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Gupta SK, Rao SV, Demeshko S, Dechert S, Bill E, Atanasov M, Neese F, Meyer F. Air-stable four-coordinate cobalt(ii) single-ion magnets: experimental and ab initio ligand field analyses of correlations between dihedral angles and magnetic anisotropy. Chem Sci 2023; 14:6355-6374. [PMID: 37325133 PMCID: PMC10266464 DOI: 10.1039/d3sc00813d] [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: 02/13/2023] [Accepted: 05/12/2023] [Indexed: 06/17/2023] Open
Abstract
For single-ion magnets (SIMs), understanding the effects of the local coordination environment and ligand field on magnetic anisotropy is key to controlling their magnetic properties. Here we present a series of tetracoordinate cobalt(ii) complexes of the general formula [FL2Co]X2 (where FL is a bidentate diamido ligand) whose electron-withdrawing -C6F5 substituents confer stability under ambient conditions. Depending on the cations X, these complexes adopt structures with greatly varying dihedral twist angle δ between the N-Co-N' chelate planes in the solid state (48.0 to 89.2°). AC and DC field magnetic susceptibility measurements show this to translate into very different magnetic properties, the axial zero-field splitting (ZFS) parameter D ranging from -69 cm-1 to -143 cm-1 with substantial or negligible rhombic component E, respectively. A close to orthogonal arrangement of the two N,N'-chelating σ- and π-donor ligands at the Co(ii) ion is found to raise the energy barrier for magnetic relaxation to above 400 K. Multireference ab initio methods were employed to describe the complexes' electronic structures, and the results were analyzed within the framework of ab initio ligand field theory to probe the nature of the metal-ligand bonding and spin-orbit coupling. A relationship between the energy gaps of the first few electronic transitions and the ZFS was established, and the ZFS was correlated with the dihedral angle δ as well as with the metal-ligand bonding variations, viz. the two angular overlap parameters eσ and eπs. These findings not only give rise to a Co(ii) SIM showing open hysteresis up to 3.5 K at a sweep rate of 30 Oe s-1, but they also provide design guidelines for Co(ii) complexes with favorable SIM signatures or even switchable magnetic relaxation properties.
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Affiliation(s)
- Sandeep K Gupta
- Institut für Anorganische Chemie, Universität Göttingen Tammannstrasse 4 37077 Göttingen Germany
| | - Shashank V Rao
- Max Planck Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
| | - Serhiy Demeshko
- Institut für Anorganische Chemie, Universität Göttingen Tammannstrasse 4 37077 Göttingen Germany
| | - Sebastian Dechert
- Institut für Anorganische Chemie, Universität Göttingen Tammannstrasse 4 37077 Göttingen Germany
| | - Eckhard Bill
- Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34-36 45470 Mülheim an der Ruhr Germany
| | - Mihail Atanasov
- Max Planck Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences Akad. Georgi Bontchev Street 11 1113 Sofia Bulgaria
| | - Frank Neese
- Max Planck Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
| | - Franc Meyer
- Institut für Anorganische Chemie, Universität Göttingen Tammannstrasse 4 37077 Göttingen Germany
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2
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Pohle MH, Böhme M, Lohmiller T, Ziegenbalg S, Blechschmidt L, Görls H, Schnegg A, Plass W. Magnetic Anisotropy and Relaxation of Pseudotetrahedral [N 2 O 2 ] Bis-Chelate Cobalt(II) Single-Ion Magnets Controlled by Dihedral Twist Through Solvomorphism. Chemistry 2023; 29:e202202966. [PMID: 36468847 DOI: 10.1002/chem.202202966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 12/04/2022] [Accepted: 12/05/2022] [Indexed: 12/07/2022]
Abstract
The methanol solvomorph 1 ⋅ 2MeOH of the cobalt(II) complex [Co(LSal,2-Ph )2 ] (1) with the sterically demanding Schiff-base ligand 2-(([1,1'-biphenyl]-2-ylimino)methyl)phenol (HLSal,2-Ph ) shows the thus far largest dihedral twist distortion between the two chelate planes compared to an ideal pseudotetrahedral arrangement. The cobalt(II) ion in 1 ⋅ 2MeOH exhibits an easy-axis anisotropy leading to a spin-reversal barrier of 55.3 cm-1 , which corresponds to an increase of about 17 % induced by the larger dihedral twist compared to the solvent-free complex 1. The magnetic relaxation for 1 ⋅ 2MeOH is significantly slower compared to 1. An in-depth frequency-domain Fourier-transform (FD-FT) THz-EPR study not only allowed the direct measurement of the magnetic transition between the two lowest Kramers doublets for the cobalt(II) complexes, but also revealed the presence of spin-phonon coupling. Interestingly, a similar dihedral twist correlation is also observed for a second pair of cobalt(II)-based solvomorphs, which could be benchmarked by FD-FT THz-EPR.
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Affiliation(s)
- Maximilian H Pohle
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstraße 8, 07743, Jena, Germany
| | - Michael Böhme
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstraße 8, 07743, Jena, Germany
| | - Thomas Lohmiller
- EPR4Energy Joint Lab, Department Spins in Energy Conversion and Quantum Information Science, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 16, 12489, Berlin, Germany.,present address: Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489, Berlin, Germany
| | - Sven Ziegenbalg
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstraße 8, 07743, Jena, Germany
| | - Louis Blechschmidt
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstraße 8, 07743, Jena, Germany
| | - Helmar Görls
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstraße 8, 07743, Jena, Germany
| | - Alexander Schnegg
- EPR4Energy Joint Lab, Department Spins in Energy Conversion and Quantum Information Science, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 16, 12489, Berlin, Germany.,EPR Research Group, MPI for Chemical Energy Conversion, Stiftstr. 34-36, 45470, Mülheim an der Ruhr, Germany
| | - Winfried Plass
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstraße 8, 07743, Jena, Germany
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3
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Akhtar R, Kaulage SH, Sangole MP, Tothadi S, Parvathy P, Parameswaran P, Singh K, Khan S. First-Row Transition Metal Complexes of a Phosphine-Silylene-Based Hybrid Ligand. Inorg Chem 2022; 61:13330-13341. [PMID: 35969438 DOI: 10.1021/acs.inorgchem.2c01233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have prepared two new silylene-phosphine-based hybrid ligands Si{N(R)C6H4(PPh2)}{PhC(NtBu)2} [R = TMS {trimethylsilyl} (1) and TBDMS {tert-butyldimethylsilyl} (2)], which possess two donor sites. Furthermore, the treatment of the bidentate ligand 1 with base metal halides {FeBr2, CoBr2, NiCl2·dme [nickel chloride(II) ethylene glycol dimethyl ether]} and 2 with NiBr2·dme [nickel bromide(II) ethylene glycol dimethyl ether] afforded four-coordinate six-membered metal complexes 3-6, respectively, which feature coordination from both Si(II) and P(III) sites. Subsequently, complexes 3 [(FeBr2)Si{N(SiMe3)C6H4(PPh2)}{PhC(NtBu)2}], 4 [(CoBr2)Si{N(SiMe3)C6H4(PPh2)}{PhC(NtBu)2}], 5 [(NiCl2)Si{N(SiMe3)C6H4(PPh2)}{PhC(NtBu)2}], and 6 [(NiBr2)Si{N(SitBuMe2)C6H4(PPh2)}{PhC(NtBu)2}] are studied for their redox and magnetic properties with the help of UV-vis spectroscopy, cyclic voltammetry, SQUID magnetometry, and theoretical calculations. Complexes 3-6 were found to display a paramagnetic behavior. All the compounds are well established by single-crystal X-ray diffraction studies.
