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Bagchi S, Kamilya S, Mehta S, Mandal S, Bandyopadhyay A, Narayan A, Ghosh S, Mondal A. Spin-state switching: chemical modulation and the impact of intermolecular interactions in manganese(III) complexes. Dalton Trans 2023; 52:11335-11348. [PMID: 37530419 DOI: 10.1039/d3dt01707a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/03/2023]
Abstract
A series of mononuclear manganese(III) complexes [Mn(X-sal2-323)](ReO4) (X = 5 Cl, 1; X = 5 Br, 2; X = 3,5 Cl, 3; X = 3,5 Br, 4; and X = 5 NO2, 5), containing hexadentate ligands prepared using the condensation of N,N'-bis(3-aminopropyl)ethylenediamine and 5- or 3,5-substituted salicylaldehyde, has been synthesized. Variable temperature single-crystal X-ray diffraction, magnetic, spectroscopic, electrochemical, and spectroelectrochemical analyses, and theoretical calculations have been used to explore the role of various ligand substituents in the spin-state switching behavior of the prepared manganese(III) complexes. All five complexes consist of an analogous distorted octahedral monocationic MnN4O2 surrounding offered by the flexible hexadentate ligand and ReO4- as the counter anion. However, a disordered water molecule was detected in complex 4. Complexes 1 (X = 5 Cl) and 5 (X = 5 NO2) show gradual and complete spin-state switching between the high-spin (HS) (S = 2) and the low-spin (LS) (S = 1) state with T1/2 values of 146 and 115 K respectively, while an abrupt and complete transition at 95 K was observed for complex 2 (X = 5 Br). Alternatively, complex 3 (X = 3, 5 Cl) exhibits an incomplete and sharp transition between the HS and LS states at 104 K, while complex 4 (X = 3, 5 Br) (desolvated) remains almost LS up to 300 K and then displays gradual and incomplete SCO at a higher temperature. The nature of the spin-state switch and transition temperature suggest that the structural effect (cooperativity) plays a more significant role in comparison with the electronic effect coming from various substituents (Cl, Br, and NO2), which is further supported by the detailed structural, electrochemical, and theoretical studies.
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Affiliation(s)
- Sukanya Bagchi
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India.
| | - Sujit Kamilya
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India.
| | - Sakshi Mehta
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India.
| | - Subhankar Mandal
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India.
| | - Arka Bandyopadhyay
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India.
| | - Awadhesh Narayan
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India.
| | - Subrata Ghosh
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India.
| | - Abhishake Mondal
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India.
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2
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Kelly CT, Jordan R, Felton S, Müller‐Bunz H, Morgan GG. Spontaneous Chiral Resolution of a Mn III Spin-Crossover Complex with High Temperature 80 K Hysteresis. Chemistry 2023; 29:e202300275. [PMID: 37037023 PMCID: PMC10946779 DOI: 10.1002/chem.202300275] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 04/03/2023] [Accepted: 04/04/2023] [Indexed: 04/12/2023]
Abstract
Non-centrosymmetric spin-switchable systems are of interest for their prospective applications as magnetically active non-linear optical materials and in multiferroic devices. Chiral resolution of simple spin-crossover chelate complexes into the Δ and Λ forms offers a facile route to homochiral magnetic switches, which could be easily enantiomerically enriched. Here, we report the spontaneous resolution of a new hysteretic spin-crossover complex, [MnIII (sal2 323)]SCN ⋅ EtOH (1), into Δ and Λ forms, without the use of chiral reagents, where sal2 323 is a Schiff base resulting from condensation of 1,2-bis(3-aminopropylamino)ethane with 2-hydroxybenzaldehyde. The enantiopurity of the Δ and Λ isomers was confirmed by single crystal X-ray diffraction and circular dichroism. Quantum chemistry calculations were used to investigate the electronic structure. The opening of a wide 80 K thermal hysteresis window at high temperature highlights the potential for good magneto-optical function at ambient temperature for materials of this type.
