis loop takes place in all solid solutions. The hysteresis loop is shifted to low temperatures primarily due to the shifting of its low-temperature boundary with dilution. The hysteresis width does not change significantly with dilution. DSC detected that transformations are accompanied by phase transitions at different temperatures at cooling and heating. The phase transition at the first cooling occurs at slightly lower temperatures compared with subsequent cycles. These temperatures correspond to the transition temperatures detected from the magnetic curves. The phase transition during the first cooling is accompanied by crystal destruction. Physical destruction takes place in the crystals of all solid solutions. X-ray diffraction powder patterns confirm that phase transition is accompanied by considerable reorganization of the crystal structure typical for the first order transitions. The unit cell volume of solid solutions is larger than that of pure complexes. Especially calculated crystal invariom indicated that the "lattice energy" in a solid solution is the lowest compared with that in "pure" nickel and cobalt complexes.
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Affiliation(s)
- Michael P Bubnov
- G. A. Razuvaev Institute of Organometallic Chemistry of RAS, 49 Tropinina Str., GSP-445, 603950 Nizhny Novgorod, Russia.
| | - Alexey A Zolotukhin
- G. A. Razuvaev Institute of Organometallic Chemistry of RAS, 49 Tropinina Str., GSP-445, 603950 Nizhny Novgorod, Russia.
| | - Georgy K Fukin
- G. A. Razuvaev Institute of Organometallic Chemistry of RAS, 49 Tropinina Str., GSP-445, 603950 Nizhny Novgorod, Russia.
| | - Roman V Rumyantcev
- G. A. Razuvaev Institute of Organometallic Chemistry of RAS, 49 Tropinina Str., GSP-445, 603950 Nizhny Novgorod, Russia.
| | - Artem S Bogomyakov
- International Tomography Center of the SB of RAS, Institutskaya Str., 3a, Novosibirsk 630090, Russia.
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2
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Schreck C, Schönfeld S, Liebing P, Hörner G, Weber B. Binucleating Jäger-type {(N 2O 2) 2} 4- ligands: magnetic and electronic interactions of Fe(II), Ni(II) and Cu(II) across an in-plane TTF-bridge. Dalton Trans 2024; 53:9092-9105. [PMID: 38738956 DOI: 10.1039/d4dt00479e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/14/2024]
Abstract
The simultaneous presence of different electrophores provides an interesting playground for responsive materials. Herein, we present the incorporation of a twice-reversibly oxidizable tetrathiafulvalene (TTF) unit into a binucleating ligand, bridging two metal centers in a fully conjugated plane. A two-step synthesis scheme gave the D2h symmetric Schiff base-like ligand H4L in moderate yields from which the corresponding copper(II) [Cu2L], nickel(II) [Ni2L], [Ni2L(py)4] and iron(II) complexes [Fe2L(py)4], [Fe2L(dmap)4] and [Fe2L(bpee)2]·1 Tol could be obtained. Characterization was performed through 1H-NMR, IR, UV-vis and 57Fe-Mössbauer spectroscopy, SQUID magnetometry and cyclic voltammetry, supported by density functional theory (DFT) calculations. Single crystal X-ray analysis of [Ni2L(py)4] revealed six-coordinate paramagnetic centers, whereas [Ni2L] underwent gradual coordination induced spin state switching (CISSS) in solution. The magnetic independence of both metal centers is echoed by close-to-ideal Curie-plots of the [Cu2L] system and the gradual spin crossover of all iron(II) compounds. By contrast, cyclic voltammetry measurements in solution indicated oxidation-dependent TTF-metal interactions, as well as metal-metal interactions. The reversible TTF-borne events in H4L and [Ni2L] are overlaid with metal-borne events in the case of [Fe2L(py)4], as is corroborated by an analysis of the frontier orbital landscapes and through diagnostic spectral features upon chemical oxidation.
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Affiliation(s)
- Constantin Schreck
- Department of Chemistry, Inorganic Chemistry, University of Bayreuth, 95447 Bayreuth, Germany.
| | - Sophie Schönfeld
- Department of Chemistry, Inorganic Chemistry, University of Bayreuth, 95447 Bayreuth, Germany.
| | - Phil Liebing
- New address: Institute for Inorganic and Analytical Chemistry, Faculty of Chemistry and Earth Sciences, Friedrich-Schiller-University Jena, Germany
| | - Gerald Hörner
- Department of Chemistry, Inorganic Chemistry, University of Bayreuth, 95447 Bayreuth, Germany.
- New address: Institute for Inorganic and Analytical Chemistry, Faculty of Chemistry and Earth Sciences, Friedrich-Schiller-University Jena, Germany
| | - Birgit Weber
- Department of Chemistry, Inorganic Chemistry, University of Bayreuth, 95447 Bayreuth, Germany.
- New address: Institute for Inorganic and Analytical Chemistry, Faculty of Chemistry and Earth Sciences, Friedrich-Schiller-University Jena, Germany
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3
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Zakrzewski J, Liberka M, Wang J, Chorazy S, Ohkoshi SI. Optical Phenomena in Molecule-Based Magnetic Materials. Chem Rev 2024; 124:5930-6050. [PMID: 38687182 PMCID: PMC11082909 DOI: 10.1021/acs.chemrev.3c00840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Since the last century, we have witnessed the development of molecular magnetism which deals with magnetic materials based on molecular species, i.e., organic radicals and metal complexes. Among them, the broadest attention was devoted to molecule-based ferro-/ferrimagnets, spin transition materials, including those exploring electron transfer, molecular nanomagnets, such as single-molecule magnets (SMMs), molecular qubits, and stimuli-responsive magnetic materials. Their physical properties open the application horizons in sensors, data storage, spintronics, and quantum computation. It was found that various optical phenomena, such as thermochromism, photoswitching of magnetic and optical characteristics, luminescence, nonlinear optical and chiroptical effects, as well as optical responsivity to external stimuli, can be implemented into molecule-based magnetic materials. Moreover, the fruitful interactions of these optical effects with magnetism in molecule-based materials can provide new physical cross-effects and multifunctionality, enriching the applications in optical, electronic, and magnetic devices. This Review aims to show the scope of optical phenomena generated in molecule-based magnetic materials, including the recent advances in such areas as high-temperature photomagnetism, optical thermometry utilizing SMMs, optical addressability of molecular qubits, magneto-chiral dichroism, and opto-magneto-electric multifunctionality. These findings are discussed in the context of the types of optical phenomena accessible for various classes of molecule-based magnetic materials.
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Affiliation(s)
- Jakub
J. Zakrzewski
- Faculty
of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
- Doctoral
School of Exact and Natural Sciences, Jagiellonian
University, Lojasiewicza
11, 30-348 Krakow, Poland
| | - Michal Liberka
- Faculty
of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
- Doctoral
School of Exact and Natural Sciences, Jagiellonian
University, Lojasiewicza
11, 30-348 Krakow, Poland
| | - Junhao Wang
- Department
of Materials Science, Faculty of Pure and Applied Science, University of Tsukuba, 1-1-1 Tonnodai, Tsukuba, Ibaraki 305-8573, Japan
| | - Szymon Chorazy
- Faculty
of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Shin-ichi Ohkoshi
- Department
of Chemistry, School of Science, The University
of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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4
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Yue LT, Shapovalova SO, Hu JS, Chegerev MG, Zhao YM, Liu CD, Yu M, Starikova AA, Guda AA, Yao ZS, Tao J. Molecular Twist-Induced Single-Crystal Isomerization and Valence Tautomeric Transitions in a Cobalt-Dioxolene Complex. Angew Chem Int Ed Engl 2024; 63:e202401950. [PMID: 38453651 DOI: 10.1002/anie.202401950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2024] [Revised: 03/05/2024] [Accepted: 03/07/2024] [Indexed: 03/09/2024]
Abstract
A mononuclear valence tautomeric (VT) complex, [Co(pycz)2(Sq)(Cat)] (1-trans), where pycz = 9-(pyridin-4-yl)-9H-carbazole, Sq⋅- = 3,5-di-tert-butyl-semiquinonato, and Cat2- = 3,5-di-tert-butyl-catecholato, is synthesized in the trans configuration, which undergoes one-step valence tautomeric transition above room temperature. Remarkably, 1-trans can transform into its isomeric structure, [Co(pycz)2(Sq)(Sq)] (1-cis), at temperature above 350 K in a single-crystal-to-single-crystal way by in situ molecular twist, and the resulting 1-cis exhibits a pronounced two-step VT transition during magnetic measurements that is rare for mononuclear VT complexes. Such drastic solid-state structural transformation is reported in VT compounds for the first time, which is actuated by a crystal surface's melting-recrystallization induced phase transition process. DFT calculations offer an underlying mechanism suggesting a concerted bond rotation during the structural transformation. The results demonstrate an unconventional approach that realizes structural transformation of VT complexes and the control of VT performance.