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Affiliation(s)
- Ruksana Akhtar
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
| | - Sandeep H Kaulage
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
| | - Mayur P Sangole
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, Uttar Pradesh, India
| | - Srinu Tothadi
- CSIR-Central Salt and Marine Chemicals Research Institute, Gijub Badheka Marg, Bhavnagar 364002, India
| | - Parameswaran Parvathy
- Department of Chemistry, National Institute of Technology Calicut, Kozhikode, Kerala 673601, India
| | - Pattiyil Parameswaran
- Department of Chemistry, National Institute of Technology Calicut, Kozhikode, Kerala 673601, India
| | - Kirandeep Singh
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, Uttar Pradesh, India
| | - Shabana Khan
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
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Ahmed N, Sharma T, Spillecke L, Koo C, Ansari KU, Tripathi S, Caneschi A, Klingeler R, Rajaraman G, Shanmugam M. Probing the Origin of Ferro-/Antiferromagnetic Exchange Interactions in Cu(II)–4f Complexes. Inorg Chem 2022; 61:5572-5587. [DOI: 10.1021/acs.inorgchem.2c00065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Naushad Ahmed
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai 400076, Maharashtra, India
| | - Tanu Sharma
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai 400076, Maharashtra, India
| | - Lena Spillecke
- Kirchhoff Institute for Physics, Heidelberg University, 69120 Heidelberg, Germany
| | - Changhyun Koo
- Kirchhoff Institute for Physics, Heidelberg University, 69120 Heidelberg, Germany
| | - Kamal Uddin Ansari
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai 400076, Maharashtra, India
| | - Shalini Tripathi
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai 400076, Maharashtra, India
| | - Andrea Caneschi
- Department of Industrial Engineering, “DIEF” and INSTM RU, University of Florence, Via di S. Marta 3, 50131 Florence, Italy
| | - Rüdiger Klingeler
- Kirchhoff Institute for Physics, Heidelberg University, 69120 Heidelberg, Germany
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai 400076, Maharashtra, India
| | - Maheswaran Shanmugam
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai 400076, Maharashtra, India
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5
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Bignardi C, Oliveira LF, Pesqueira NM, Riga-Rocha BA, Machado AE, Carvalho-Jr VP, Goi BE. Photoinduced organometallic mediating radical polymerization of acrylates mediated by CoII complexes of non-symmetrical tetradentate Schiff-base ligands. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2021.113595] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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6
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Field-induced single-ion magnet behaviors in 1-dimensionally assembled tetrahedral cobalt(II) complexes with halide donors. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2021.120667] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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7
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Shao D, Moorthy S, Zhou Y, Wu ST, Zhu JY, Yang J, Wu D, Tian Z, Singh SKK. Field-induced slow magnetic relaxation behaviours in binuclear cobalt(II) metallocycle and exchange-coupled cluster. Dalton Trans 2022; 51:9357-9368. [DOI: 10.1039/d2dt01620f] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Precise control of structures and magnetic properties of a molecular material constitutes an important challenge to realize the tailor-made magnetic function. Herein, we reported that the ligand-directed coordination self-assembly of...
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8
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Taylor RL, Housley D, Barter M, Porch A, Whiston K, Folli A, Murphy DM. The influence of solvent composition on the coordination environment of the Co/Mn/Br based para-xylene oxidation catalyst as revealed by EPR and ESEEM spectroscopy. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00496h] [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
The industrially important para-xylene oxidation reaction, based on a Co/Mn/Br catalyst, operates in a water/acetic acid (H2O/AcOH) solvent system.
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Affiliation(s)
- Rebekah L. Taylor
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
| | - Duncan Housley
- The Wilton Centre, Koch Technology Solutions Ltd., Wilton, Redcar, TS10 4RE, UK
| | - Michael Barter
- School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK
| | - Adrian Porch
- School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK
| | - Keith Whiston
- The Wilton Centre, Koch Technology Solutions Ltd., Wilton, Redcar, TS10 4RE, UK
| | - Andrea Folli
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
| | - Damien M. Murphy
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
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9
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A high-frequency EPR study of magnetic anisotropy and intermolecular interactions of Co(II) ions. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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10
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Photocontrolled reversible-deactivation radical polymerization of butyl acrylate mediated by Salen-type CoII complexes. Eur Polym J 2021. [DOI: 10.1016/j.eurpolymj.2021.110757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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11
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Bhowmick I, Newell BS, Shores MP. A systematic study of the influence of ligand field on the slow magnetic dynamics of Co(ii)-diimine compounds. Dalton Trans 2021; 50:10737-10748. [PMID: 34269774 DOI: 10.1039/d0dt01597k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein we report heteroleptic Co(ii) diimine complexes [Co(H2bip)2Cl2] (1), [Co(H2bip)2Br2] (2), [Co(H2bip)3]Br2·1MeOH (3) and [Co(H2bip)2(Me2bpy)]Br2·(MeCN)0.5·(H2O)0.25 (4) (H2bip = 2,2'-bi-1,4,5,6-tetrahydropyrimidine, bpy = 2,2'-dipyridyl, Me2bpy = 4,4'-Me-2,2'-dipyridyl), purposefully prepared to enable a systematic study of magnetic property changes arising from the increase of overall ligand field from σ/π-donor chlorido (1) to π-acceptor 4,4'Me-2,2'bpy (4). The presence of axial and rhombic anisotropy (D and E) of these compounds is sufficient to allow 1-4 to show field-induced slow relaxation of magnetization. Interestingly, we found as the effective ligand field is increased in the series, rhombicity (E/D) decreases, and the magnetic relaxation profile changes significantly, where relaxation of magnetization at a specific temperature becomes gradually faster. We performed mechanistic analyses of the temperature dependence of magnetic relaxation times considering Orbach relaxation processes, Raman-like relaxation and quantum tunnelling of magnetization (QTM). The effective energy barrier of the Orbach relaxation process (Ueff) is largest in compound 1 (19.2 cm-1) and gradually decreases in the order 1 > 2 > 3 > 4 giving a minimum value in compound 4 (8.3 cm-1), where the Raman-like mechanism showed the possibility of different types of phonon activity below and above ∼2.5 K. As a precursor of 1, the tetrahedral complex [Co(H2bip)Cl2] (1a) was also synthesized and structurally and magnetically characterized: this compound exhibits slow relaxation of magnetization under an applied dc field (1800 Oe) with a record slow relaxation time of 3.39 s at 1.8 K.
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Affiliation(s)
- Indrani Bhowmick
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872, USA.
| | - Brian S Newell
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872, USA. and Analytical Resources Core, Center for Materials and Molecular Analysis, Colorado State University, Fort Collins, Colorado 80523, USA
| | - Matthew P Shores
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872, USA.
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Ravera E, Gigli L, Suturina EA, Calderone V, Fragai M, Parigi G, Luchinat C. A High-Resolution View of the Coordination Environment in a Paramagnetic Metalloprotein from its Magnetic Properties. Angew Chem Int Ed Engl 2021; 60:14960-14966. [PMID: 33595173 DOI: 10.1002/anie.202101149] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Indexed: 12/13/2022]
Abstract
Metalloproteins constitute a significant fraction of the proteome of all organisms and their characterization is critical for both basic sciences and biomedical applications. A large portion of metalloproteins bind paramagnetic metal ions, and paramagnetic NMR spectroscopy has been widely used in their structural characterization. However, the signals of nuclei in the immediate vicinity of the metal center are often broadened beyond detection. In this work, we show that it is possible to determine the coordination environment of the paramagnetic metal in the protein at a resolution inaccessible to other techniques. Taking the structure of a diamagnetic analogue as a starting point, a geometry optimization is carried out by fitting the pseudocontact shifts obtained from first principles quantum chemical calculations to the experimental ones.