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Affiliation(s)
- Conor T. Kelly
- School of ChemistryUniversity College DublinBelfield, Dublin 4Ireland
| | - Ross Jordan
- Centre for Quantum Materials and TechnologiesSchool of Mathematics and PhysicsQueen's University BelfastBelfastBT7 1NNUK
| | - Solveig Felton
- Centre for Quantum Materials and TechnologiesSchool of Mathematics and PhysicsQueen's University BelfastBelfastBT7 1NNUK
| | - Helge Müller‐Bunz
- School of ChemistryUniversity College DublinBelfield, Dublin 4Ireland
| | - Grace G. Morgan
- School of ChemistryUniversity College DublinBelfield, Dublin 4Ireland
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3
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Harris M, Kühne IA, Kelly CT, Jakobsen VB, Jordan R, O’Brien L, Müller-Bunz H, Felton S, Morgan GG. Compressed and Expanded Lattices - Barriers to Spin-State Switching in Mn 3+ Complexes. CRYSTAL GROWTH & DESIGN 2023; 23:3996-4012. [PMID: 37304401 PMCID: PMC10251414 DOI: 10.1021/acs.cgd.2c01284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 05/08/2023] [Indexed: 06/13/2023]
Abstract
We report the structural and magnetic properties of two new Mn3+ complex cations in the spin crossover (SCO) [Mn(R-sal2323)]+ series, in lattices with seven different counterions in each case. We investigate the effect on the Mn3+ spin state of appending electron-withdrawing and electron-donating groups on the phenolate donors of the ligand. This was achieved by substitution of the ortho and para positions on the phenolate donors with nitro and methoxy substituents in both possible geometric isomeric forms. Using this design paradigm, the [MnL1]+ (a) and [MnL2]+ (b) complex cations were prepared by complexation of Mn3+ to the hexadentate Schiff base ligands with 3-nitro-5-methoxy-phenolate or 3-methoxy-5-nitro-phenolate substituents, respectively. A clear trend emerges with adoption of the spin triplet form in complexes 1a-7a, with the 3-nitro-5-methoxy-phenolate donors, and spin triplet, spin quintet and thermal SCO in complexes 1b-7b with the 3-methoxy-5-nitro-phenolate ligand isomer. The outcomes are discussed in terms of geometric and steric factors in the 14 new compounds and by a wider analysis of electronic choices of Mn3+ with related ligands by comparison of bond length and angular distortion data of previously reported analogues in the [Mn(R-sal2323)]+ family. The structural and magnetic data published to date suggest a barrier to switching may exist for high spin forms of Mn3+ in those complexes with the longest bond lengths and highest distortion parameters. A barrier to switching from low spin to high spin is less clear but may operate in the seven [Mn(3-NO2-5-OMe-sal2323)]+ complexes 1a-7a reported here which were all low spin in the solid state at room temperature.
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Affiliation(s)
- Michelle
M. Harris
- School
of Chemistry, University College Dublin, Belfield, Dublin, D04
V1W8, Ireland
| | - Irina A. Kühne
- School
of Chemistry, University College Dublin, Belfield, Dublin, D04
V1W8, Ireland
- Department
of Functional Materials, FZU - Institute
of Physics - Czech Academy of Sciences, Na Slovance 1999/2, Prague
8, 182 21, Czech Republic
| | - Conor T. Kelly
- School
of Chemistry, University College Dublin, Belfield, Dublin, D04
V1W8, Ireland
| | - Vibe B. Jakobsen
- School
of Chemistry, University College Dublin, Belfield, Dublin, D04
V1W8, Ireland
| | - Ross Jordan
- Centre
for Quantum Materials and Technologies, School of Mathematics and
Physics, Queen’s University Belfast, Belfast BT7 1NN, United Kingdom
| | - Luke O’Brien
- School
of Chemistry, University College Dublin, Belfield, Dublin, D04
V1W8, Ireland
| | - Helge Müller-Bunz
- School
of Chemistry, University College Dublin, Belfield, Dublin, D04
V1W8, Ireland
| | - Solveig Felton
- Centre
for Quantum Materials and Technologies, School of Mathematics and
Physics, Queen’s University Belfast, Belfast BT7 1NN, United Kingdom
| | - Grace G. Morgan
- School
of Chemistry, University College Dublin, Belfield, Dublin, D04
V1W8, Ireland
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4
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Qin CY, Zhao SZ, zhou HW, Li YH, Wang S. Effect of halogen substituents on the intermolecular interactions and magnetic properties of Mn(III) complexes. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.115896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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5
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Tiunova AV, Kazakova AV, Korchagin DV, Shilov GV, Zakharov KV, Vasiliev AN, Yagubskii EB. The effect of fluorine substituents on the crystal structure and spin crossover behavior of the cation [Mn III(3,5-diHal-sal 2323)] + complex family with BPh 4 anions. NEW J CHEM 2022. [DOI: 10.1039/d2nj02872g] [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 effect of fluorine substituents on the structure and magnetic behavior of [Mn(R′,R′′-sal2323)]BPh4 complexes was studied and compared it with that of chlorine and bromine substituents.