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Affiliation(s)
- Ling-Tai Yue
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Liangxiang Campus, Beijing, 102488, China
| | - Svetlana O Shapovalova
- The Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, Rotov-on-Don, 344090, Russian Federation
| | - Jie-Sheng Hu
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Liangxiang Campus, Beijing, 102488, China
| | - Maxim G Chegerev
- Institute of Physical and Organic Chemistry, Southern Federal University, Stachka Avenue 194/2, Rotov-on-Don, 344090, Russian Federation
| | - Yu-Meng Zhao
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Liangxiang Campus, Beijing, 102488, China
| | - Cheng-Dong Liu
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Liangxiang Campus, Beijing, 102488, China
| | - Meng Yu
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Liangxiang Campus, Beijing, 102488, China
| | - Alyona A Starikova
- Institute of Physical and Organic Chemistry, Southern Federal University, Stachka Avenue 194/2, Rotov-on-Don, 344090, Russian Federation
| | - Alexander A Guda
- The Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, Rotov-on-Don, 344090, Russian Federation
| | - Zi-Shuo Yao
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Liangxiang Campus, Beijing, 102488, China
| | - Jun Tao
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Liangxiang Campus, Beijing, 102488, China
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5
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M Zahir FZ, Hay MA, Janetzki JT, Gable RW, Goerigk L, Boskovic C. Predicting valence tautomerism in diverse cobalt-dioxolene complexes: elucidation of the role of ligands and solvent. Chem Sci 2024; 15:5694-5710. [PMID: 38638213 PMCID: PMC11023039 DOI: 10.1039/d3sc04493a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Accepted: 03/08/2024] [Indexed: 04/20/2024] Open
Abstract
The ability of molecular switches to reversibly interconvert between different forms promises potential applications at the scale of single molecules up to bulk materials. One type of molecular switch comprises cobalt-dioxolene compounds that exhibit thermally-induced valence tautomerism (VT) interconversions between low spin Co(iii)-catecholate (LS-CoIII-cat) and high spin Co(ii)-semiquinonate (HS-CoII-sq) forms. Two families of these compounds have been investigated for decades but have generally been considered separately: neutral [Co(diox)(sq)(N2L)] and cationic [Co(diox)(N4L)]+ complexes (diox = generic dioxolene, N2L/N4L = bidentate/tetradentate N-donor ancillary ligand). Computational identification of promising new candidate compounds prior to experimental exploration is beneficial for environmental and cost considerations but requires a thorough understanding of the underlying thermochemical parameters that influence the switching. Herein, we report a robust approach for the analysis of both cobalt-dioxolene families, which involved a quantitative density functional theory-based study benchmarked with reliable quasi-experimental references. The best-performing M06L-D4/def2-TZVPP level of theory has subsequently been verified by the synthesis and experimental investigation of three new complexes, two of which exhibit thermally-induced VT, while the third remains in the LS-CoIII-cat form across all temperatures, in agreement with prediction. Valence tautomerism in solution is markedly solvent-dependent, but the origin of this has not been definitively established. We have extended our computational approach to elucidate the correlation of VT transition temperature with solvent stabilisation energy and change in dipole moment. This new understanding may inform the development of VT compounds for applications in soft materials including films, gels, and polymers.
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Affiliation(s)
- F Zahra M Zahir
- School of Chemistry, University of Melbourne Victoria 3010 Australia
| | - Moya A Hay
- School of Chemistry, University of Melbourne Victoria 3010 Australia
| | - Jett T Janetzki
- School of Chemistry, University of Melbourne Victoria 3010 Australia
| | - Robert W Gable
- School of Chemistry, University of Melbourne Victoria 3010 Australia
| | - Lars Goerigk
- School of Chemistry, University of Melbourne Victoria 3010 Australia
| | - Colette Boskovic
- School of Chemistry, University of Melbourne Victoria 3010 Australia
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6
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Fischer TE, Janetzki JT, M Zahir FZ, Gable RW, Starikova AA, Boskovic C. Tuning valence tautomerism in a family of dinuclear cobalt complexes incorporating a conjugated bridging bis(dioxolene) ligand with weak communication. Dalton Trans 2024. [PMID: 38236053 DOI: 10.1039/d3dt04162j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2024]
Abstract
Valence tautomerism (VT) involves the stimulated reversible intramolecular electron transfer between a redox-active metal and ligand. Dinuclear cobalt complexes bridged by bis(dioxolene) ligands can undergo thermally-induced VT with access to {CoIII-cat-cat-CoIII}, {CoIII-cat-SQ-CoII} and {CoII-SQ-SQ-CoII} states (cat2- = catecholate, SQ˙- = semiquinonate, CoIII refers to low spin CoIII, CoII refers to high spin CoII). The resulting potential for two-step VT interconversions offers increased functionality over mononuclear examples. In this study, the bis(dioxolene) ligand 3,3',4,4'-tetrahydroxy-5,5'-dimethoxy-benzaldazine (thMH4) was paired with Mentpa (tpa = tris(2-pyridylmethyl)amine, n = 0-3 corresponds to methylation at 6-position of the pyridine rings) to afford [{Co(Mentpa)}2(thM)](PF6)2 (1a, n = 0; 2a, n = 2; 3a, n = 3). Structural, magnetic susceptibility and spectroscopic data show that 1a and 3a remain in the temperature invariant {CoIII-cat-cat-CoIII} and {CoII-SQ-SQ-CoII} forms in the solid state, respectively. In contrast, 2a exhibits incomplete thermally-induced VT between these two tautomeric forms via the mixed {CoIII-cat-SQ-CoII} tautomer. In solution, room temperature electronic absorption spectra are consistent with the assignments from the solid-state, with VT observed only for 2a. From electrochemistry, the proximity of the two 1e--processes for the thMn- ligand indicates weak electronic communication between the two dioxolene units, supporting the potential for a two-step VT interconversion in thMn- containing complexes. Comparison of the redox potentials of the Co and thMn- processes suggests that only 2a has these processes in sufficient proximity to afford the thermally-induced VT observed experimentally. Density functional theory calculations are consistent with the prerequisite energy ordering for a two-step transition for 2a, and temperature invariant {CoIII-cat-cat-CoIII} and {CoII-SQ-SQ-CoII} states for 1a and 3a, respectively. This work presents the third example, and the first formally conjugated example, of a bridging bis(dioxolene) ligand that can afford two-step VT in a Co complex, suggesting new possibilities towards applications based on multistep switching.
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Affiliation(s)
- Tristan E Fischer
- School of Chemistry, University of Melbourne, Parkville, 3010 Victoria, Australia.
| | - Jett T Janetzki
- School of Chemistry, University of Melbourne, Parkville, 3010 Victoria, Australia.
| | - F Zahra M Zahir
- School of Chemistry, University of Melbourne, Parkville, 3010 Victoria, Australia.
| | - Robert W Gable
- School of Chemistry, University of Melbourne, Parkville, 3010 Victoria, Australia.
| | - Alyona A Starikova
- Institute of Physical and Organic Chemistry, Southern Federal University, 344090, Rostov-on-Don, Russian Federation
| | - Colette Boskovic
- School of Chemistry, University of Melbourne, Parkville, 3010 Victoria, Australia.
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7
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Kc K, Woods T, Olshansky L. Ligand Modifications Produce Two-Step Magnetic Switching in a Cobalt(dioxolene) Complex. Angew Chem Int Ed Engl 2023; 62:e202311790. [PMID: 37733206 PMCID: PMC10615740 DOI: 10.1002/anie.202311790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Revised: 09/20/2023] [Accepted: 09/21/2023] [Indexed: 09/22/2023]
Abstract
Mononuclear monodioxolene valence tautomeric (VT) cobalt complexes typically exist in their low spin (l.s.) CoIII (cat2- ) and high spin (h.s.) CoII (sq⋅- ) forms (cat2- =catecholato, and sq⋅- =seminquinonato forms of 3,5-di-t Bu-1,2-dioxolene), which reversibly interconvert via temperature-dependent intramolecular electron transfer. Typically, the remaining four coordination sites on cobalt are supported by a tetradentate ligand whose properties influence the temperature at which VT occurs. We report that replacing one chelating pyridyl arm of tris(2-pyridylmethyl)amine (tpa) with a weaker field ortho-anisole moiety facilitates access to a third magnetic state, and examine a series of related complexes. Variable temperature crystallographic, magnetic, calorimetric, and spectroscopic studies support that this third state is consistent with l.s. CoII (sq⋅- ). Thus, our ligand modifications not only provide access to the VT transition from l.s. CoIII (cat2- ) to l.s. CoII (sq⋅- ), but at higher temperatures, the complex undergoes spin crossover from l.s. CoII (sq⋅- ) to h.s. CoII (sq⋅- ), representing the first example of two-step magnetic switching in a mononuclear monodioxolene cobalt complex. We hypothesize that ligand dynamicity may facilitate access to the rarely observed l.s. CoII (sq⋅- ) intermediate state, suggesting a new design criterion in the development of stimulus-responsive multi-state molecular switches.
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Affiliation(s)
- Khadanand Kc
- Department of Chemistry, Center for Biophysics and Quantitative Biology, Materials Research Laboratory, University of Illinois, Urbana-Champaign, Urbana, Illinois, 61801, USA
| | - Toby Woods
- George L. Clark X-Ray Facility and 3 M Materials Laboratory, University of Illinois, Urbana-Champaign, Urbana, Illinois, 61801, USA
| | - Lisa Olshansky
- Department of Chemistry, Center for Biophysics and Quantitative Biology, Materials Research Laboratory, University of Illinois, Urbana-Champaign, Urbana, Illinois, 61801, USA
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8
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Janetzki JT, Chegerev MG, Gransbury GK, Gable RW, Clegg JK, Mulder RJ, Jameson GNL, Starikova AA, Boskovic C. Controlling Spin Crossover in a Family of Dinuclear Fe(III) Complexes via the Bis(catecholate) Bridging Ligand. Inorg Chem 2023; 62:15719-15735. [PMID: 37691232 DOI: 10.1021/acs.inorgchem.3c02598] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/12/2023]
Abstract
Spin crossover (SCO) complexes can reversibly switch between low spin (LS) and high spin (HS) states, affording possible applications in sensing, displays, and molecular electronics. Dinuclear SCO complexes with access to [LS-LS], [LS-HS], and [HS-HS] states may offer increased levels of functionality. The nature of the SCO interconversion in dinuclear complexes is influenced by the local electronic environment. We report the synthesis and characterization of [{FeIII(tpa)}2spiro](PF6)2 (1), [{FeIII(tpa)}2Br4spiro](PF6)2 (2), and [{FeIII(tpa)}2thea](PF6)2 (3) (tpa = tris(2-pyridylmethyl)amine, spiroH4 = 3,3,3',3'-tetramethyl-1,1'-spirobi(indan)-5,5',6,6'-tetraol, Br4spiroH4 = 3,3,3',3'-tetramethyl-1,1'-spirobi(indan)-4,4',7,7'-tetrabromo-5,5',6,6'-tetraol, theaH4 = 2,3,6,7-tetrahydroxy-9,10-dimethyl-9,10-dihydro-9,10-ethanoanthracene), utilizing non-conjugated bis(catecholate) bridging ligands. In the solid state, magnetic and structural analysis shows that 1 remains in the [HS-HS] state, while 2 and 3 undergo a partial SCO interconversion upon cooling from room temperature involving the mixed [LS-HS] state. In solution, all complexes undergo SCO from [HS-HS] at room temperature, via [LS-HS] to mixtures including [LS-LS] at 77 K, with the extent of SCO increasing in the order 1 < 2 < 3. Gas phase density functional theory calculations suggest a [LS-LS] ground state for all complexes, with the [LS-HS] and [HS-HS] states successively destabilized. The relative energy separations indicate that ligand field strength increases following spiro4- < Br4spiro4- < thea4-, consistent with solid-state magnetic and EPR behavior. All three complexes show stabilization of the [LS-HS] state in relation to the midpoint energy between [LS-LS] and [HS-HS]. The relative stability of the [LS-HS] state increases with increasing ligand field strength of the bis(catecholate) bridging ligand in the order 1 < 2 < 3. The bromo substituents of Br4spiro4- increase the ligand field strength relative to spiro4-, while the stronger ligand field provided by thea4- arises from extension of the overlapping π-orbital system across the two catecholate units. This study highlights how SCO behavior in dinuclear complexes can be modulated by the bridging ligand, providing useful insights for the design of molecules that can be interconverted between more than two states.