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Affiliation(s)
- Enrico Ravera
- Magnetic Resonance Center (CERM), University of Florence, and Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), Via L. Sacconi 6, 50019, Sesto Fiorentino, Italy.,Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3, 50019, Sesto Fiorentino, Italy
| | - Lucia Gigli
- Magnetic Resonance Center (CERM), University of Florence, and Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), Via L. Sacconi 6, 50019, Sesto Fiorentino, Italy.,Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3, 50019, Sesto Fiorentino, Italy
| | | | - Vito Calderone
- Magnetic Resonance Center (CERM), University of Florence, and Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), Via L. Sacconi 6, 50019, Sesto Fiorentino, Italy.,Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3, 50019, Sesto Fiorentino, Italy
| | - Marco Fragai
- Magnetic Resonance Center (CERM), University of Florence, and Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), Via L. Sacconi 6, 50019, Sesto Fiorentino, Italy.,Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3, 50019, Sesto Fiorentino, Italy
| | - Giacomo Parigi
- Magnetic Resonance Center (CERM), University of Florence, and Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), Via L. Sacconi 6, 50019, Sesto Fiorentino, Italy.,Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3, 50019, Sesto Fiorentino, Italy
| | - Claudio Luchinat
- Magnetic Resonance Center (CERM), University of Florence, and Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), Via L. Sacconi 6, 50019, Sesto Fiorentino, Italy.,Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3, 50019, Sesto Fiorentino, Italy
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13
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Ravera E, Gigli L, Suturina EA, Calderone V, Fragai M, Parigi G, Luchinat C. A High‐Resolution View of the Coordination Environment in a Paramagnetic Metalloprotein from its Magnetic Properties. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202101149] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Enrico Ravera
- Magnetic Resonance Center (CERM) University of Florence, and Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP) Via L. Sacconi 6 50019 Sesto Fiorentino Italy
- Department of Chemistry “Ugo Schiff” University of Florence Via della Lastruccia 3 50019 Sesto Fiorentino Italy
| | - Lucia Gigli
- Magnetic Resonance Center (CERM) University of Florence, and Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP) Via L. Sacconi 6 50019 Sesto Fiorentino Italy
- Department of Chemistry “Ugo Schiff” University of Florence Via della Lastruccia 3 50019 Sesto Fiorentino Italy
| | | | - Vito Calderone
- Magnetic Resonance Center (CERM) University of Florence, and Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP) Via L. Sacconi 6 50019 Sesto Fiorentino Italy
- Department of Chemistry “Ugo Schiff” University of Florence Via della Lastruccia 3 50019 Sesto Fiorentino Italy
| | - Marco Fragai
- Magnetic Resonance Center (CERM) University of Florence, and Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP) Via L. Sacconi 6 50019 Sesto Fiorentino Italy
- Department of Chemistry “Ugo Schiff” University of Florence Via della Lastruccia 3 50019 Sesto Fiorentino Italy
| | - Giacomo Parigi
- Magnetic Resonance Center (CERM) University of Florence, and Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP) Via L. Sacconi 6 50019 Sesto Fiorentino Italy
- Department of Chemistry “Ugo Schiff” University of Florence Via della Lastruccia 3 50019 Sesto Fiorentino Italy
| | - Claudio Luchinat
- Magnetic Resonance Center (CERM) University of Florence, and Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP) Via L. Sacconi 6 50019 Sesto Fiorentino Italy
- Department of Chemistry “Ugo Schiff” University of Florence Via della Lastruccia 3 50019 Sesto Fiorentino Italy
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14
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15
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16
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Cobalt(II) complexes of α-diimine derived from cycloalkylamines as controlling agents for organometallic mediated radical polymerization of vinyl acetate. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114870] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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17
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Ostrovsky S, Tomkowicz Z, Foro S, Reedijk J, Haase W. Magneto-optical study of the zero-field splitting in a mononuclear tetrahedrally coordinated Co(II) compound with a mixed ligand surrounding. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114630] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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18
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Saber MR, Przyojski JA, Tonzetich ZJ, Dunbar KR. Slow magnetic relaxation in cobalt N-heterocyclic carbene complexes. Dalton Trans 2020; 49:11577-11582. [PMID: 32749418 DOI: 10.1039/d0dt02286a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The combined experimental and theoretical investigation of the magnetic properties of the cobalt(ii) NHC complexes (NHC = N-heterocyclic carbene); [Co(CH2SiMe3)2(IPr)] (1), [CoCl2(IMes)2] (2) and [Co(CH3)2(IMes)2] (3) revealed a large easy plane anisotropy for 1 (D = +73.7 cm-1) and a moderate easy axis anisotropy for 2 (D = -7.7 cm-1) due to significant out-of-state spin-orbit coupling. Dynamic magnetic measurements revealed slow relaxation of the magnetization for 1 (Ueff = 22.5 K, τ0 = 3 × 10-7 s, 1000 Oe) and for 2 (Ueff = 20.2 K, τ0 = 1.73 × 10-8 s, 1500 Oe). The molecular origin of the slow relaxation phenomena was further supported by the retention of AC signal in 10% solutions in 2-MeTHF which reveals a second zero field AC signal in 1 at higher frequencies. Compound 3 was found to be an S = 1/2 system.
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Affiliation(s)
- Mohamed R Saber
- Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA. and Chemistry Department, Faculty of Science, Fayoum University, Fayoum 63514, Egypt
| | - Jacob A Przyojski
- Department of Chemistry, University of Texas at San Antonio (UTSA), San Antonio, TX 78249, USA
| | - Zachary J Tonzetich
- Department of Chemistry, University of Texas at San Antonio (UTSA), San Antonio, TX 78249, USA
| | - Kim R Dunbar
- Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA.
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Hrubý J, Dvořák D, Squillantini L, Mannini M, van Slageren J, Herchel R, Nemec I, Neugebauer P. Co(II)-Based single-ion magnets with 1,1'-ferrocenediyl-bis(diphenylphosphine) metalloligands. Dalton Trans 2020; 49:11697-11707. [PMID: 32789384 DOI: 10.1039/d0dt01512a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Herein, we report on investigations of magnetic and spectroscopic properties of three heterobimetallic Fe(ii)-Co(ii) coordination compounds based on the tetracoordinate {CoP2X2} core encapsulated by dppf metalloligand, where X = Cl (1), Br (2), I (3), dppf = 1,1'-ferrocenediyl -bis(diphenylphosphine). The analysis of static magnetic data has revealed the presence of axial magnetic anisotropy in compounds (1) and (2) and this was further confirmed by high-frequency electron spin resonance (HF-ESR) spectroscopy. Dynamic magnetic data confirmed that (1) and (2) behave as field-induced Single-Ion Magnets (SIMs). Together with bulk studies, we have also tested the possibility of depositing (2) as thick films on Au(111), glass, and polymeric acetate by drop-casting as well as thermal sublimation, a key aspect for the development of future devices embedding these magnetic objects.
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Affiliation(s)
- J Hrubý
- Central European Institute of Technology, CEITEC BUT, Purkyňova 656/123, 61200 Brno, Czech Republic.
| | - D Dvořák
- Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, 77147 Olomouc, Czech Republic
| | - L Squillantini
- Department of Chemistry "Ugo Schiff", University of Florence and INSTM Research Unit of Florence, via Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - M Mannini
- Department of Chemistry "Ugo Schiff", University of Florence and INSTM Research Unit of Florence, via Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - J van Slageren
- Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - R Herchel
- Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, 77147 Olomouc, Czech Republic
| | - I Nemec
- Central European Institute of Technology, CEITEC BUT, Purkyňova 656/123, 61200 Brno, Czech Republic. and Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, 77147 Olomouc, Czech Republic
| | - P Neugebauer
- Central European Institute of Technology, CEITEC BUT, Purkyňova 656/123, 61200 Brno, Czech Republic.
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20
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Yao B, Singh MK, Deng YF, Wang YN, Dunbar KR, Zhang YZ. Trigonal Prismatic Cobalt(II) Single-Ion Magnets: Manipulating the Magnetic Relaxation Through Symmetry Control. Inorg Chem 2020; 59:8505-8513. [DOI: 10.1021/acs.inorgchem.0c00950] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Binling Yao
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
| | - Mukesh Kumar Singh
- Department of Chemistry, Texas A&M University, College Station, Texas 77842, United States
| | - Yi-Fei Deng
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
| | - Yi-Nuo Wang
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
| | - Kim R. Dunbar
- Department of Chemistry, Texas A&M University, College Station, Texas 77842, United States
| | - Yuan-Zhu Zhang
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
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21
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Synthesis, Crystal Structures and Magnetic Properties of Mononuclear High-Spin Cobalt(II) Complex. CRYSTALS 2020. [DOI: 10.3390/cryst10020087] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A new four-coordinated high-spin Co(II) complex was synthesized through the reactions of Co(NSC)2 with bathocuproine, by the diffusion method, resulting in an infinite one-dimension chain. Both static and dynamic magnetic properties were measured. The magnetic properties investigation shows that the single CoII ion properties dominate the magnetic behavior in the complex. Despite the presence of a four-coordinated single CoII ion, no SMM properties were exhibited by the complex.
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22
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Vassilyeva OY, Buvaylo EA, Kokozay VN, Skelton BW, Rajnák C, Titiš J, Boča R. Long magnetic relaxation time of tetracoordinate Co 2+ in imidazo[1,5-a]pyridinium-based (C 13H 12N 3) 2[CoCl 4] hybrid salt and [Co(C 13H 12N 3)Cl 3] molecular complex. Dalton Trans 2019; 48:11278-11284. [PMID: 31268102 DOI: 10.1039/c9dt01642b] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The novel organic-inorganic hybrid salt [L]2[CoCl4] (1) and molecular complex [CoLCl3] (2), where L+ is 2-methyl-3-(pyridin-2-yl)imidazo[1,5-a]pyridinium cation, feature simple {CoCl4} and {CoCl3N} tetrahedral environments of negligible (1) and a slightly higher distortion (2) that are responsible for rather low positive magnetic anisotropy of CoII ion with D/hc = 12.1(6) (1) and 19.4(15) cm-1 (2). Both compounds exhibit field-induced slow magnetic relaxation with three relaxation channels [low- (LF), intermediate- and high-frequency (HF) modes] that is frequency and field dependent. With the increased DC field, the peaks referring to the LF relaxation path are moved to lower frequencies so that the applied DC field causes prolongation of the relaxation time. The opposite is true for the HF relaxation branch: the peak is moved to higher frequencies. Considering the simplicity of the coordination environment and moderate magnetic anisotropy of the metal ion in 1 and 2, the compounds are unique with respect to the remarkably long relaxation time for a given applied DC field and temperature: τLF = 0.54(4) s at BDC = 1.0 T and T = 2.0 K for 1, and τLF = 1.8(2) s at BDC = 1.2 T and T = 1.9 K for 2.
