Multistep Changes in Spin-Crossover Temperature Induced by Stepwise Desolvations
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Updated: Aug 6, 2026

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
Published on: May 15, 2017
Taisei Suzuki1, Takuya Shiga1, Natsumi Okawa1
1Degree Programs in Pure and Applied Sciences, Graduate School of Science and Technology, University of Tsukuba, Tsukuba, Ibaraki, Japan.
Abstract:
Lattice solvents significantly influence spin-crossover (SCO) behavior, while multistep changes induced by stepwise desolvations are rarely reported. Herein, we report a novel Fe(II) SCO complex, [Fe(H2L)2](BF4)2·3VN (1·3VN, H2L = 2,6-bis(5-phenyl-1H-pyrazol-3-yl)pyridine, VN = valeronitrile), shows non-monotonic changes in spin transition temperature (T1/2) upon stepwise desolvation of VN molecules. A conversion from 1·3VN to 1·2VN increases T1/2 and slightly enhances hysteresis. In contrast, further desolvated 1·VN shows partial SCO with significantly decreased T1/2 and enhanced hysteresis. Structural investigations revealed that the multistep changes in T1/2 values can be explained by significant alterations of the intermolecular interactions between VN molecules and 1.
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