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Affiliation(s)
- Jett T Janetzki
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
| | - Maxim G Chegerev
- Institute of Physical and Organic Chemistry, Southern Federal University, Rostov-on-Don 344090, Russian Federation
| | - Gemma K Gransbury
- Department of Chemistry, The University of Manchester, Manchester M13 9PL, U.K
| | - Robert W Gable
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
| | - Jack K Clegg
- University of Queensland, St Lucia, Queensland 4072, Australia
| | | | - Guy N L Jameson
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
| | - Alyona A Starikova
- Institute of Physical and Organic Chemistry, Southern Federal University, Rostov-on-Don 344090, Russian Federation
| | - Colette Boskovic
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
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9
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Moledo Vicente Guedes A, Sodré de Abreu L, Maldonado IAV, Fernandes WS, Cardozo TM, A Allão Cassaro R, Scarpellini M, Poneti G. Valence tautomerism in a cobalt-dioxolene complex containing an imidazolic ancillary ligand. RSC Adv 2023; 13:20050-20057. [PMID: 37409047 PMCID: PMC10318486 DOI: 10.1039/d3ra03235c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Accepted: 06/22/2023] [Indexed: 07/07/2023] Open
Abstract
This work reports the synthesis, structural, spectroscopic and magnetic investigation of two complexes, [Co(bmimapy)(3,5-DTBCat)]PF6·H2O (1) and [Co(bmimapy)(TCCat)]PF6·H2O (2), where bmimapy is an imidazolic tetradentate ancillary ligand and 3,5-DTBCat and TCCat are the 3,5-di-tert-butyl-catecholate and tetrachlorocatecholate anions, respectively. Their structures have been elucidated using single crystal X-ray diffraction, showing a pseudo-octahedral cobalt ion bound to a chelating dioxolene ligand and the ancillary bmimapy ligand in a folded conformation. Magnetometry displayed an entropy-driven, incomplete, Valence Tautomeric (VT) process for 1 in the 300-380 K temperature range, while 2 displayed a temperature independent, diamagnetic low-spin cobalt(iii)-catecholate charge distribution. This behaviour was interpreted on the basis of the cyclic voltammetric analysis, allowing the estimation of the free energy difference associated with the VT interconversion of +8 and +96 kJ mol-1 for 1 and 2, respectively. A DFT analysis of this free energy difference highlighted the ability of the methyl-imidazole pendant arm of bmimapy favouring the onset of the VT phenomenon. This work introduces the imidazolic bmimapy ligand to the scientific community working in the field of valence tautomerism, increasing the library of ancillary ligands to prepare temperature switchable molecular magnetic materials.
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Affiliation(s)
| | - Leandro Sodré de Abreu
- Instituto de Química, Universidade Federal do Rio de Janeiro Rio de Janeiro RJ 21941-909 Brazil
| | | | - William Silva Fernandes
- Instituto de Química, Universidade Federal do Rio de Janeiro Rio de Janeiro RJ 21941-909 Brazil
| | - Thiago Messias Cardozo
- Instituto de Química, Universidade Federal do Rio de Janeiro Rio de Janeiro RJ 21941-909 Brazil
| | - Rafael A Allão Cassaro
- Instituto de Química, Universidade Federal do Rio de Janeiro Rio de Janeiro RJ 21941-909 Brazil
| | - Marciela Scarpellini
- Instituto de Química, Universidade Federal do Rio de Janeiro Rio de Janeiro RJ 21941-909 Brazil
| | - Giordano Poneti
- Instituto de Química, Universidade Federal do Rio de Janeiro Rio de Janeiro RJ 21941-909 Brazil
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10
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Hay MA, Gable RW, Boskovic C. Modulating the electronic properties of divalent lanthanoid complexes with subtle ligand tuning. Dalton Trans 2023; 52:3315-3324. [PMID: 36806851 DOI: 10.1039/d2dt03782c] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Five new compounds of formula [LnII(Mentpa)2](BPh4)2 (Ln = Eu, n = 0 (1-Eu), n = 2 (2-Eu) and n = 3 (3-Eu); Ln = Yb, n = 0 (1-Yb) and n = 2 (2-Yb); tpa = tris(2-pyridylmethyl)amine, n = 0-3 corresponds to successive methylation of the 6-position of the pyridine rings of Mentpa) have been synthesized and their structural, photophysical and electrochemical properties investigated. The LnII ions in the five complexes possess cubic coordination geometry and exhibit only small structural differences, due to the lengthening of the Ln-N bonds to accommodate the additional steric bulk associated with increasing methylation of the Mentpa ligands. Photophysical studies indicate moderate shifts in absorbance, emission and excitation bands associated with the 4f7 ↔ 4f65d1 (EuII) and 4f14 ↔ 4f135d1 (YbII) transitions, while electrochemistry reveals modulation of the redox potential of the LnII to LnIII oxidation. There is a strong correlation between Ln-N bond lengths and both the photophysical transition energies and metal redox-potentials, revealing how subtle ligand changes and ligand field effects can be used to modulate the electronic properties of complexes of divalent lanthanoid ions. Utilization of these insights may ultimately afford design and property tuning strategies for future functional molecular complexes based on divalent lanthanoid metals.
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Affiliation(s)
- Moya A Hay
- School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia.
| | - Robert W Gable
- School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia.
| | - Colette Boskovic
- School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia.
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11
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Mishra E, Ekanayaka TK, Panagiotakopoulos T, Le D, Rahman TS, Wang P, McElveen KA, Phillips JP, Zaid Zaz M, Yazdani S, N'Diaye AT, Lai RY, Streubel R, Cheng R, Shatruk M, Dowben PA. Electronic structure of cobalt valence tautomeric molecules in different environments. NANOSCALE 2023; 15:2044-2053. [PMID: 36597843 DOI: 10.1039/d2nr06834f] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Future molecular microelectronics require the electronic conductivity of the device to be tunable without impairing the voltage control of the molecular electronic properties. This work reports the influence of an interface between a semiconducting polyaniline polymer or a polar poly-D-lysine molecular film and one of two valence tautomeric complexes, i.e., [CoIII(SQ)(Cat)(4-CN-py)2] ↔ [CoII(SQ)2(4-CN-py)2] and [CoIII(SQ)(Cat)(3-tpp)2] ↔ [CoII(SQ)2(3-tpp)2]. The electronic transitions and orbitals are identified using X-ray photoemission, X-ray absorption, inverse photoemission, and optical absorption spectroscopy measurements that are guided by density functional theory. Except for slightly modified binding energies and shifted orbital levels, the choice of the underlying substrate layer has little effect on the electronic structure. A prominent unoccupied ligand-to-metal charge transfer state exists in [CoIII(SQ)(Cat)(3-tpp)2] ↔ [CoII(SQ)2(3-tpp)2] that is virtually insensitive to the interface between the polymer and tautomeric complexes in the CoII high-spin state.
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Affiliation(s)
- Esha Mishra
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
| | - Thilini K Ekanayaka
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
| | | | - Duy Le
- Department of Physics, University of Central Florida, Orlando, FL 32816, USA.
| | - Talat S Rahman
- Department of Physics, University of Central Florida, Orlando, FL 32816, USA.
| | - Ping Wang
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA
| | - Kayleigh A McElveen
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Jared P Phillips
- Department of Physics, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, USA
| | - M Zaid Zaz
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
| | - Saeed Yazdani
- Department of Physics, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, USA
| | - Alpha T N'Diaye
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Rebecca Y Lai
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Robert Streubel
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
- Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - Ruihua Cheng
- Department of Physics, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, USA
| | - Michael Shatruk
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA
| | - Peter A Dowben
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
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12
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Takahashi N, Nishiyama T, Mibu T, Suenaga Y, Okubo T, Maekawa M, Kuroda-Sowa T. Dinuclear cobalt complexes with an asymmetric biphenyl bridging ligand, [Co2(LFBu)(bpqa)2](PF6)2 (H4LFBu = 5-fluoro-5′-tert-butyl-3,3′,4,4′-tetrahydroxybiphenyl, bpqa = bis(2-pyridylmethyl)(2-quinolylmethyl)amine): Spectroscopic, electrochemical and magnetic characterization. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.121095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Chegerev MG, Starikova AA. A computational search for spin-crossover in bis(catecholate) diiron complexes. COMPUT THEOR CHEM 2022. [DOI: 10.1016/j.comptc.2022.113693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Sun XP, Tang Z, Li J, Ma P, Yao ZS, Wang J, Niu J, Tao J. Discovery of Kinetic Effect in a Valence Tautomeric Cobalt-Dioxolene Complex. Inorg Chem 2022; 61:4240-4245. [PMID: 35234459 DOI: 10.1021/acs.inorgchem.1c03898] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Two isostructural valence tautomeric (VT) complexes with different critical temperatures were prepared and fully investigated through a series of magnetic, structural, spectral, and differential scanning calorimetry evidence. The kinetic effect in the VT complex was observed for the first time through scan-rate-dependent studies and further validated by annealing tests.