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Affiliation(s)
- Olga Yu Vassilyeva
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13 Volodymyrska str., Kyiv 01601, Ukraine.
| | - Elena A Buvaylo
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13 Volodymyrska str., Kyiv 01601, Ukraine.
| | - Vladimir N Kokozay
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13 Volodymyrska str., Kyiv 01601, Ukraine.
| | - Brian W Skelton
- School of Molecular Sciences, Chemistry M310, the University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia
| | - Cyril Rajnák
- Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius, 91701 Trnava, Slovakia
| | - Ján Titiš
- Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius, 91701 Trnava, Slovakia
| | - Roman Boča
- Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius, 91701 Trnava, Slovakia
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23
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Méndez-Arriaga JM, Oyarzabal I, Martín-Montes Á, García-Rodríguez J, Quirós M, Sánchez-Moreno M. First Example of Antiparasitic Activity Influenced by Thermochromism: Leishmanicidal Evaluation of 5,7-dimethyl-1,2,4-triazolo[1,5-a]pyrimidine Metal Complexes. Med Chem 2019; 16:422-430. [PMID: 30931864 DOI: 10.2174/1573406415666190401120607] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Revised: 01/31/2019] [Accepted: 03/07/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND The World Health Organization catalogues illnesses such as Leishmaniasis as neglected diseases, due to low investment in new drugs to fight them. The search of novel and non-side effects anti-parasitic compounds is one of the urgent needs for the Third World. The use of triazolopyrimidines and their metallic complexes has demonstrated hopeful results in this field. OBJECTIVE This work studies the antiparasitic efficacy of a series of 5,7-dimethyl-1,2,4- triazolo[1,5-a]pyrimidine first row transition metal complexes against three leishmania spp. strains. METHODS The in vitro antiproliferation of promastigote forms of different strains of leishmania spp. (L. infantum, L. braziliensis and L donovani) and the cytotoxicity in macrophage host cells are reported here. The antiparasitic assays have been complemented with enzymatic tests to elucidate the mechanisms of action. New crystal structure description, thermal analysis, magnetic susceptibility and magnetization experiments have also been carried out in order to present a whole characterization of the studied compounds and interesting physical properties besides the biological tests. RESULTS The results of antiproliferation screening and cytotoxicity show great antiparasitic efficacy in the studied complexes. The superoxide dismutase enzymatic assays exhibit a different behaviour according to the thermochromic triazolopyrimidine form tested. CONCLUSION Antiproliferative assays and enzymatic tests corroborate the synergetic leishmanicidal effect present in coordination triazolopyrimidine complexes. The changes in coordination sphere derived from thermochromism affect the physical properties as well as the biological efficacy.
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Affiliation(s)
- José M Méndez-Arriaga
- Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva, 18071 Granada, Spain.,Department of Parasitology, Faculty of Sciences, University of Granada Avda. Fuentenueva, 18071 Granada, Spain
| | - Itziar Oyarzabal
- CNRS, CRPP, UMR 5031, 33600 Pessac, France.,University of Bordeaux, CRPP, UMR 5031, 33600 Pessac, France
| | - Álvaro Martín-Montes
- Department of Parasitology, Faculty of Sciences, University of Granada Avda. Fuentenueva, 18071 Granada, Spain
| | - Judith García-Rodríguez
- Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva, 18071 Granada, Spain
| | - Miguel Quirós
- Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva, 18071 Granada, Spain
| | - Manuel Sánchez-Moreno
- Department of Parasitology, Faculty of Sciences, University of Granada Avda. Fuentenueva, 18071 Granada, Spain
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24
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Ishizaki T, Fukuda T, Akaki M, Fuyuhiro A, Hagiwara M, Ishikawa N. Synthesis of a Neutral Mononuclear Four-Coordinate Co(II) Complex Having Two Halved Phthalocyanine Ligands That Shows Slow Magnetic Relaxations under Zero Static Magnetic Field. Inorg Chem 2019; 58:5211-5220. [DOI: 10.1021/acs.inorgchem.9b00286] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Toshiharu Ishizaki
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Takamitsu Fukuda
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Mitsuru Akaki
- Center for Advanced High Magnetic Field Science (AHMF), Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Akira Fuyuhiro
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Masayuki Hagiwara
- Center for Advanced High Magnetic Field Science (AHMF), Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Naoto Ishikawa
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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25
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Váhovská L, Bukrynov O, Potočňák I, Čižmár E, Kliuikov A, Vitushkina S, Dušek M, Herchel R. New Cobalt(II) Field‐Induced Single‐Molecule Magnet and the First Example of a Cobalt(III) Complex with Tridentate Binding of a Deprotonated 4‐Amino‐3,5‐bis(pyridin‐2‐yl)‐1,2,4‐Triazole Ligand. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201801225] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Lucia Váhovská
- University of Veterinary Medicine and Pharmacy in Košice Department of Chemistry Biochemistry and Biophysics Institute of Biochemistry, Komenského 73, SK‐041 84 Košice Slovakia
| | - Oleksandr Bukrynov
- V.N. Karazin Kharkiv National University, Faculty of Chemistry, Department of Applied Chemistry Svobody sq. 4 UA-61022 Kharkiv Ukraine
| | - Ivan Potočňák
- P.J. Šafárik University in Košice, Faculty of Science, Institute of Chemistry, Department of Inorganic Chemistry Moyzesova 11 SK-041 54 Košice Slovakia
| | - Erik Čižmár
- P.J. Šafárik University in Košice, Faculty of Science, Institute of Physics Park Angelinum 9 SK-041 54 Košice Slovakia
| | - Andrii Kliuikov
- P.J. Šafárik University in Košice, Faculty of Science, Institute of Physics Park Angelinum 9 SK-041 54 Košice Slovakia
| | - Svitlana Vitushkina
- V.N. Karazin Kharkiv National University, Faculty of Chemistry, Department of Applied Chemistry Svobody sq. 4 UA-61022 Kharkiv Ukraine
| | - Michal Dušek
- Institute of Physics of the Czech Academy of Sciences Czech Republic
| | - Radovan Herchel
- Department of Inorganic Chemistry Faculty of Science, Palacký University 17. listopadu 12 CZ‐771 46 Olomouc Czech Republic
- Regional Centre of Advanced Technologies and Materials Faculty of Science Palacký University Šlechtitelů 27 CZ-783 71 Olomouc Czech Republic
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26
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Pérez AL, Kemmerer A, Rey MA, Dalosto SD, Ramos CA, Passeggi MCG, Rizzi AC, Brondino CD. Coupled High Spin Co
II
Ions Linked by Symmetrical Double Hydrogen Bonds: Role of a Slowly Relaxing Cu
II
Impurity in Interrupting the Co
II
–Co
II
Exchange Interaction. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800593] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ana L. Pérez
- Departamento de Física Facultad de Bioquímica y Ciencias Biológicas Universidad Nacional del Litoral ‐ CONICET Ciudad Universitaria S3000ZAA Santa Fe Argentina
| | - Axel Kemmerer
- Departamento de Física Facultad de Bioquímica y Ciencias Biológicas Universidad Nacional del Litoral ‐ CONICET Ciudad Universitaria S3000ZAA Santa Fe Argentina
| | - Marilin A. Rey
- Departamento de Física Facultad de Bioquímica y Ciencias Biológicas Universidad Nacional del Litoral ‐ CONICET Ciudad Universitaria S3000ZAA Santa Fe Argentina
| | - Sergio D. Dalosto
- Instituto de Física del Litoral Universidad Nacional del Litoral ‐ CONICET Güemes 3450 3000 Santa Fe Argentina
| | - Carlos A. Ramos
- Centro Atómico Bariloche Comisión Nacional de Energía Atómica Av. Bustillo 9500 8400 Bariloche Río Negro Argentina
| | - Mario C. G. Passeggi
- Departamento de Física Facultad de Bioquímica y Ciencias Biológicas Universidad Nacional del Litoral ‐ CONICET Ciudad Universitaria S3000ZAA Santa Fe Argentina
- Instituto de Física del Litoral Universidad Nacional del Litoral ‐ CONICET Güemes 3450 3000 Santa Fe Argentina
| | - Alberto C. Rizzi
- Departamento de Física Facultad de Bioquímica y Ciencias Biológicas Universidad Nacional del Litoral ‐ CONICET Ciudad Universitaria S3000ZAA Santa Fe Argentina
| | - Carlos D. Brondino
- Departamento de Física Facultad de Bioquímica y Ciencias Biológicas Universidad Nacional del Litoral ‐ CONICET Ciudad Universitaria S3000ZAA Santa Fe Argentina
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27
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Silva YF, Riga BA, Deflon VM, Souza JR, Silva LHF, Machado AEH, Maia PIS, Valdemiro P. CJ, Goi BE. Organometallic-mediated radical polymerization using well-defined Schiff base cobalt(II) complexes. J COORD CHEM 2018. [DOI: 10.1080/00958972.2018.1527322] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Yan F. Silva
- Faculdade de Ciências e Tecnologia, UNESP – Univ. Estadual Paulista, Presidente Prudente, SP, Brazil
| | - Beatriz A. Riga
- Faculdade de Ciências e Tecnologia, UNESP – Univ. Estadual Paulista, Presidente Prudente, SP, Brazil
| | - Victor M. Deflon
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil
| | - Jhonathan R. Souza
- Instituto de Química, Universidade Federal de Uberlândia, Uberlândia, Minas Gerais, Brazil
| | - Leonardo H. F. Silva
- Instituto de Química, Universidade Federal de Uberlândia, Uberlândia, Minas Gerais, Brazil
| | - Antonio E. H. Machado
- Instituto de Química, Universidade Federal de Uberlândia, Uberlândia, Minas Gerais, Brazil
| | - Pedro Ivo S. Maia
- Departamento de Química, Universidade Federal do Triangulo Mineiro, Uberaba, MG, Brazil
| | - Carvalho-Jr Valdemiro P.
