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Jo M, Amanyazova B, Yergeshbayeva S, Gakiya-Teruya M, Üngör Ö, Lopez Rivera P, Jen N, Lukyanenko E, Kurkin AV, Erkasov R, Meisel MW, Hauser A, Chakraborty P, Shatruk M. Light-induced spin-state switching in Fe(II) spin-crossover complexes with thiazole-based chelating ligands. Dalton Trans 2024. [PMID: 38841884 DOI: 10.1039/d4dt00308j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2024]
Abstract
Homoleptic complexes [Fe(4bt)3](ClO4)2 (1), [Fe(2bt)3](ClO4)2 (2), and [Fe(3tpH)3](ClO4)2 (3) were obtained by a reaction between the Fe(II) precursor salt and the corresponding thiazole-based bidentate ligand (L = 4bt = 4,4'-bithiazole, 2bt = 2,2'-bithiazole, 3tpH = 3-(thiazol-2-yl)pyrazole). X-ray crystal structure determination revealed crystallization of solvent-free complex 1, a solvate 2·MeOH, and a co-crystal 3·2(3tpH). The crystal packing of all these complexes is dominated by one-dimensional interactions between the [Fe(L)3]2+ cations. These interactions are stronger in 2·MeOH and 3·2(3tpH), leading to cooperative and slightly hysteretic transitions between the high-spin and low-spin electronic configurations at ∼235 K and 159 K, respectively. In contrast, weaker intermolecular interactions in 1 result in a gradual spin crossover above 300 K, with the maximum fraction of the HS state ∼25% achieved at 400 K. Complexes 2 and 3·2(3tpH) exhibit light-induced excited spin state trapping (LIESST) under irradiation with white light or a 532 nm laser at 5 K. After the photoexcitation, the trapped metastable HS state relaxes to the ground LS state with the average relaxation temperature of 81 K and 68 K, respectively. Examination of the relaxation dynamics by optical absorption spectroscopy on a single crystal of 3·2(3tpH) revealed the sigmoidal shape of the relaxation curves at lower temperatures, attributed to cooperative effects, as well as a plateau at ∼10% of the HS fraction at intermediate temperatures, hinting at a more complex mechanism for the relaxation of the LIESST phase in this material.
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Affiliation(s)
- Minyoung Jo
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA.
| | - Botagoz Amanyazova
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA.
- Department of Chemistry, L.N. Gumilyov Eurasian National University, Astana 010008, Kazakhstan
| | - Sandugash Yergeshbayeva
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA.
| | - Miguel Gakiya-Teruya
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA.
| | - Ökten Üngör
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA.
| | - Paola Lopez Rivera
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA.
- Department of Chemistry, University of Puerto Rico at Humacao, Humacao, PR 00792, Puerto Rico
| | - Natalie Jen
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA.
| | - Evgeny Lukyanenko
- Department of Chemistry, Lomonosov Moscow State University, Moscow, 119234, Russia
| | - Alexander V Kurkin
- Department of Chemistry, Lomonosov Moscow State University, Moscow, 119234, Russia
| | - Rakhmetulla Erkasov
- Department of Chemistry, L.N. Gumilyov Eurasian National University, Astana 010008, Kazakhstan
| | - Mark W Meisel
- Department of Physics and National High Magnetic Field Laboratory, University of Florida, Gainesville, Florida 32611, USA
| | - Andreas Hauser
- Department of Physical Chemistry, University of Geneva, CH-1211, Geneva 4, Switzerland
| | - Pradip Chakraborty
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India.
| | - Michael Shatruk
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA.
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Spitsyna NG, Ovanesyan NS, Blagov MA. A Comparative Study of Nitrate and Iodide of the Spin-Variable Iron(III) Cation with the N4O2 Coordination Sphere by Mössbauer Spectroscopy. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2022. [DOI: 10.1134/s1990793122040157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Vorobeva V, Starichenko D, Gruzdev M, Chervonova U, Zaripov R, Korolev A. Magnetic properties of the mononuclear iron (III) complexes with biphenyl‐disubstituted Schiff base ligand: EPR and SQUID study. Appl Organomet Chem 2022. [DOI: 10.1002/aoc.6748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Valerya Vorobeva
- Department of Chemical Physics, Zavoisky Physical‐Technical Institute, FRC Kazan Scientific Center of Russian Academy of Sciences Kazan Russian Federation
| | - Denis Starichenko
- Department of Nanospintronics, Electrical Phenomena Laboratory, M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences Ekaterinburg Russian Federation
| | - Matvey Gruzdev
- Laboratory of Structure and dynamics of molecular and ion‐molecular solutions, G.A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences Ivanovo Russian Federation
| | - Ulyana Chervonova
- Laboratory of Structure and dynamics of molecular and ion‐molecular solutions, G.A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences Ivanovo Russian Federation
| | - Ruslan Zaripov
- Department of Chemical Physics, Zavoisky Physical‐Technical Institute, FRC Kazan Scientific Center of Russian Academy of Sciences Kazan Russian Federation
| | - Aleksandr Korolev
- Department of magnetic measurements, M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences Ekaterinburg Russian Federation
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