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Affiliation(s)
- Xiao-Peng Sun
- Henan Key Laboratory of Polyoxometalate Chemistry, Institute of Molecular and Crystal Engineering, School of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Zheng Tang
- Key Laboratory of Cluster Science of the Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, China
| | - Jiajia Li
- Henan Key Laboratory of Polyoxometalate Chemistry, Institute of Molecular and Crystal Engineering, School of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Pengtao Ma
- Henan Key Laboratory of Polyoxometalate Chemistry, Institute of Molecular and Crystal Engineering, School of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Zi-Shuo Yao
- Key Laboratory of Cluster Science of the Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, China
| | - Jingping Wang
- Henan Key Laboratory of Polyoxometalate Chemistry, Institute of Molecular and Crystal Engineering, School of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Jingyang Niu
- Henan Key Laboratory of Polyoxometalate Chemistry, Institute of Molecular and Crystal Engineering, School of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Jun Tao
- Key Laboratory of Cluster Science of the Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, China
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15
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Wang JP, Liu WT, Yu M, Ji XY, Liu JL, Chi MZ, Starikova AA, Tao J. One-Step versus Two-Step Valence Tautomeric Transitions in Tetraoxolene-Bridged Dinuclear Cobalt Compounds. Inorg Chem 2022; 61:4428-4441. [PMID: 35234043 DOI: 10.1021/acs.inorgchem.1c03944] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The syntheses of valence tautomeric compounds with multistep transitions using new redox-active ligands are the long-term goal of the field of bistable materials. The redox-active tetraoxolene ligand, 2,7-di-tert-butylpyrene-4,5,9,10-tetraone (pyreneQ-Q), is now developed to synthesize a pair of dinuclear compounds {[CoL2]2(pyreneSq-Sq)}[Co(CO)4]2·xCH2Cl2·2C6H5CH3 (1, x = 2, L = 1,10-phenanthroline, phen; 2, x = 1.5, L = 2,2'-bipyridine, bpy). Variable-temperature magnetic susceptibilities and single-crystal X-ray diffraction measurements indicate a partial one-step valence tautomeric transition for 1 and a rare two-step valence tautomeric transition for 2, respectively. DFT calculation results are consistent with the experimental data, revealing the correlation between thermodynamic parameters and the one-step/two-step valence tautomeric behaviors.
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Affiliation(s)
- Jia-Ping Wang
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, PR China
| | - Wen-Ting Liu
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, PR China
| | - Meng Yu
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, PR China
| | - Xue-Yang Ji
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, PR China
| | - Jing-Lin Liu
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, PR China
| | - Man-Zhou Chi
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, PR China
| | - Alyona A Starikova
- Institute of Physical and Organic Chemistry, Southern Federal University, Stachka Avenue 194/2, Rostov-on-Don 344090, Russian Federation
| | - Jun Tao
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, PR China
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16
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Chegerev MG, Korchagin DV, Shilov GV, Efimov NN, Starikov AG, Piskunov AV, Chernyshev AV, Bulgakov AN, Minkin VI, Palii AV, Aldoshin SM. Magnetically bistable cobalt-dioxolene complexes with a tetradentate N-donor base. Dalton Trans 2022; 51:16876-16889. [DOI: 10.1039/d2dt02874c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We describe a family of cobalt-dioxolene complexes exhibiting a high diversity of magnetic properties: from field-induced single-ion magnetism to thermally induced valence-tautomerism.
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Affiliation(s)
- Maxim G. Chegerev
- Institute of Physical and Organic Chemistry, Southern Federal University, Stachki Avenue, 194/2, 344090 Rostov-on-Don, Russia
| | - Denis V. Korchagin
- Institute of Problems of Chemical Physics, Russian Academy of Sciences, 1, Acad. Semenov prosp., 142432 Chernogolovka, Moscow Region, Russia
| | - Gennady V. Shilov
- Institute of Problems of Chemical Physics, Russian Academy of Sciences, 1, Acad. Semenov prosp., 142432 Chernogolovka, Moscow Region, Russia
| | - Nikolay N. Efimov
- Kurnakov Institute of General and Inorganic Chemistry, Leninsky avenue, 31, 119991 Moscow, Russia
| | - Andrey G. Starikov
- Institute of Physical and Organic Chemistry, Southern Federal University, Stachki Avenue, 194/2, 344090 Rostov-on-Don, Russia
| | - Alexandr V. Piskunov
- Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 49 Tropinina Str., GSP-445, 603950 Nizhny Novgorod, Russia
| | - Anatoly V. Chernyshev
- Institute of Physical and Organic Chemistry, Southern Federal University, Stachki Avenue, 194/2, 344090 Rostov-on-Don, Russia
| | - Aleksei N. Bulgakov
- The Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, 344090 Rostov-on-Don, Russia
| | - Vladimir I. Minkin
- Institute of Physical and Organic Chemistry, Southern Federal University, Stachki Avenue, 194/2, 344090 Rostov-on-Don, Russia
| | - Andrei V. Palii
- Institute of Problems of Chemical Physics, Russian Academy of Sciences, 1, Acad. Semenov prosp., 142432 Chernogolovka, Moscow Region, Russia
| | - Sergey M. Aldoshin
- Institute of Problems of Chemical Physics, Russian Academy of Sciences, 1, Acad. Semenov prosp., 142432 Chernogolovka, Moscow Region, Russia
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17
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Fioravanti L, Bellucci L, Armelao L, Bottaro G, Marchetti F, Pineider F, Poneti G, Samaritani S, Labella L. Stoichiometrically Controlled Assembly of Lanthanide Molecular Complexes of the Heteroditopic Divergent Ligand 4'-(4-Pyridyl)-2,2':6',2″-terpyridine N-Oxide in Hypodentate or Bridging Coordination Modes. Structural, Magnetic, and Photoluminescence Studies. Inorg Chem 2021; 61:265-278. [PMID: 34904436 DOI: 10.1021/acs.inorgchem.1c02809] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Mononuclear rare-earth tris-β-diketonato complexes RE(tta)3dme [RE = Y (1), La (2), Dy (3), or Eu (4); Htta = 2-thenoylacetone; dme = 1,2-dimethoxyethane] react cleanly at room temperature in a 1:1 molar ratio with the heteroditopic divergent ligand 4'-(4-pyridyl)-2,2':6',2″-terpyridine N-oxide (pyterpyNO) to yield RE2(tta)6(pyterpyNO)n, where n = 2 for RE = Y (5), Dy (6), or Eu (7) and n = 3 for RE = La (8). The crystal structure of 5 revealed a dinuclear compound with two pyterpyNO's bridging through the oxygen atom in a hypodentate mode leaving the terpyridine moieties uncoordinated. Using a metal:pyterpyNO molar ratio of 2 for RE = Y (9), Dy (10), or Eu (11), it was possible to isolate the molecular complexes RE4(tta)12(pyterpyNO)2, while using a 5:3 molar ratio, the product La5(tta)12(pyterpyNO)3 (12) can be obtained. 89Y nuclear magnetic resonance spectroscopy revealed two different yttrium centers at room temperature for 9. An X-ray diffraction study of 10 showed a symmetrical tetranuclear structure resulting from the coordination of two Dy(tta)3 fragments to the two hypodentate terpyridines of the dinuclear unit and presenting two different coordination sites for metals with coordination numbers of 8 and 9. Magnetic studies of 6 and 10 revealed the presence of an antiferromagnetic interaction between the two Dy(III) atoms bound by the NO bridges. These compounds displayed a slow relaxing magnetization through Orbach (6) and Raman (10) processes in the absence of an applied magnetic field; the rate increased upon application of a 1 kOe field. 7 and 11 showed a bright red emission typical of Eu3+. The two complexes have similar emission properties mainly determined by the employed β-diketonato ligands.
