Iron(III) spin transition compound with a large thermal hysteresis |
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| Authors: | S Hayami T Kawahara G Juhász K Kawamura K Uehashi O Sato Y Maeda |
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| Institution: | (1) Department of Chemistry, Faculty of Science, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan;(2) Budapest Department of Chemistry, Faculty of Science, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan;(3) Special Research Laboratory for Optical Science, Kanagawa Academy of Science and Technology, East 412, 3-2-1 Sakado, Takatsu-ku, Kawasaki-shi, Kanagawa, 213-0012, Japan;(4) Department of Chemistry, Faculty of Science, Kyushu University Graduate School of Sciences, Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan |
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| Abstract: | The magnetic properties of the spin-crossover compound, Fe(qsal)2]NCSe·2DMSO (N-(8-quinolyl)-salicyladimine) (1), have been measured. We have discovered that the compound 1 exhibits a wide "thermal hysteresis loop" of 115 K (T1/2 = 324 K and T1/2 = 209 K) in the first cycle. Thermogravimetric analysis shows that solvent molecules of the compound 1 are removed at around 324 K. This means that the hysteresis loop observed for the first cycle is only an apparent one. Following the first loop, the compound 1 shows a spin-crossover in warming mode. The spin transition occurs at T1/2= 285 K and T1/2 = 209 K and the hysteresis width can be estimated to be 76 K, which is one of the largest values reported so far for spin-crossover compounds. It is thought that the cooperativity produced in the compound mainly arises from the intermolecular  interactions between the quinoline and the phenyl rings. |
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