- Faculdade de Ciências e Tecnologia, UNESP – Univ. Estadual Paulista, Presidente Prudente, SP, Brazil
| | - Beatriz E. Goi
- Faculdade de Ciências e Tecnologia, UNESP – Univ. Estadual Paulista, Presidente Prudente, SP, Brazil
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28
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Switlicka A, Machura B, Kruszynski R, Cano J, Toma LM, Lloret F, Julve M. The influence of pseudohalide ligands on the SIM behaviour of four-coordinate benzylimidazole-containing cobalt(ii) complexes. Dalton Trans 2018; 47:5831-5842. [PMID: 29648565 DOI: 10.1039/c7dt04735e] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three, mononuclear complexes of the formula [Co(bmim)2(SCN)2] (1), [Co(bmim)2(NCO)2] (2) and [Co(bmim)2(N3)2] (3) [bmim = 1-benzyl-2-methylimidazole] were prepared and structurally analyzed by single-crystal X-ray crystallography. The cobalt(ii) ions in 1-3 are tetrahedrally coordinated with two bmim molecules and two pseudohalide anions. The angular distortion parameter δ was calculated and the SHAPE program (based on the CShM concept) was used for 1-3 to estimate the angular distortion from an ideal tetrahedron. The molecules of 1-3 are effectively separated, and the values of the shortest distance of cobalt-cobalt are 8.442(6) and 6.774(8) Å for 1, 10.349(8) and 10.716(8) Å for 2 and 6.778(1) and 9.232(1) Å for 3. Direct current (dc) magnetic susceptibility measurements on the crushed crystals of 1-3 were carried out in the temperature range 1.9-295 K. The variable-temperature magnetic data of 1-3 mainly obey the zero-field splitting effect (D) of the 4A2 ground term of the tetrahedral cobalt(ii) complexes (2D being the energy gap between the |±1/2 and |±3/2 levels of the spin). The analysis of their magnetic data through the Hamiltonian H = D[S2z - S(S + 1)/3] + E(Sx2 - Sy2) + gβHS led to the following best-fit parameters: g = 2.29, D = -7.5 cm-1 and E/D = 0.106 (1), g = 2.28, D = + 6.3 cm-1 and E/D = 0.007 (2) and g = 2.36, D = + 6.7 cm-1 and E/D = 0.090 (3). The signs of D for 1-3 were confirmed by Q-band EPR spectra on powdered samples in the temperature range 4.0-20 K. Field-induced SIM behaviour was observed for 1-3 below 4.0 K, and the frequency-dependent maxima of χ''M were observed for 1 and only incipient signals of χ''M occurred for 2 and 3. The values of the exponential factor (τ0) and activation energy (Ea) for 1-3 which were obtained from the Arrhenius plot suggest a single relaxation process characteristic of an Orbach mechanism.
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Affiliation(s)
- A Switlicka
- Department of Crystallography, Institute of Chemistry, University of Silesia, 9th Szkolna St., 40-006 Katowice, Poland.
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29
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Rajnák C, Varga F, Titiš J, Moncol J, Boča R. Octahedral-Tetrahedral Systems [Co( dppm O, O) 3] 2+[CoX 4] 2- Showing Slow Magnetic Relaxation with Two Relaxation Modes. Inorg Chem 2018; 57:4352-4358. [PMID: 29600851 DOI: 10.1021/acs.inorgchem.7b03193] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Three compounds with octahedral-tetrahedral Co(II) moieties of [Co( dppm O, O)3][CoX4] type, where X = SCN (1), Cl (2), or I (4) have been synthesized and characterized by the X-ray structure analysis (1 and 4), and spectroscopic methods. The dc magnetic measurements show high magnetic anisotropy for octahedral centers whereas tetrahedral sites possess moderate D values. These results are confirmed by the ab initio calculations. The ac susceptibility data reveals a slow magnetic relaxation for 2 and 4, similar to that of the X = Br analogue (3), whereas 1 displays no ac-absorption signal. There are two relaxation channels; the slower for 2 (4) possesses a relaxation time as long as τLF= 178 (588) ms at T = 1.9 K and Bdc = 0.7 T. Also, the half-Zn analogue, [Co( dppm O, O)3][ZnI4], shows slow magnetic relaxation with two relaxation channels conditioned by the cationic unit [Co( dppm O, O)3]2+.
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Affiliation(s)
- Cyril Rajnák
- Department of Chemistry, Faculty of Natural Sciences , University of SS. Cyril and Methodius , 917 01 Trnava , Slovakia
| | - Filip Varga
- Department of Chemistry, Faculty of Natural Sciences , University of SS. Cyril and Methodius , 917 01 Trnava , Slovakia
| | - Ján Titiš
- Department of Chemistry, Faculty of Natural Sciences , University of SS. Cyril and Methodius , 917 01 Trnava , Slovakia
| | - Ján Moncol
- Institute of Inorganic Chemistry , Slovak University of Technology , 812 38 Bratislava , Slovakia
| | - Roman Boča
- Department of Chemistry, Faculty of Natural Sciences , University of SS. Cyril and Methodius , 917 01 Trnava , Slovakia
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30
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Riga BA, Neves MD, Machado AE, Araújo DM, Souza JR, Nascimento OR, Santana VT, Cavalheiro CC, Carvalho-Jr VP, Goi BE. Synthesis of cobalt(II)-α-diimines complexes and their activity as mediators in organometallic mediated radical polymerization of vinyl acetate. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.11.041] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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31
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Order-disorder structural phase transition and magnetocaloric effect in organic-inorganic halide hybrid (C2H5NH3)2CoCl4. J SOLID STATE CHEM 2018. [DOI: 10.1016/j.jssc.2017.10.036] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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32
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Gupta T, Rajaraman G. Modelling spin Hamiltonian parameters of molecular nanomagnets. Chem Commun (Camb) 2018; 52:8972-9008. [PMID: 27366794 DOI: 10.1039/c6cc01251e] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular nanomagnets encompass a wide range of coordination complexes possessing several potential applications. A formidable challenge in realizing these potential applications lies in controlling the magnetic properties of these clusters. Microscopic spin Hamiltonian (SH) parameters describe the magnetic properties of these clusters, and viable ways to control these SH parameters are highly desirable. Computational tools play a proactive role in this area, where SH parameters such as isotropic exchange interaction (J), anisotropic exchange interaction (Jx, Jy, Jz), double exchange interaction (B), zero-field splitting parameters (D, E) and g-tensors can be computed reliably using X-ray structures. In this feature article, we have attempted to provide a holistic view of the modelling of these SH parameters of molecular magnets. The determination of J includes various class of molecules, from di- and polynuclear Mn complexes to the {3d-Gd}, {Gd-Gd} and {Gd-2p} class of complexes. The estimation of anisotropic exchange coupling includes the exchange between an isotropic metal ion and an orbitally degenerate 3d/4d/5d metal ion. The double-exchange section contains some illustrative examples of mixed valance systems, and the section on the estimation of zfs parameters covers some mononuclear transition metal complexes possessing very large axial zfs parameters. The section on the computation of g-anisotropy exclusively covers studies on mononuclear Dy(III) and Er(III) single-ion magnets. The examples depicted in this article clearly illustrate that computational tools not only aid in interpreting and rationalizing the observed magnetic properties but possess the potential to predict new generation MNMs.
