Multistep Changes in Spin‐Crossover Temperature Induced by Stepwise Desolvations
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(H 2 L) 2 ](BF 4 ) 2 ·3VN ( 1·3VN , H 2 L = 2,6‐bis(5‐phenyl‐1 H ‐pyrazol‐3‐yl)pyridine, VN = valeronitrile), shows non‐monotonic changes in spin transition temperature ( T 1/2 ) upon stepwise desolvation of VN molecules. A conversion from 1·3VN to 1·2VN increases T 1/2 and slightly enhances hysteresis. In contrast, further desolvated 1·VN shows partial SCO with significantly decreased T 1/2 and enhanced hysteresis. Structural investigations revealed that the multistep changes in T 1/2 values can be explained by significant alterations of the intermolecular interactions between VN molecules and 1 .
Authors
- Nozomi Mihara (ORCID: https://orcid.org/0000-0001-8977-5619)
- Taisei Suzuki (ORCID: https://orcid.org/0009-0002-4708-4136)
- Daisuke Okuyama (ORCID: https://orcid.org/0000-0001-8709-5177)
- Takuya Shiga (ORCID: https://orcid.org/0000-0002-6834-6011)
- Kevin Tran (ORCID: https://orcid.org/0000-0003-3693-4537)
- Franz Renz (ORCID: https://orcid.org/0000-0003-1494-1242)
- Masayuki Nihei (ORCID: https://orcid.org/0000-0002-3461-0187)
- Reiji Kumai (ORCID: https://orcid.org/0000-0002-5320-0028)
- Maximilian Seydi Kilic (ORCID: https://orcid.org/0009-0007-7173-1459)
- Natsumi Okawa
- Hajime Sagayama (ORCID: https://orcid.org/0000-0003-3816-9584)
Institutions
- Leibniz University Hannover (DE)
- High Energy Accelerator Research Organization (JP)
- University of Tsukuba (JP)
- Tsukuba University of Technology (JP)
- Nagoya Gakuin University (JP)
Publication Details
- Journal
- Chemistry - A European Journal
- Published
- 2026-07-18
- DOI
- https://doi.org/10.1002/chem.71440
- Primary Topic
- Magnetism in coordination complexes
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Asahi Glass Foundation
- Iwatani Naoji Foundation
- Hitachi Global Foundation
- Japan Society for the Promotion of Science