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Affiliation(s)
- Lorenzo Fioravanti
- Dipartimento di Chimica e Chimica Industriale and CIRCC, Università di Pisa, via Giuseppe Moruzzi 13, I-56124 Pisa, Italy
| | - Luca Bellucci
- Dipartimento di Scienze Chimiche, Università di Padova, via Marzolo 1, I-35131 Padova, Italy.,CNR ICMATE and INSTM, Dipartimento di Scienze Chimiche, Università di Padova, via Marzolo 1, I-35131 Padova, Italy
| | - Lidia Armelao
- Dipartimento di Scienze Chimiche e Tecnologie dei Materiali (DSCTM), Consiglio Nazionale delle Ricerche, Piazzale A. Moro 7, 00185 Roma, Italy.,Dipartimento di Scienze Chimiche and INSTM, Università di Padova, 1-35131 Padova, Italy
| | - Gregorio Bottaro
- CNR ICMATE and INSTM, Dipartimento di Scienze Chimiche, Università di Padova, via Marzolo 1, I-35131 Padova, Italy
| | - Fabio Marchetti
- Dipartimento di Chimica e Chimica Industriale and CIRCC, Università di Pisa, via Giuseppe Moruzzi 13, I-56124 Pisa, Italy
| | - Francesco Pineider
- Dipartimento di Chimica e Chimica Industriale and CIRCC, Università di Pisa, via Giuseppe Moruzzi 13, I-56124 Pisa, Italy
| | - Giordano Poneti
- Instituto de Química, Universidade Federal do Rio de Janeiro, Avenida Athos da Silveira Ramos, 149, Centro de Tecnologia-Cidade Universitária, 21941-909 Rio de Janeiro, Brazil
| | - Simona Samaritani
- Dipartimento di Chimica e Chimica Industriale and CIRCC, Università di Pisa, via Giuseppe Moruzzi 13, I-56124 Pisa, Italy
| | - Luca Labella
- Dipartimento di Chimica e Chimica Industriale and CIRCC, Università di Pisa, via Giuseppe Moruzzi 13, I-56124 Pisa, Italy.,CNR ICMATE and INSTM, Dipartimento di Scienze Chimiche, Università di Padova, via Marzolo 1, I-35131 Padova, Italy
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18
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Starikov AG, Starikova AA, Chegerev MG, Aldoshin SM, Metelitsa AV, Minkin VI. Spin‐State‐Switching Rearrangements of Bis(dioxolene)‐Bridged CrCo Complexes: A DFT Study. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Andrey G. Starikov
- Institute of Physical and Organic Chemistry Southern Federal University 194/2 Stachka Avenue 344090 Rostov-on-Don Russian Federation
| | - Alyona A. Starikova
- Institute of Physical and Organic Chemistry Southern Federal University 194/2 Stachka Avenue 344090 Rostov-on-Don Russian Federation
| | - Maxim G. Chegerev
- Institute of Physical and Organic Chemistry Southern Federal University 194/2 Stachka Avenue 344090 Rostov-on-Don Russian Federation
| | - Sergey M. Aldoshin
- Institute of Problems of Chemical Physics Russian Academy of Sciences 1 Acad. Semenov Avenue 142432 Chernogolovka Russian Federation
| | - Anatoly V. Metelitsa
- Institute of Physical and Organic Chemistry Southern Federal University 194/2 Stachka Avenue 344090 Rostov-on-Don Russian Federation
| | - Vladimir I. Minkin
- Institute of Physical and Organic Chemistry Southern Federal University 194/2 Stachka Avenue 344090 Rostov-on-Don Russian Federation
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19
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Lu YL, Lan WL, Shi W, Jin QH, Cheng P. Photo-induced variation of magnetism in coordination polymers with ligand-based electron transfer. Dalton Trans 2021; 50:13124-13137. [PMID: 34581367 DOI: 10.1039/d1dt01963e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photo-induced variation of magnetism from ligand-based electron transfer has been extensively studied because of its potential applications in magneto-optical memory devices, light-responsive switches, and high-density information storage materials. In this review, we discussed the progress in the photo-induced variation of magnetism in coordination polymers with ligand-to-metal charge transfer (LMCT), ligand-to-ligand charge transfer (LLCT) and internal ligand charge transfer (ILCT), which provides fundamentals for the rational design of multi-functional materials. We also discussed the design and synthetic strategy of such molecule-based materials and gave views on the current challenges and growth trends in this field.
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Affiliation(s)
- Yan-Lei Lu
- Department of Chemistry, Capital Normal University, Beijing 100048, China.
| | - Wen-Long Lan
- Department of Chemistry and Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of Chemistry, Nankai University, Tianjin 300071, China.
| | - Wei Shi
- Department of Chemistry and Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of Chemistry, Nankai University, Tianjin 300071, China.
| | - Qiong-Hua Jin
- Department of Chemistry, Capital Normal University, Beijing 100048, China.
| | - Peng Cheng
- Department of Chemistry and Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of Chemistry, Nankai University, Tianjin 300071, China.
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20
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Janetzki JT, Zahir FZM, Gable RW, Phonsri W, Murray KS, Goerigk L, Boskovic C. A Convenient DFT-Based Strategy for Predicting Transition Temperatures of Valence Tautomeric Molecular Switches. Inorg Chem 2021; 60:14475-14487. [PMID: 34494829 DOI: 10.1021/acs.inorgchem.1c02273] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The ability to identify promising candidate switchable molecules computationally, prior to synthesis, represents a considerable advance in the development of switchable molecular materials. Even more useful would be the possibility of predicting the switching temperature. Cobalt-dioxolene complexes can exhibit thermally induced valence tautomeric switching between low-spin CoIII-catecholate and high-spin CoII-semiquinonate forms, where the half-temperature (T1/2) is the temperature at which there are equal amounts of the two tautomers. We report the first simple computational strategy for accurately predicting T1/2 values for valence tautomeric complexes. Dispersion-corrected density functional theory (DFT) methods have been applied to the [Co(dbdiox)(dbsq)(N2L)] (dbdiox/dbsq•- = 3,5-di-tert-butyldioxolene/semiquinonate; N2L = diimine) family of valence tautomeric complexes, including the newly reported [Co(dbdiox)(dbsq)(MeO-bpy)] (1) (MeO-bpy = 4,4'-dimethoxy-2,2'-bipyridine). The DFT strategy has been thoroughly benchmarked to experimental data, affording highly accurate spin-distributions and an excellent energy match between experimental and calculated spin-states. Detailed orbital analysis of the [Co(dbdiox)(dbsq)(N2L)] complexes has revealed that the diimine ligand tunes the T1/2 value primarily through π-acceptance. We have established an excellent correlation between experimental T1/2(toluene) values for [Co(dbdiox)(dbsq)(N2L)] complexes and the calculated lowest unoccupied molecular orbital energy of the corresponding diimine ligand. The model affords accurate T1/2(toluene) values for [Co(dbdiox)(dbsq)(N2L)] complexes, with an average error of only 3.7%. This quantitative and simple DFT strategy allows experimentalists to not only rapidly identify proposed VT complexes but also predict the transition temperature. This study lays the groundwork for future in silico screening of candidate switchable molecules prior to experimental investigation, with associated time, cost, and environmental benefits.
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Affiliation(s)
- Jett T Janetzki
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
| | - F Zahra M Zahir
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
| | - Robert W Gable
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
| | - Wasinee Phonsri
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Keith S Murray
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Lars Goerigk
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
| | - Colette Boskovic
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
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21
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Chegerev MG, Starikov AG, Starikova AA. Quantum Chemical Study of Spin Transitions in the Bimetallic Fe/Co Complexes with the Bis(catecholate) Bridging Ligand. RUSS J COORD CHEM+ 2021. [DOI: 10.1134/s1070328421090013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Abstract
The computational modeling of the spatial and electronic structures, energy characteristics, and magnetic properties of the bimetallic iron and cobalt complexes with 9,10-dimethyl-9,10-ethano-9,10-dihydro-2,3,6,7-tetrahydroxyanthracene and terminal tris(2-pyridylmethyl)amine bases is performed using the density functional theory method (DFT UTPSSh/6-311++G(d,p)). The chosen tetradentate redox ligand is shown to be a promising precursor for the production of magnetically active compounds. The calculations make it possible to establish a relationship between the relative energies of the electronic isomers of the complexes and the structures of the ancillary N-donor moieties. The coordination compounds prone to the manifestation of spin transitions accompanied by a change in the magnetic properties are revealed.
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22
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Bonanno NM, Watts Z, Mauws C, Patrick BO, Wiebe CR, Shibano Y, Sugisaki K, Matsuoka H, Shiomi D, Sato K, Takui T, Lemaire MT. Valence tautomerism in a [2 × 2] Co 4 grid complex containing a ditopic arylazo ligand. Chem Commun (Camb) 2021; 57:6213-6216. [PMID: 34059865 DOI: 10.1039/d1cc01991k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We describe the structural and magnetic properties of a tetranuclear [2 × 2] Co4 grid complex containing a ditopic arylazo ligand. At low temperatures and in solution the complex is comprised of Co3+ and singly reduced trianion-radical ligands. In the solid state we demonstrate the presence of valence tautomerization via variable temperature magnetic susceptibility experiments and powder-pattern EPR spectroscopy. Valence tautomerism in polynuclear complexes is very rare and to our knowledge is unprecedented in [2 × 2] grid complexes.
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Affiliation(s)
- Nico M Bonanno
- Department of Chemistry, Brock University, St. Catharines, ON L2S 3A1, Canada.
| | - Zackery Watts
- Department of Chemistry, Brock University, St. Catharines, ON L2S 3A1, Canada.
| | - Cole Mauws
- Department of Chemistry, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | - Brian O Patrick
- Department of Chemistry, University of British of Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Christopher R Wiebe
- Department of Chemistry, University of Manitoba, Winnipeg, MB R3T 2N2, Canada and Department of Chemistry, University of Winnipeg, Winnipeg, MB R3B 2E9, Canada
| | - Yuki Shibano
- Department of Chemistry and Molecular Materials Science, Graduate School of Science, Osaka City University, Osaka 558 8585, Japan
| | - Kenji Sugisaki
- Department of Chemistry and Molecular Materials Science, Graduate School of Science, Osaka City University, Osaka 558 8585, Japan
| | - Hideto Matsuoka
- Department of Chemistry and Molecular Materials Science, Graduate School of Science, Osaka City University, Osaka 558 8585, Japan
| | - Daisuke Shiomi
- Department of Chemistry and Molecular Materials Science, Graduate School of Science, Osaka City University, Osaka 558 8585, Japan
| | - Kazunobu Sato
- Department of Chemistry and Molecular Materials Science, Graduate School of Science, Osaka City University, Osaka 558 8585, Japan
| | - Takeji Takui
- Department of Chemistry and Molecular Materials Science, Graduate School of Science, Osaka City University, Osaka 558 8585, Japan
| | - Martin T Lemaire
- Department of Chemistry, Brock University, St. Catharines, ON L2S 3A1, Canada.