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Affiliation(s)
- Tulika Gupta
- Department of Chemistry, IIT Powai, Mumbai-400076, India.
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34
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Sikdar Y, Goswami R, Modak R, Basak M, Heras Ojea MJ, Murrie M, Goswami S. Diazine based ligand supported CoII3 and CoII4 coordination complexes: role of anions. NEW J CHEM 2018. [DOI: 10.1039/c8nj02955e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Synthesis of triple helical CoII4 and double helical CoII3 from diazine-based ligands and their magnetic behavior rationalized by susceptibility measurements.
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Affiliation(s)
- Yeasin Sikdar
- Department of Chemistry
- University of Calcutta
- 92, A.P.C. Road
- Kolkata
- India
| | - Ranadip Goswami
- Department of Chemistry
- University of Calcutta
- 92, A.P.C. Road
- Kolkata
- India
| | - Ritwik Modak
- Department of Chemistry
- University of Calcutta
- 92, A.P.C. Road
- Kolkata
- India
| | - Megha Basak
- Department of Chemistry
- University of Calcutta
- 92, A.P.C. Road
- Kolkata
- India
| | | | - Mark Murrie
- WestCHEM, School of Chemistry
- University of Glasgow
- University Avenue
- Glasgow
- UK
| | - Sanchita Goswami
- Department of Chemistry
- University of Calcutta
- 92, A.P.C. Road
- Kolkata
- India
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35
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Mondal AK, Sundararajan M, Konar S. A new series of tetrahedral Co(ii) complexes [CoLX2] (X = NCS, Cl, Br, I) manifesting single-ion magnet features. Dalton Trans 2018; 47:3745-3754. [DOI: 10.1039/c7dt04007e] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The influence of ligand field strength on the magnetic anisotropy of a series of isostructural tetrahedral CoII complexes has been investigated by using a combined experimental and theoretical approach.
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Affiliation(s)
- Amit Kumar Mondal
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal
- Bhauri
- India
| | - Mahesh Sundararajan
- Theoretical Chemistry Section
- Bhabha Atomic Research Centre
- Mumbai 400085
- India
| | - Sanjit Konar
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal
- Bhauri
- India
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36
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Váhovská L, Vitushkina S, Potočňák I, Trávníček Z, Herchel R. Effect of linear and non-linear pseudohalides on the structural and magnetic properties of Co(ii) hexacoordinate single-molecule magnets. Dalton Trans 2018; 47:1498-1512. [DOI: 10.1039/c7dt04256f] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Field-induced single-molecule magnets based on Co(ii) hexacoordinate complexes comprising pseudohalides are reported.
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Affiliation(s)
- L. Váhovská
- P. J. Šafarik University in Košice
- Department of Inorganic Chemistry
- Institute of Chemistry
- Košice
- Slovakia
| | - S. Vitushkina
- V.N. Karazin Kharkov National University
- Faculty of Chemistry
- Department of Applied Chemistry
- Kharkov
- Ukraine
| | - I. Potočňák
- University of Veterinary Medicine and Pharmacy in Košice
- Department of Chemistry
- Biochemistry and Biophysics
- Institute of Biochemistry
- Košice
| | - Z. Trávníček
- Department of Inorganic Chemistry
- Regional Centre of Advanced Technologies and Materials
- Faculty of Science
- Palacký University
- Olomouc
| | - R. Herchel
- Department of Inorganic Chemistry
- Regional Centre of Advanced Technologies and Materials
- Faculty of Science
- Palacký University
- Olomouc
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37
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Lu J, Ozel IO, Belvin CA, Li X, Skorupskii G, Sun L, Ofori-Okai BK, Dincă M, Gedik N, Nelson KA. Rapid and precise determination of zero-field splittings by terahertz time-domain electron paramagnetic resonance spectroscopy. Chem Sci 2017; 8:7312-7323. [PMID: 29163882 PMCID: PMC5672788 DOI: 10.1039/c7sc00830a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Accepted: 04/10/2017] [Indexed: 01/09/2023] Open
Abstract
Zero-field splitting (ZFS) parameters are fundamentally tied to the geometries of metal ion complexes. Despite their critical importance for understanding the magnetism and spectroscopy of metal complexes, they are not routinely available through general laboratory-based techniques, and are often inferred from magnetism data. Here we demonstrate a simple tabletop experimental approach that enables direct and reliable determination of ZFS parameters in the terahertz (THz) regime. We report time-domain measurements of electron paramagnetic resonance (EPR) signals associated with THz-frequency ZFSs in molecular complexes containing high-spin transition-metal ions. We measure the temporal profiles of the free-induction decays of spin resonances in the complexes at zero and nonzero external magnetic fields, and we derive the EPR spectra via numerical Fourier transformation of the time-domain signals. In most cases, absolute values of the ZFS parameters are extracted from the measured zero-field EPR frequencies, and the signs can be determined by zero-field measurements at two different temperatures. Field-dependent EPR measurements further allow refined determination of the ZFS parameters and access to the g-factor. The results show good agreement with those obtained by other methods. The simplicity of the method portends wide applicability in chemistry, biology and material science.
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Affiliation(s)
- Jian Lu
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , USA .
| | - I Ozge Ozel
- Department of Physics , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , USA
| | - Carina A Belvin
- Department of Physics , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , USA
| | - Xian Li
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , USA .
| | - Grigorii Skorupskii
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , USA .
| | - Lei Sun
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , USA .
| | - Benjamin K Ofori-Okai
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , USA .
| | - Mircea Dincă
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , USA .
| | - Nuh Gedik
- Department of Physics , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , USA
| | - Keith A Nelson
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , USA .
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38
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Vaidya S, Singh SK, Shukla P, Ansari K, Rajaraman G, Shanmugam M. Role of Halide Ions in the Nature of the Magnetic Anisotropy in Tetrahedral Co
II
Complexes. Chemistry 2017; 23:9546-9559. [DOI: 10.1002/chem.201606031] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Shefali Vaidya
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai- 400076, Maharashtra India
| | - Saurabh Kumar Singh
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai- 400076, Maharashtra India
- Department of Molecular Theory and SpectroscopyMax-Planck Institute for Chemical Energy Conversion Mülheim an der Ruhr 45470 Germany
| | - Pragya Shukla
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai- 400076, Maharashtra India
| | - Kamaluddin Ansari
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai- 400076, Maharashtra India
| | - Gopalan Rajaraman
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai- 400076, Maharashtra India
| | - Maheswaran Shanmugam
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai- 400076, Maharashtra India
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39
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Pavlov AA, Savkina SA, Belov AS, Nelyubina YV, Efimov NN, Voloshin YZ, Novikov VV. Trigonal Prismatic Tris-pyridineoximate Transition Metal Complexes: A Cobalt(II) Compound with High Magnetic Anisotropy. Inorg Chem 2017; 56:6943-6951. [DOI: 10.1021/acs.inorgchem.7b00447] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alexander A. Pavlov
- Nesmeyanov Institute
of Organoelement Compounds, Russian Academy of Sciences, Vavilova str. 28, 119991, Moscow, Russia
| | - Svetlana A. Savkina
- Nesmeyanov Institute
of Organoelement Compounds, Russian Academy of Sciences, Vavilova str. 28, 119991, Moscow, Russia
| | - Alexander S. Belov
- Nesmeyanov Institute
of Organoelement Compounds, Russian Academy of Sciences, Vavilova str. 28, 119991, Moscow, Russia
| | - Yulia V. Nelyubina
- Nesmeyanov Institute
of Organoelement Compounds, Russian Academy of Sciences, Vavilova str. 28, 119991, Moscow, Russia
- Kurnakov Institute
of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii prosp., 31, 117901, Moscow, Russia
| | - Nikolay N. Efimov
- Kurnakov Institute
of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii prosp., 31, 117901, Moscow, Russia
| | - Yan Z. Voloshin
- Nesmeyanov Institute
of Organoelement Compounds, Russian Academy of Sciences, Vavilova str. 28, 119991, Moscow, Russia
- Kurnakov Institute
of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii prosp., 31, 117901, Moscow, Russia
| | - Valentin V. Novikov
- Nesmeyanov Institute
of Organoelement Compounds, Russian Academy of Sciences, Vavilova str. 28, 119991, Moscow, Russia
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40
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Schweinfurth D, Krzystek J, Atanasov M, Klein J, Hohloch S, Telser J, Demeshko S, Meyer F, Neese F, Sarkar B. Tuning Magnetic Anisotropy Through Ligand Substitution in Five-Coordinate Co(II) Complexes. Inorg Chem 2017; 56:5253-5265. [DOI: 10.1021/acs.inorgchem.7b00371] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- David Schweinfurth
- Institut für
Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße
34-36, D-14195 Berlin, Germany
| | - J. Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Mihail Atanasov
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, D-45470 Mülheim an der Ruhr, Germany
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Johannes Klein
- Institut für
Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße
34-36, D-14195 Berlin, Germany
| | - Stephan Hohloch
- Institut für
Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße
34-36, D-14195 Berlin, Germany
| | - Joshua Telser
- Department of Biological, Chemical, and Physical Sciences, Roosevelt University, Chicago, Illinois 60605, United States
| | - Serhiy Demeshko
- Universität Göttingen, Institut
für Anorganische Chemie, Tammanstraße 4, D-37077 Göttingen, Germany
| | - Franc Meyer
- Universität Göttingen, Institut
für Anorganische Chemie, Tammanstraße 4, D-37077 Göttingen, Germany
| | - Frank Neese
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Biprajit Sarkar
- Institut für
Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße
34-36, D-14195 Berlin, Germany
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41
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42
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Magnetic Anisotropy and Field-induced Slow Relaxation of Magnetization in Tetracoordinate Co II Compound [Co(CH₃-im)₂Cl₂]. MATERIALS 2017; 10:ma10030249. [PMID: 28772606 PMCID: PMC5503352 DOI: 10.3390/ma10030249] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 02/27/2017] [Indexed: 12/04/2022]
Abstract
Static and dynamic magnetic properties of the tetracoordinate CoII complex [Co(CH3-im)2Cl2], (1, CH3-im = N-methyl-imidazole), studied using thorough analyses of magnetometry, and High-Frequency and -Field EPR (HFEPR) measurements, are reported. The study was supported by ab initio complete active space self-consistent field (CASSCF) calculations. It has been revealed that 1 possesses a large magnetic anisotropy with a large rhombicity (magnetometry: D = −13.5 cm−1, E/D = 0.33; HFEPR: D = −14.5(1) cm−1, E/D = 0.16(1)). These experimental results agree well with the theoretical calculations (D = −11.2 cm−1, E/D = 0.18). Furthermore, it has been revealed that 1 behaves as a field-induced single-ion magnet with a relatively large spin-reversal barrier (Ueff = 33.5 K). The influence of the Cl–Co–Cl angle on magnetic anisotropy parameters was evaluated using the CASSCF calculations.
