ON/OFF Photo(switching) along with Reversible Spin-State Change and Single-Crystal-to-Single-Crystal Transformation in a Mixed-Valence Fe(II)Fe(III) Molecular System
journal contribution
posted on 2023-03-03, 15:05 authored by Sujit Kamilya, Sakshi Mehta, Mohini Semwal, Rodrigue Lescouëzec, Yanling Li, Jiri Pechousek, Varimalla R. Reddy, Eric Rivière, Mathieu Rouzières, Abhishake MondalA mixed-valence Fe(II)Fe(III) molecular system, {[Fe(pzTp)(CN)3]2[Fe(bik)2]2}·[Fe(pzTp)(CN)3]2·4MeOH (1·4MeOH) (bik
= bis-(1-methylimidazolyl)-2-methanone, pzTp = tetrakis(pyrazolyl)borate),
exhibits single-crystal-to-single-crystal (SC–SC) transformation
while increasing the temperature and is converted into {[Fe(pzTp)(CN)3]2[Fe(bik)2]2}·[Fe(pzTp)(CN)3]2 (1). Both complexes exhibit thermo-induced
spin-state switching behavior along with reversible SC–SC transformation,
where the low-temperature [FeIIILSFeIILS]2 phase transforms into a high-temperature
[FeIIILSFeIIHS]2 phase. 1·4MeOH exhibits an abrupt spin-state switching
with T1/2 at 355 K, whereas 1 undergoes a gradual and reversible spin-state switching with a lower T1/2 at 338 K. Astonishingly, 1 exhibits
ON/OFF photo-induced spin-state switching with TLIESST = 67 K, whereas 1·4MeOH does not show
such an effect.