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23
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Chegerev MG, Starikova AA. Electronic Lability of Quinonoid‐Bridged Dinuclear 3 d‐Metal Complexes with Tetradentate N‐Donor Bases. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100200] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Maxim G. Chegerev
- Institute of Physical and Organic Chemistry Southern Federal University 194/2 Stachka Avenue 344090 Rostov-on-Don Russian Federation
| | - Alyona A. Starikova
- Institute of Physical and Organic Chemistry Southern Federal University 194/2 Stachka Avenue 344090 Rostov-on-Don Russian Federation
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24
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Guda AA, Chegerev M, Starikov AG, Vlasenko VG, Zolotukhin AA, Bubnov MP, Cherkasov VK, Shapovalov VV, Rusalev YV, Tereshchenko AA, Trigub AL, Chernyshev AV, Soldatov AV. Valence tautomeric transition of bis(o-dioxolene) cobalt complex in solid state and solution. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:215405. [PMID: 33588394 DOI: 10.1088/1361-648x/abe650] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 02/15/2021] [Indexed: 06/12/2023]
Abstract
Valence tautomer transition occurs mainly in 3d metalorganic complexes with redox-active ligands and makes them potential candidates for single-molecular switches. The transition occurs under temperature, pressure, or light-induced stimuli and is strongly affected by the intermolecular interactions. However single-crystal x-ray diffraction is not always applicable to such systems when crystal structure is destroyed upon transition or system is studied in the solution. Such an example is bis(o-semiquinonato) cobalt complex with TEMPO-functionalized iminopyridine ancillary ligand. In this work we apply two complementary techniques-ligand-sensitive Fourier transform infrared spectroscopy (FTIR) and metal sensitive Co K-edge x-ray absorption spectroscopy (XAS). In a solid state, a temperature hysteresis of magnetization larger than 40 K was observed upon cyclic cooling-heating. So, the temperature of phase transition upon cooling is about 40 K lower than that upon heating. In solution, the x-ray absorption spectra for high-temperature and low-temperature states were similar to that in the solid form, but the hysteresis was absent. Two methods are can probe valence tautomer transition, but XAS has an advantage for the liquid phase analysis and FTIR has larger sensitivity to the ligand related interactions in solid.
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Affiliation(s)
- A A Guda
- The Smart Materials Research Institute, Sladkova 178/24, 344090 Rostov-on-Don, Russia
| | - M Chegerev
- Institute of Physical and Organic Chemistry, Southern Federal University, Stachki Avenue, 194/2, 344090, Rostov-on-Don, Russia
| | - A G Starikov
- Institute of Physical and Organic Chemistry, Southern Federal University, Stachki Avenue, 194/2, 344090, Rostov-on-Don, Russia
| | - V G Vlasenko
- Institute of Physics, Southern Federal University, Stachki Avenue, 194, 344090, Rostov-on-Don, Russia
| | - A A Zolotukhin
- G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 49 Tropinina Str., GSP-445, 603950 Nizhny Novgorod, Russia
| | - M P Bubnov
- G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 49 Tropinina Str., GSP-445, 603950 Nizhny Novgorod, Russia
| | - V K Cherkasov
- G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 49 Tropinina Str., GSP-445, 603950 Nizhny Novgorod, Russia
| | - V V Shapovalov
- The Smart Materials Research Institute, Sladkova 178/24, 344090 Rostov-on-Don, Russia
| | - Yu V Rusalev
- The Smart Materials Research Institute, Sladkova 178/24, 344090 Rostov-on-Don, Russia
| | - A A Tereshchenko
- The Smart Materials Research Institute, Sladkova 178/24, 344090 Rostov-on-Don, Russia
| | - A L Trigub
- National Research Center 'Kurchatov Institute', 1 Akademika Kurchatova pl., 123098 Moscow, Russia
| | - A V Chernyshev
- Institute of Physical and Organic Chemistry, Southern Federal University, Stachki Avenue, 194/2, 344090, Rostov-on-Don, Russia
| | - A V Soldatov
- The Smart Materials Research Institute, Sladkova 178/24, 344090 Rostov-on-Don, Russia
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25
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Singh A, Panda S, Dey S, Lahiri GK. Metal‐to‐Ligand Charge Transfer Induced Valence Tautomeric Forms of Non‐Innocent 2,2′‐Azobis(benzothiazole) in Ruthenium Frameworks. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202100979] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Aditi Singh
- Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Sanjib Panda
- Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Sanchaita Dey
- Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Goutam Kumar Lahiri
- Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400076 India
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26
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Singh A, Panda S, Dey S, Lahiri GK. Metal‐to‐Ligand Charge Transfer Induced Valence Tautomeric Forms of Non‐Innocent 2,2′‐Azobis(benzothiazole) in Ruthenium Frameworks. Angew Chem Int Ed Engl 2021; 60:11206-11210. [DOI: 10.1002/anie.202100979] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 02/25/2021] [Indexed: 11/11/2022]
Affiliation(s)
- Aditi Singh
- Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Sanjib Panda
- Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Sanchaita Dey
- Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Goutam Kumar Lahiri
- Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400076 India
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27
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Starikov AG, Chegerev MG, Starikova AA, Minkin VI. Computational modeling of cobalt diketonate adducts with o-benzoquinones incorporating organosilicon radicals. Russ Chem Bull 2021. [DOI: 10.1007/s11172-021-3086-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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28
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Nadurata VL, Boskovic C. Switching metal complexes via intramolecular electron transfer: connections with solvatochromism. Inorg Chem Front 2021. [DOI: 10.1039/d0qi01490g] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Solvent-induced color-changing phenomena exhibited by some metal complexes can illuminate key aspects of their switchable behavior.
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29
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Starikova AA, Chegerev MG, Starikov AG. Computational insight into magnetic behaviour of cobalt tris(2-pyridylmethyl)amine complexes with dioxolenes incorporating stable radicals. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2020.138128] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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30
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Suenaga Y, Mibu T, Okubo T, Maekawa M, Kuroda-Sowa T, Sugimoto K. Dinuclear cobalt complexes with a redox active biphenyl bridging ligand [Co 2(BP)(tqa) 2](PF 6) 2 (H 4BP = 4,4'-bis(3- tert-butyl-1,2-catechol), tqa = tris(2-quinolylmethyl)amine): structure and magnetic properties. Dalton Trans 2021; 50:9833-9841. [PMID: 34190272 DOI: 10.1039/d1dt00995h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The biscatechol, H4BP (4,4'-bis(3-tert-butyl-1,2-catechol)) that can directly connect two redox active catechol moieties was synthesized. Also, tris(2-pyridylmethyl)amine (tpa), bis(2-pyridylmethyl)(2-quinolylmethyl)amine (bpqa), (2-pyridylmethyl)bis(2-quinolyl methyl)amine (pbqa), and tris (2-quinolylmethyl)amine (tqa) were synthesized as terminal ligands of the tetracoordinated tripod. In total, five different dinuclear Co complexes were synthesized from H4BP with various terminal ligands as follows, [Co2(BP)(tpa)2](PF6)2 (1), [Co2(BP)(tpa)2](PF6)3 (2), [Co2(BP)(bpqa)2](PF6)2 (3), [Co2(BP)(pbqa)2](PF6)2 (4), and [Co2(BP)(tqa)2](PF6)2 (5). After a one-electron oxidation reaction of complex (1), complex (2), was isolated as a mixed valence state lsCoIII-[SQ-Cat]-lsCoIII, with an absorption intensity of about 1370 nm (intervalence charge transfer (IVCT) bands) in CH3CN solution. In addition, an investigation of the magnetic properties of the dinuclear Co complex (3) with SQUID showed that the χMT value gradually increased as the temperature increased from 280 to 380 K. Studies in the solid and solution states using electronic spectra, cyclic voltammetry and SQUID for the above complexes provide clear evidence for three different charge distributions: complexes (1) and (3) are CoIII-[Cat-Cat]-CoIII, complex (2) is CoIII-[Sq-Cat]-CoIII, complexes (4) and (5) are CoII-[Sq-Sq]-CoII. Of the five cobalt dinuclear complexes, only complex (3) shows evidence of the temperature dependence of the charge distribution, displaying a thermally induced valence tautomeric transition from the lsCoIII-[Cat-Cat]-lsCoIII to hsCoII-[Sq-Sq]-hsCoII in both solid and solution states. However, this valence tautomeric step is incomplete at 380 K, with the χMT value of hsCoII-[Sq-Sq]-hsCoII. This suggests that the steric hindrance of the quinolyl rings around the Co ion produces a coordination atmosphere that is weaker than that observed with pyridyl rings, which facilitates a change in the CoIII ions to CoII.
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Affiliation(s)
- Yusaku Suenaga
- Department of Science, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
| | - Takuto Mibu
- Department of Science, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
| | - Takashi Okubo
- Department of Science, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan. and Research Institute of Science and Technology, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
| | - Masahiko Maekawa
- Research Institute of Science and Technology, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
| | - Takayoshi Kuroda-Sowa
- Department of Science, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
| | - Kunihisa Sugimoto
- Diffraction & Scattering Division, Japan Synchrotron Radiation Research Institute(JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan and Institute for Integrated Cell-Material Sciences (iCeMS), Institute for Advance Study (KUIAS), Kyoto University, Kyoto, Japan
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31
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Bravin C, Badetti E, Licini G, Zonta C. Tris(2-pyridylmethyl)amines as emerging scaffold in supramolecular chemistry. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213558] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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32
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Ershova IV, Piskunov AV, Cherkasov VK. Complexes of diamagnetic cations with radical anion ligands. RUSSIAN CHEMICAL REVIEWS 2020. [DOI: 10.1070/rcr4957] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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33
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Valence tautomerism and delocalization in transition metal complexes of o-amidophenolates and other redox-active ligands. Some recent results. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213240] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Minkin VI, Starikova AA, Chegerev MG, Starikov AG. Computer Simulation of the Structure and Magnetic Properties of Cobalt Complexes with N-Substituted Pyridinophanes and Radical-Functionalized o-Benzoquinones. RUSS J COORD CHEM+ 2020. [DOI: 10.1134/s1070328420060068] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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35
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Su SQ, Wu SQ, Baker ML, Bencok P, Azuma N, Miyazaki Y, Nakano M, Kang S, Shiota Y, Yoshizawa K, Kanegawa S, Sato O. Quenching and Restoration of Orbital Angular Momentum through a Dynamic Bond in a Cobalt(II) Complex. J Am Chem Soc 2020; 142:11434-11441. [DOI: 10.1021/jacs.0c02257] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Sheng-Qun Su
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Shu-Qi Wu
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Michael L. Baker
- The University of Manchester at Harwell, Didcot, OX11 OFA, United Kingdom
- Department of Chemistry, The University of Manchester, Manchester M139PL, United Kingdom
| | - Peter Bencok
- Diamond Light Source, Science Division, Didcot OX11 0DE, United Kingdom
| | - Nobuaki Azuma
- Research Core for Interdisciplinary Science, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Yuji Miyazaki
- Research Center for Thermal and Entropic Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Motohiro Nakano
- Research Center for Thermal and Entropic Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Soonchul Kang
- Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan
| | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Shinji Kanegawa
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Osamu Sato
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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36
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Zhu XQ, Cao WH, Su SD, Wu XT, Sheng TL. Effects of ligand substituents on the single-molecule magnetic behavior of quinonoid-bridged dicobalt compounds. Dalton Trans 2020; 49:6738-6743. [PMID: 32373806 DOI: 10.1039/d0dt00033g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of quinonoid-bridged dicobalt compounds [(N4Co)2LX](ClO4)2 (1-4) (X = H, Cl, Br and OMe; N4 = 1,4,7,10-tetrabenzyl-1,4,7,10-tetraazacyclododecane) are synthesized and well characterized. Single crystal X-ray diffraction analyses reveal that the coordination geometry of one side Co in compounds 1-4 changes from a triangular prism to distorted octahedron with a change in the bridged-ligand substituent. Magnetic measurements show that compounds 1 and 3 exhibit single-molecule magnetic behavior. Magneto-structural analyses indicate that the difference in the relaxation barrier U between the four compounds results from the different orientations of the anisotropy axes of the two Co centers in the molecule.