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43
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Suturina EA, Nehrkorn J, Zadrozny JM, Liu J, Atanasov M, Weyhermüller T, Maganas D, Hill S, Schnegg A, Bill E, Long JR, Neese F. Magneto-Structural Correlations in Pseudotetrahedral Forms of the [Co(SPh)4]2– Complex Probed by Magnetometry, MCD Spectroscopy, Advanced EPR Techniques, and ab Initio Electronic Structure Calculations. Inorg Chem 2017; 56:3102-3118. [DOI: 10.1021/acs.inorgchem.7b00097] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Elizaveta A. Suturina
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
- Novosibirsk State University, Pirogova 2, 630090 Novosibirsk, Russia
| | - Joscha Nehrkorn
- Berlin Joint EPR Lab, Institute for Nanospectroscopy, Helmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstraße
5, 12489 Berlin, Germany
| | - Joseph M. Zadrozny
- Department of Chemistry, University of California Berkeley, Berkeley, California 94720, United States
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Junjie Liu
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1
3PU, United Kingdom
| | - Mihail Atanasov
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
- Bulgarian Academy of Sciences, Institute of General and Inorganic
Chemistry, Akad. Georgi
Bontchev Street 11, 1113 Sofia, Bulgaria
| | - Thomas Weyhermüller
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
| | - Dimitrios Maganas
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
| | - Stephen Hill
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
- Department of Physics, Florida State University, Tallahassee, Florida 32306, United States
| | - Alexander Schnegg
- Berlin Joint EPR Lab, Institute for Nanospectroscopy, Helmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstraße
5, 12489 Berlin, Germany
| | - Eckhard Bill
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
| | - Jeffrey R. Long
- Department of Chemistry, University of California Berkeley, Berkeley, California 94720, United States
| | - Frank Neese
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
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44
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Stinghen D, Rüdiger AL, Giese SOK, Nunes GG, Soares JF, Hughes DL. Cobalt(II) chloride adducts with acetonitrile, propan-2-ol and tetrahydrofuran: considerations on nuclearity, reactivity and synthetic applications. Acta Crystallogr C 2017; 73:104-114. [DOI: 10.1107/s2053229617000705] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Accepted: 01/13/2017] [Indexed: 11/10/2022] Open
Abstract
High-spin cobalt(II) complexes are considered useful building blocks for the synthesis of single-molecule magnets (SMM) because of their intrinsic magnetic anisotropy. In this work, three new cobalt(II) chloride adducts with labile ligands have been synthesized from anhydrous CoCl2, to be subsequently employed as starting materials for heterobimetallic compounds. The products were characterized by elemental, spectroscopic (EPR and FT–IR) and single-crystal X-ray diffraction analyses.trans-Tetrakis(acetonitrile-κN)bis(tetrahydrofuran-κO)cobalt(II) bis[(acetonitrile-κN)trichloridocobaltate(II)], [Co(C2H3N)4(C4H8O)2][CoCl3(C2H3N)]2, (1), comprises mononuclear ions and contains both acetonitrile and tetrahydrofuran (thf) ligands, The coordination polymercatena-poly[[tetrakis(propan-2-ol-κO)cobalt(II)]-μ-chlorido-[dichloridocobalt(II)]-μ-chlorido], [Co2Cl4(C3H8O)4], (2′), was prepared by direct reaction between anhydrous CoCl2and propan-2-ol in an attempt to rationalize the formation of the CoCl2–alcohol adduct (2), probably CoCl2(HOiPr)m. The binuclear complex di-μ-chlorido-1:2κ4Cl:Cl-dichlorido-2κ2Cl-tetrakis(tetrahydrofuran-1κO)dicobalt(II), [Co2Cl4(C4H8O)4], (3), was obtained from (2) after recrystallization from tetrahydrofuran. All three products present cobalt(II) centres in both octahedral and tetrahedral environments, the former usually less distorted than the latter, regardless of the nature of the neutral ligand. Product (2′) is stabilized by an intramolecular hydrogen-bond network that appears to favour atransarrangement of the chloride ligands in the octahedral moiety; this differs from thecisdisposition found in (3). The expected easy displacement of the bound solvent molecules from the metal coordination sphere makes the three compounds good candidates for suitable starting materials in a number of synthetic applications.
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45
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Bruno R, Vallejo J, Marino N, De Munno G, Krzystek J, Cano J, Pardo E, Armentano D. Cytosine Nucleobase Ligand: A Suitable Choice for Modulating Magnetic Anisotropy in Tetrahedrally Coordinated Mononuclear CoII Compounds. Inorg Chem 2017; 56:1857-1864. [DOI: 10.1021/acs.inorgchem.6b02448] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Rosaria Bruno
- Dipartimento di
Chimica e Tecnologie Chimiche (CTC), Università della Calabria, 87036 Cosenza, Italy
| | - Julia Vallejo
- Departament de Química
Inorgànica/Instituto de Ciencia Molecular (ICMol), Universitat de València, 46980 Paterna, València, Spain
| | - Nadia Marino
- Dipartimento di
Chimica e Tecnologie Chimiche (CTC), Università della Calabria, 87036 Cosenza, Italy
| | - Giovanni De Munno
- Dipartimento di
Chimica e Tecnologie Chimiche (CTC), Università della Calabria, 87036 Cosenza, Italy
| | - J. Krzystek
- National
High Magnetic Field Laboratory (NHMFL), Florida State University, Tallahassee, Florida 32310, United States
| | - Joan Cano
- Departament de Química
Inorgànica/Instituto de Ciencia Molecular (ICMol), Universitat de València, 46980 Paterna, València, Spain
| | - Emilio Pardo
- Departament de Química
Inorgànica/Instituto de Ciencia Molecular (ICMol), Universitat de València, 46980 Paterna, València, Spain
| | - Donatella Armentano
- Dipartimento di
Chimica e Tecnologie Chimiche (CTC), Università della Calabria, 87036 Cosenza, Italy
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46
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Mao N, Zhang B, Yu F, Chen X, Zhuang GL, Wang Z, Ouyang Z, Zhang T, Li B. Embedding 1D or 2D cobalt–carboxylate substrates in 3D coordination polymers exhibiting slow magnetic relaxation behaviors: crystal structures, high-field EPR, and magnetic studies. Dalton Trans 2017; 46:4786-4795. [DOI: 10.1039/c7dt00168a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel 3D coordination polymer containing 2D cobalt–carboxylate layer had been constructed, exhibiting slow magnetic relaxation.