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Affiliation(s)
- A. V. Tiunova
- Lomonosov Moscow State University, 119991 Moscow, Russia
- Institute of Problems of Chemical Physics RAS, 142432 Chernogolovka, MD, Russia
| | - A. V. Kazakova
- Institute of Problems of Chemical Physics RAS, 142432 Chernogolovka, MD, Russia
| | - D. V. Korchagin
- Institute of Problems of Chemical Physics RAS, 142432 Chernogolovka, MD, Russia
| | - G. V. Shilov
- Institute of Problems of Chemical Physics RAS, 142432 Chernogolovka, MD, Russia
| | - K. V. Zakharov
- Lomonosov Moscow State University, 119991 Moscow, Russia
| | - A. N. Vasiliev
- Lomonosov Moscow State University, 119991 Moscow, Russia
- National University of Science and Technology “MISiS”, 119049 Moscow, Russia
| | - E. B. Yagubskii
- Institute of Problems of Chemical Physics RAS, 142432 Chernogolovka, MD, Russia
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6
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Jakobsen VB, Trzop E, Dobbelaar E, Gavin LC, Chikara S, Ding X, Lee M, Esien K, Müller-Bunz H, Felton S, Collet E, Carpenter MA, Zapf VS, Morgan GG. Domain Wall Dynamics in a Ferroelastic Spin Crossover Complex with Giant Magnetoelectric Coupling. J Am Chem Soc 2021; 144:195-211. [PMID: 34939802 PMCID: PMC8759087 DOI: 10.1021/jacs.1c08214] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
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Pinned and mobile
ferroelastic domain walls are detected in response
to mechanical stress in a Mn3+ complex with two-step thermal
switching between the spin triplet and spin quintet forms. Single-crystal
X-ray diffraction and resonant ultrasound spectroscopy on [MnIII(3,5-diCl-sal2(323))]BPh4 reveal three
distinct symmetry-breaking phase transitions in the polar space group
series Cc → Pc → P1 → P1(1/2). The transition mechanisms involve coupling between structural and
spin state order parameters, and the three transitions are Landau
tricritical, first order, and first order, respectively. The two first-order
phase transitions also show changes in magnetic properties and spin
state ordering in the Jahn–Teller-active Mn3+ complex.
On the basis of the change in symmetry from that of the parent structure, Cc, the triclinic phases are also ferroelastic, which has
been confirmed by resonant ultrasound spectroscopy. Measurements of
magnetoelectric coupling revealed significant changes in electric
polarization at both the Pc → P1 and P1 → P1(1/2) transitions, with opposite signs. All these phases are polar, while P1 is also chiral. Remanent electric polarization was detected
when applying a pulsed magnetic field of 60 T in the P1→ P1(1/2) region of bistability
at 90 K. Thus, we showcase here a rare example of multifunctionality
in a spin crossover material where the strain and polarization tensors
and structural and spin state order parameters are strongly coupled.
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Affiliation(s)
- Vibe Boel Jakobsen
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Elzbieta Trzop
- Univ Rennes, CNRS, IPR (Institut de Physique de Rennes)-UMR 6251, F-35000 Rennes, France
| | - Emiel Dobbelaar
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Laurence C Gavin
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Shalinee Chikara
- Department of Physics, Auburn University Auburn, Alabama 36849, United States
| | - Xiaxin Ding
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Minseong Lee
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Kane Esien
- Centre for Nanostructured Media, School of Mathematics and Physics, Queen's University of Belfast, Belfast BT7 1NN, Northern Ireland, United Kingdom
| | - Helge Müller-Bunz
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Solveig Felton
- Centre for Nanostructured Media, School of Mathematics and Physics, Queen's University of Belfast, Belfast BT7 1NN, Northern Ireland, United Kingdom
| | - Eric Collet
- Univ Rennes, CNRS, IPR (Institut de Physique de Rennes)-UMR 6251, F-35000 Rennes, France
| | - Michael A Carpenter
- Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, England, United Kingdom
| | - Vivien S Zapf
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Grace G Morgan
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
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