1. Electron transfer coupled spin transition in cyano-bridged mixed-valence {FeIII2FeII2} molecular squares.
- Author
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Jia, Shuwen, Shang, Mengjia, Jin, Sai, Zhu, Xinrui, Cai, Yuanyuan, and Li, Dongfeng
- Subjects
SPIN crossover ,CHARGE exchange ,VALENCE fluctuations ,TRANSITION metal ions ,MAGNETIC measurements - Abstract
The research on electron transfer coupled spin transition regulating the valence state and spin state transition of metal ions is promising and challenging. Herein, we report a cyano-bridged {Fe
III 2 FeII 2 } molecular square complex, {[Fe(Tp)(CN)3 ]2 [Fe(bnbpen)]2 }(ClO4 )2 ·8CH3 OH (1·8CH3 OH, bnbpen = N,N′-bis-(2-naphthylmethyl)-N,N′-bis(2-picolayl)-ethylenediamine), and its free of solvents form (1). Combined single-crystal X-ray diffraction, temperature-dependent infrared (IR) spectra, magnetic measurements, and Mössbauer spectra reveal that 1·8CH3 OH and 1 exhibit reversible one-step and two-step electron transfer coupled spin transition (ETCST) with temperature change, between the low-temperature state {FeII,LS (μ-CN)FeIII,LS }2 (LS = low spin, HS = high spin) and the high-temperature state {FeIII,LS (μ-CN)FeII,HS }2 , respectively. [ABSTRACT FROM AUTHOR]- Published
- 2024
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