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Affiliation(s)
- Nannan Mao
- Key laboratory of Material Chemistry for Energy Conversion and Storage
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan
- PR China
| | - Biquan Zhang
- Key laboratory of Material Chemistry for Energy Conversion and Storage
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan
- PR China
| | - Fan Yu
- Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education
- School of Chemical and Environmental Engineering Jianghan University
- Wuhan
- PR China
| | - Xi Chen
- Key laboratory of Material Chemistry for Energy Conversion and Storage
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan
- PR China
| | - Gui-lin Zhuang
- Institute of Industrial Catalysis
- College of Chemical Engineering Zhejiang University of Technology
- Zhejiang
- PR China
| | - Zhenxing Wang
- Wuhan National High Magnetic Field Centre Huazhong University of Science and Technology
- Wuhan
- PR China
| | - Zhongwen Ouyang
- Wuhan National High Magnetic Field Centre Huazhong University of Science and Technology
- Wuhan
- PR China
| | - Tianle Zhang
- Key laboratory of Material Chemistry for Energy Conversion and Storage
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan
- PR China
| | - 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
- PR China
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47
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Zhu YY, Liu F, Liu JJ, Meng YS, Jiang SD, Barra AL, Wernsdorfer W, Gao S. Slow Magnetic Relaxation in Weak Easy-Plane Anisotropy: the Case of a Combined Magnetic and HFEPR Study. Inorg Chem 2016; 56:697-700. [DOI: 10.1021/acs.inorgchem.6b01972] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yuan-Yuan Zhu
- School of Chemistry and Chemical Engineering, Hefei University of Technology and Key Laboratory of Advanced Functional Materials and Devices, Hefei 230009, Anhui Province, China
| | - Fang Liu
- School of Chemistry and Chemical Engineering, Hefei University of Technology and Key Laboratory of Advanced Functional Materials and Devices, Hefei 230009, Anhui Province, China
| | - Jia-Jia Liu
- Beijing National Laboratory for Molecular
Sciences, State Key Laboratory of Rare Earth Materials Chemistry and
Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yin-Shan Meng
- Beijing National Laboratory for Molecular
Sciences, State Key Laboratory of Rare Earth Materials Chemistry and
Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Shang-Da Jiang
- Beijing National Laboratory for Molecular
Sciences, State Key Laboratory of Rare Earth Materials Chemistry and
Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Anne-Laure Barra
- LNCMI-CNRS, 25 rue des Martyrs BP 166, 38042 Grenoble Cedex 9, France
| | - Wolfgang Wernsdorfer
- Institut Néel, CNRS & Université Grenoble Alpes, BP 166, 25 avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Song Gao
- Beijing National Laboratory for Molecular
Sciences, State Key Laboratory of Rare Earth Materials Chemistry and
Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
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48
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Benda L, Mareš J, Ravera E, Parigi G, Luchinat C, Kaupp M, Vaara J. Pseudo-Contact NMR Shifts over the Paramagnetic Metalloprotein CoMMP-12 from First Principles. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201608829] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ladislav Benda
- Institut für Chemie, Theoretische Chemie; Technische Universität Berlin; Sekr. C7, Straße des 17. Juni 135 10623 Berlin Germany
- Institut des Sciences Analytiques; UMR 5280 CNRS/ ENS Lyon/ UCB Lyon 1; 5 rue de la Doua 69100 Villeurbanne France
| | - Jiří Mareš
- NMR Research Unit; University of Oulu; P.O. Box 3000 90014 Oulu Finland
| | - Enrico Ravera
- Magnetic Resonance Center; University of Florence and; Interuniversity Consortium for Magnetic Resonance of Metalloproteins; Sesto Fiorentino Italy
| | - Giacomo Parigi
- Magnetic Resonance Center; University of Florence and; Interuniversity Consortium for Magnetic Resonance of Metalloproteins; Sesto Fiorentino Italy
- Department of Chemistry; University of Florence; Sesto Fiorentino Italy
| | - Claudio Luchinat
- Magnetic Resonance Center; University of Florence and; Interuniversity Consortium for Magnetic Resonance of Metalloproteins; Sesto Fiorentino Italy
- Department of Chemistry; University of Florence; Sesto Fiorentino Italy
| | - Martin Kaupp
- Institut für Chemie, Theoretische Chemie; Technische Universität Berlin; Sekr. C7, Straße des 17. Juni 135 10623 Berlin Germany
| | - Juha Vaara
- NMR Research Unit; University of Oulu; P.O. Box 3000 90014 Oulu Finland
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49
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Benda L, Mareš J, Ravera E, Parigi G, Luchinat C, Kaupp M, Vaara J. Pseudo-Contact NMR Shifts over the Paramagnetic Metalloprotein CoMMP-12 from First Principles. Angew Chem Int Ed Engl 2016; 55:14713-14717. [PMID: 27781358 DOI: 10.1002/anie.201608829] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Indexed: 11/08/2022]
Abstract
Long-range pseudo-contact NMR shifts (PCSs) provide important restraints for the structure refinement of proteins when a paramagnetic metal center is present, either naturally or introduced artificially. Here we show that ab initio quantum-chemical methods and a modern version of the Kurland-McGarvey approach for paramagnetic NMR (pNMR) shifts in the presence of zero-field splitting (ZFS) together provide accurate predictions of all PCSs in a metalloprotein (high-spin cobalt-substituted MMP-12 as a test case). Computations of 314 13 C PCSs using g- and ZFS tensors based on multi-reference methods provide a reliable bridge between EPR-parameter- and susceptibility-based pNMR formalisms. Due to the high sensitivity of PCSs to even small structural differences, local structures based either on X-ray diffraction or on various DFT optimizations could be evaluated critically by comparing computed and experimental PCSs. Many DFT functionals provide insufficiently accurate structures. We also found the available 1RMZ PDB X-ray structure to exhibit deficiencies related to binding of a hydroxamate inhibitor. This has led to a newly refined PDB structure for MMP-12 (5LAB) that provides a more accurate coordination arrangement and PCSs.
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Affiliation(s)
- Ladislav Benda
- Institut für Chemie, Theoretische Chemie, Technische Universität Berlin, Sekr. C7, Straße des 17. Juni 135, 10623, Berlin, Germany.,Institut des Sciences Analytiques, UMR 5280 CNRS/ ENS Lyon/ UCB Lyon 1, 5 rue de la Doua, 69100, Villeurbanne, France
| | - Jiří Mareš
- NMR Research Unit, University of Oulu, P.O. Box 3000, 90014, Oulu, Finland
| | - Enrico Ravera
- Magnetic Resonance Center, University of Florence and, Interuniversity Consortium for Magnetic Resonance of Metalloproteins, Sesto Fiorentino, Italy
| | - Giacomo Parigi
- Magnetic Resonance Center, University of Florence and, Interuniversity Consortium for Magnetic Resonance of Metalloproteins, Sesto Fiorentino, Italy.,Department of Chemistry, University of Florence, Sesto Fiorentino, Italy
| | - Claudio Luchinat
- Magnetic Resonance Center, University of Florence and, Interuniversity Consortium for Magnetic Resonance of Metalloproteins, Sesto Fiorentino, Italy.,Department of Chemistry, University of Florence, Sesto Fiorentino, Italy
| | - Martin Kaupp
- Institut für Chemie, Theoretische Chemie, Technische Universität Berlin, Sekr. C7, Straße des 17. Juni 135, 10623, Berlin, Germany
| | - Juha Vaara
- NMR Research Unit, University of Oulu, P.O. Box 3000, 90014, Oulu, Finland
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Vaidya S, Tewary S, Singh SK, Langley SK, Murray KS, Lan Y, Wernsdorfer W, Rajaraman G, Shanmugam M. What Controls the Sign and Magnitude of Magnetic Anisotropy in Tetrahedral Cobalt(II) Single-Ion Magnets? Inorg Chem 2016; 55:9564-9578. [DOI: 10.1021/acs.inorgchem.6b01073] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shefali Vaidya
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Subrata Tewary
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Saurabh Kumar Singh
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Stuart K. Langley
- School
of Science and the Environment, Chemistry Division, Manchester Metropolitan University, Manchester M15 6HB, U.K
| | - Keith S. Murray
- School
of Chemistry, Monash University, Clayton 3800, Victoria, Australia
| | - Yanhua Lan
- Institut
Néel, CNRS and Université Grenoble Alpes, BP 166,
25 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Wolfgang Wernsdorfer
- Institut
Néel, CNRS and Université Grenoble Alpes, BP 166,
25 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Gopalan Rajaraman
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Maheswaran Shanmugam
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
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