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Affiliation(s)
- Xiao-Quan Zhu
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
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37
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Gransbury GK, Livesay BN, Janetzki JT, Hay MA, Gable RW, Shores MP, Starikova A, Boskovic C. Understanding the Origin of One- or Two-Step Valence Tautomeric Transitions in Bis(dioxolene)-Bridged Dinuclear Cobalt Complexes. J Am Chem Soc 2020; 142:10692-10704. [DOI: 10.1021/jacs.0c01073] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Gemma K. Gransbury
- School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
| | - Brooke N. Livesay
- Department of Chemistry, Colorado State University, Fort Collins 80523, United States
| | - Jett T. Janetzki
- School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
| | - Moya A. Hay
- School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
| | - Robert W. Gable
- School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
| | - Matthew P. Shores
- Department of Chemistry, Colorado State University, Fort Collins 80523, United States
| | - Alyona Starikova
- Institute of Physical and Organic Chemistry, Southern Federal University, 344090 Rostov-on-Don, Russian Federation
| | - Colette Boskovic
- School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
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38
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Mibu T, Suenaga Y, Okubo T, Maekawa M, Kuroda-Sowa T. Spectroscopic characterization of valence tautomeric behavior in a cobalt-dioxolene complex using an ancillary ligand containing quinoline groups. INORG CHEM COMMUN 2020. [DOI: 10.1016/j.inoche.2020.107826] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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39
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Chen J, Sekine Y, Okazawa A, Sato H, Kosaka W, Miyasaka H. Chameleonic layered metal-organic frameworks with variable charge-ordered states triggered by temperature and guest molecules. Chem Sci 2020; 11:3610-3618. [PMID: 34094049 PMCID: PMC8152584 DOI: 10.1039/d0sc00684j] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 03/04/2020] [Indexed: 01/05/2023] Open
Abstract
Molecular materials whose electronic states are multiply varied depending on external stimuli are among the most promising targets for the development of multiply accessible molecular switches. Here, we report a honeycomb layer composed of tetraoxolene-bridged iron (Fe) subunits whose charge-ordered states are multiply variable via thermal treatments and solvation/desolvation with the crystallinity intact. The compound is (NPr4)2[Fe2(Cl2An)3] (1-d; NPr4 + = tetra-n-propylammonium; Cl2An2- = 2,5-dichloro-3,6-dihydroxo-1,4-benzoquinonate), which possesses three charge-ordered states: a low-temperature (LT) phase [(Fe3+)2(Cl2An2-)(Cl2An˙3-)2]2-; an intermediate (IM) phase [(Fe2.5+)2(Cl2An2-)(Cl2An2.5-)2]2-; and a high-temperature (HT) phase [(Fe2+)2(Cl2An2-)3]2- that varies according to temperature. In addition, the LT phase of 1-d is reversibly changeable to another IM phase in its solvated compound 1 via a solvation/desolvation process at room temperature. This example demonstrates a new multiple-switching system based on electron transfer and host-guest chemistry in a charge-flexible metal-organic framework.
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Affiliation(s)
- Jian Chen
- Institute for Materials Research, Tohoku University 2-1-1 Katahira, Aoba-ku Sendai 980-8577 Japan
- Department of Chemistry, Graduate School of Science, Tohoku University 6-3 Aramaki-Aza-Aoba, Aoba-ku Sendai 980-8578 Japan
| | - Yoshihiro Sekine
- Institute for Materials Research, Tohoku University 2-1-1 Katahira, Aoba-ku Sendai 980-8577 Japan
- Department of Chemistry, Graduate School of Science, Tohoku University 6-3 Aramaki-Aza-Aoba, Aoba-ku Sendai 980-8578 Japan
| | - Atsushi Okazawa
- Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo 3-8-1 Komaba Meguro-ku Tokyo 153-8902 Japan
| | - Hiroyasu Sato
- Application Laboratory, Rigaku Corporation 3-9-12, Matsubara-cho Akishima-shi Tokyo 196-8666 Japan
| | - Wataru Kosaka
- Institute for Materials Research, Tohoku University 2-1-1 Katahira, Aoba-ku Sendai 980-8577 Japan
- Department of Chemistry, Graduate School of Science, Tohoku University 6-3 Aramaki-Aza-Aoba, Aoba-ku Sendai 980-8578 Japan
| | - Hitoshi Miyasaka
- Institute for Materials Research, Tohoku University 2-1-1 Katahira, Aoba-ku Sendai 980-8577 Japan
- Department of Chemistry, Graduate School of Science, Tohoku University 6-3 Aramaki-Aza-Aoba, Aoba-ku Sendai 980-8578 Japan
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40
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Starikova AA, Chegerev MG, Starikov AG. Computational modeling of structure and magnetic properties of dinuclear di-o-benzoquinone iron complexes with linear polycyclic linkers. Russ Chem Bull 2020. [DOI: 10.1007/s11172-020-2747-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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41
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Heterospin magnetically active bimetallic Fe and Co complexes of aldiminato-functionalized catechol: a DFT study. Struct Chem 2019. [DOI: 10.1007/s11224-019-01463-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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42
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Gransbury GK, Boulon ME, Mole RA, Gable RW, Moubaraki B, Murray KS, Sorace L, Soncini A, Boskovic C. Single-ion anisotropy and exchange coupling in cobalt(ii)-radical complexes: insights from magnetic and ab initio studies. Chem Sci 2019; 10:8855-8871. [PMID: 31803460 PMCID: PMC6853083 DOI: 10.1039/c9sc00914k] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 07/27/2019] [Indexed: 01/18/2023] Open
Abstract
The concurrent effects of single-ion anisotropy and exchange interactions on the electronic structure and magnetization dynamics have been analyzed for a cobalt(ii)-semiquinonate complex. Analogs containing diamagnetic catecholate and tropolonate ligands were employed for comparison of the magnetic behavior and zinc congeners assisted with the spectroscopic characterization and assessment of intermolecular interactions in the cobalt(ii) compounds. Low temperature X-band (ν ≈ 9.4 GHz) and W-Band (ν ≈ 94 GHz) electron paramagnetic resonance spectroscopy and static and dynamic magnetic measurements have been used to elucidate the electronic structure of the high spin cobalt(ii) ion in [Co(Me3tpa)(Br4cat)] (1; Me3tpa = tris[(6-methyl-2-pyridyl)methyl]amine, Br4cat2- = tetrabromocatecholate) and [Co(Me3tpa)(trop)](PF6) (2(PF6); trop- = tropolonate), which show slow relaxation of the magnetization in applied field. The cobalt(ii)-semiquinonate exchange interaction in [Co(Me3tpa)(dbsq)](PF6)·tol (3(PF6)·tol; dbsq- = 3,5-di-tert-butylsemiquinonate, tol = toluene) has been determined using an anisotropic exchange Hamiltonian in conjunction with multistate restricted active space self-consistent field ab initio modeling and wavefunction analysis, with comparison to magnetic and inelastic neutron scattering data. Our results demonstrate dominant ferromagnetic exchange for 3+ that is of similar magnitude to the anisotropy parameters of the cobalt(ii) ion and contains a significant contribution from spin-orbit coupling. The nature of the exchange coupling between octahedral high spin cobalt(ii) and semiquinonate ligands is a longstanding question; answering this question for the specific case of 3+ has confirmed the considerable sensitivity of the exchange to the molecular structure. The methodology employed will be generally applicable for elucidating exchange coupling between orbitally-degenerate metal ions and radical ligands and relevant to the development of bistable molecules and their integration into devices.
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Affiliation(s)
- Gemma K Gransbury
- School of Chemistry , University of Melbourne , Parkville , Victoria 3010 , Australia .
| | - Marie-Emmanuelle Boulon
- UdR INSTM , Department of Chemistry "U. Schiff" , University of Florence , 50019 Sesto Fiorentino (FI) , Italy
| | - Richard A Mole
- Australian Nuclear Science and Technology Organisation , Locked Bag 2001 , Kirrawee DC , New South Wales 2232 , Australia
| | - Robert W Gable
- School of Chemistry , University of Melbourne , Parkville , Victoria 3010 , Australia .
| | - Boujemaa Moubaraki
- School of Chemistry , Monash University , Clayton , Victoria 3800 , Australia
| | - Keith S Murray
- School of Chemistry , Monash University , Clayton , Victoria 3800 , Australia
| | - Lorenzo Sorace
- UdR INSTM , Department of Chemistry "U. Schiff" , University of Florence , 50019 Sesto Fiorentino (FI) , Italy
| | - Alessandro Soncini
- School of Chemistry , University of Melbourne , Parkville , Victoria 3010 , Australia .
| | - Colette Boskovic
- School of Chemistry , University of Melbourne , Parkville , Victoria 3010 , Australia .
