NDLI: Room-temperature switching of magnetic hysteresis by reversible single-crystal-to-single-crystal solvent exchange in imidazole-inspired Fe(II) complexes

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Shen, Fuxing Sato, Osamu Pan, Feifei Wu, Dayu Huang, Wei Zhang, Ming
Description	Author Affiliation: Huang W ( Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Collaborative Innovation Center of Advanced Catalysis & Green Manufacturing, School of Petrochemical Engineering, Changzhou University, Changzhou, Jiangsu 213164, China. wudy@cczu.edu.cn.)
Abstract	The recent upsurge in molecular magnetism reflects its application in the areas of sensors and molecular switches. Thermal hysteresis is crucial to the molecular bistability and information storage, a wide hysteresis near room temperature is expected to be of practical sense for the molecular compound. In this work, spin crossover iron(II) complexes $[Fe(Liq)_{2}](BF_{4})_{2}·(CH_{3}CH_{2})_{2}O$ $(1-Et_{2}O)$ and $[Fe(Liq)_{2}](BF_{4})_{2}·3H_{2}O$ $(1-3H_{2}O)$ were prepared and structurally and magnetically analysed. The single-crystal-to-single-crystal (SCSC) solvation transformation and the influence on the crystal structures and magnetic hysteresis were investigated in an etherification–hydration cycle. At room temperature, X-ray diffraction experiments indicated a transformation from one crystal $(1-Et_{2}O,$ $P2_{1}2_{1}2)$ to another crystal $(1-3H_{2}O,$ $P2_{1}2_{1}2_{1})$ upon humidity exposure and reversible recovery of its crystallinity upon exposure to ether vapor. The etherified phase $1-Et_{2}O$ exhibits room temperature spin crossover $(T_{1/2}$ = 305 K) but negligible thermal hysteresis, however the hydrated phase $1-3H_{2}O$ exhibits the apparent hysteresis loop $(T_{1/2}↑$ = 346 K, $T_{1/2}↓$ = 326 K) which expands to room temperature. This effect is associated with the change of intermolecular cooperativity in the etherification–hydration recyclability.
ISSN	14779226
Issue Number	38
Journal	Dalton Trans.
Volume Number	45
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2016-10-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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