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Suenaga Y, Mibu T, Okubo T, Maekawa M, Kuroda-Sowa T. Syntheses, structure and properties of dinuclear Co complexes with bis(catecholate) ligands – Effect of a quinoline ring in the terminal group. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.07.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Sinitsa DK, Sukhikh TS, Petrov PA, Nadolinny VA, Konchenko SN, Pushkarevsky NA. Structural Diversity of Calcium, Strontium, and Barium Complexes with Reduced Forms of the 3,6‐Di‐
tert
‐butyl‐o‐benzoquinone Ligand. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900678] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Dmitry K. Sinitsa
- Nikolaev Institut of Inorganic Chemistry SB RAS Akademika Lavrentieva ave. 3 630090 Novosibirsk Russia
- Department of Natural Sciences Novosibirsk State University Pirogova st. 1 630090 Novosibirsk Russia
| | - Taisiya S. Sukhikh
- Nikolaev Institut of Inorganic Chemistry SB RAS Akademika Lavrentieva ave. 3 630090 Novosibirsk Russia
- Department of Natural Sciences Novosibirsk State University Pirogova st. 1 630090 Novosibirsk Russia
| | - Pavel A. Petrov
- Nikolaev Institut of Inorganic Chemistry SB RAS Akademika Lavrentieva ave. 3 630090 Novosibirsk Russia
- Department of Natural Sciences Novosibirsk State University Pirogova st. 1 630090 Novosibirsk Russia
| | - Vladimir A. Nadolinny
- Nikolaev Institut of Inorganic Chemistry SB RAS Akademika Lavrentieva ave. 3 630090 Novosibirsk Russia
| | - Sergey N. Konchenko
- Nikolaev Institut of Inorganic Chemistry SB RAS Akademika Lavrentieva ave. 3 630090 Novosibirsk Russia
- Department of Natural Sciences Novosibirsk State University Pirogova st. 1 630090 Novosibirsk Russia
| | - Nikolay A. Pushkarevsky
- Nikolaev Institut of Inorganic Chemistry SB RAS Akademika Lavrentieva ave. 3 630090 Novosibirsk Russia
- Department of Natural Sciences Novosibirsk State University Pirogova st. 1 630090 Novosibirsk Russia
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45
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Li B, Zhao YM, Kirchon A, Pang JD, Yang XY, Zhuang GL, Zhou HC. Unconventional Method for Fabricating Valence Tautomeric Materials: Integrating Redox Center within a Metal-Organic Framework. J Am Chem Soc 2019; 141:6822-6826. [PMID: 30986355 DOI: 10.1021/jacs.9b02375] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Due to the structural advantages displayed by Metal-Organic Frameworks (MOFs), integrating Valence Tautomerism (VT) systems within MOFs could be an effective strategy in order to break through the constraints of the traditional ones. Herein, we report the first successful integration of a VT system into a MOF termed VT-MOF-1. The structural characteristics of VT-MOF-1, such as dinuclear cobalt-catechol clusters and solvent-accessible pores, are both innovative and novel, potentially yielding new vitality within VT field. In addition, VT-MOF-1 exhibits specific behaviors responsive to temperature and different solvent molecules as n-butanol, tert-butanol, and isopropyl alcohol. The entropy values and configurations of the solvent molecules might be responsible for the tunable sensing behaviors.
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Affiliation(s)
- Bao Li
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, School of Chemistry and Chemical Engineering , Huazhong University of Science and Technology , Wuhan , Hubei 430074 , People's Republic of China.,Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States
| | - Yu-Meng Zhao
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, School of Chemistry and Chemical Engineering , Huazhong University of Science and Technology , Wuhan , Hubei 430074 , People's Republic of China
| | - Angelo Kirchon
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States
| | - Jian-Dong Pang
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States
| | - Xin-Yu Yang
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States
| | - Gui-Lin Zhuang
- Institute of Industrial Catalysis, College of Chemical Engineering , Zhejiang University of Technology , Zhejiang 310023 , People's Republic of China
| | - Hong-Cai Zhou
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States.,Department of Materials Science and Engineering , Texas A&M University , College Station , Texas 77842 , United States
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46
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Gransbury GK, Boulon ME, Petrie S, Gable RW, Mulder RJ, Sorace L, Stranger R, Boskovic C. DFT Prediction and Experimental Investigation of Valence Tautomerism in Cobalt-Dioxolene Complexes. Inorg Chem 2019; 58:4230-4243. [DOI: 10.1021/acs.inorgchem.8b03291] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Gemma K. Gransbury
- School of Chemistry, University of Melbourne, Melbourne, VIC 3010, Australia
| | - Marie-Emmanuelle Boulon
- UdR INSTM and Department of Chemistry “U. Schiff”, University of Florence, 50019 Sesto Fiorentino, FI, Italy
| | - Simon Petrie
- Research School of Chemistry, College of Physical & Mathematical Sciences, Australian National University, Canberra, ACT 2601, Australia
| | - Robert W. Gable
- School of Chemistry, University of Melbourne, Melbourne, VIC 3010, Australia
| | | | - Lorenzo Sorace
- UdR INSTM and Department of Chemistry “U. Schiff”, University of Florence, 50019 Sesto Fiorentino, FI, Italy
| | - Robert Stranger
- Research School of Chemistry, College of Physical & Mathematical Sciences, Australian National University, Canberra, ACT 2601, Australia
| | - Colette Boskovic
- School of Chemistry, University of Melbourne, Melbourne, VIC 3010, Australia
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47
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Greatorex S, Vincent KB, Baldansuren A, McInnes EJL, Patmore NJ, Sproules S, Halcrow MA. Rigidification of a macrocyclic tris-catecholate scaffold leads to electronic localisation of its mixed valent redox product. Chem Commun (Camb) 2019; 55:2281-2284. [DOI: 10.1039/c8cc10122a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
One-electron oxidation of the compound shown shows no evidence for intervalence charge transfer in the macrocylic ligand radical product. In contrast, related [{Pt(L)}3(μ3-ctc˙)]+ (H6ctc = cyclotricatechylene), exhibits class II mixed valency.
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Affiliation(s)
- Sam Greatorex
- School of Chemistry
- University of Leeds
- Leeds LS2 9JT
- UK
| | - Kevin B. Vincent
- Department of Chemical Sciences
- University of Huddersfield
- Huddersfield HD1 3DH
- UK
| | | | - Eric J. L. McInnes
- School of Chemistry and Photon Science Institute
- University of Manchester
- Manchester M13 9PL
- UK
| | - Nathan J. Patmore
- Department of Chemical Sciences
- University of Huddersfield
- Huddersfield HD1 3DH
- UK
| | - Stephen Sproules
- WestCHEM, School of Chemistry
- University of Glasgow
- Glasgow G12 8QQ
- UK
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48
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Tezgerevska T, Rousset E, Gable RW, Jameson GNL, Sañudo EC, Starikova A, Boskovic C. Valence tautomerism and spin crossover in pyridinophane–cobalt–dioxolene complexes: an experimental and computational study. Dalton Trans 2019; 48:11674-11689. [DOI: 10.1039/c9dt02372k] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Variation of alkyl substituents on pyridinophane ancillary ligands governs temperature-dependent valence tautomeric or spin crossover equilibria in a family of cobalt–dioxolene complexes.
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Affiliation(s)
| | - Elodie Rousset
- School of Chemistry
- University of Melbourne
- Melbourne
- Australia
| | - Robert W. Gable
- School of Chemistry
- University of Melbourne
- Melbourne
- Australia
| | | | - E. Carolina Sañudo
- Departament de Química Inorgànica i Orgànica
- Universitat de Barcelona
- 08028 Barcelona
- Spain
- Institut de Nanociència i Nanotecnologia
| | - Alyona Starikova
- Institute of Physical and Organic Chemistry
- Southern Federal University
- 344090 Rostov on Don
- Russian Federation
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49
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Minkin VI, Starikov AG, Starikova AA, Minyaev RM, Boldyrev AI. The structurally variable network of spin couplings and migrating paramagnetic centers in binuclear o-quinone Co II complexes with biradical acene linkers: a computational DFT study. Dalton Trans 2018; 47:15948-15956. [PMID: 30378605 DOI: 10.1039/c8dt02925c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of new magnetically-active coordination compounds comprising binuclear mixed-ligand complexes of cobalt bis-diketonates with acene linkers functionalized by two redox-active o-quinone moieties has been designed by means of density functional theory (DFT UB3LYP*/6-311++G(d,p)) calculations of their electronic structure, energy characteristics and magnetic properties. Two types of redox-active ligands include those with an acene linker bridging two o-benzoquinone fragments and the ligands containing an integrated π-conjugated system formed by annulation of o-quinone rings to the polycyclic core. The calculations reveal the dependence of spin density distribution in the compounds under study on the type of ligand. The considered binuclear CoII diketonate adducts manifest the capability of undergoing one- and two-step spin transitions induced by intramolecular electron transfers between the metal ions and the ligand system. An increase in the number of condensed rings of the acene linker promotes the stabilization of the biradicaloid state of the linker and enhances exchange interactions between all paramagnetic centers of the complexes giving rise to the formation of a flexible spin coupling network. The predicted unusual magnetic properties make the binuclear cobalt complexes with di-o-quinone ligand containing acene linker groups the promising building blocks for molecular electronic and spintronic devices.
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Affiliation(s)
- Vladimir I Minkin
- Institute of Physical and Organic Chemistry at Southern Federal University, Stachka Avenue 194/2, Rostov-on-Don, Russia.
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50
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Starikova AA, Minkin VI. Adducts of transition metal complexes with redox-active ligands: the structure and spin-state-switching rearrangements. RUSSIAN CHEMICAL REVIEWS 2018. [DOI: 10.1070/rcr4837] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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