Iron(II) spin crossover complexes with branched long alkyl chain

• Published in: Polyhedron Vol. 30; no. 18; pp. 3001 - 3005
• Main Authors: Lee, Young Hoon, Ohta, Asuka, Yamamoto, Yuki, Komatsu, Yasuka, Kato, Kazuya, Shimizu, Tetsuya, Shinoda, Hideaki, Hayami, Shinya
• Format: Journal Article
• Language: English
• Published: OXFORD Elsevier Ltd 28.11.2011; Elsevier
• Subjects: Chemistry; Chemistry, Inorganic & Nuclear; Crystallography; Iron(II) complex; Liquid crystal; Long alkyl chain; Physical Sciences; Science & Technology; Spin crossover; Iron(II) complex; Long alkyl chain; Spin crossover; TRANSITION; Long alkyl chain, Liquid crystal; STATE
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2011.02.015

The bzimpy iron(II) complexes with branched long alkyl chains were synthesized. They show gradual or abrupt spin crossover behavior from low spin to high spin states and liquid crystal phase transitions. [Display omitted] ► The novel bzimpy iron(II) complexes with branched long alkyl chains. The complexes for synchronization between crystal-mesophase transition and spin crossover behavior. Compound 3 shows abrupt spin transition with the thermal hysteresis. The bzimpy iron(II) complexes, 1– 3, containing branched long alkyl chains were synthesized and characterized in detail. The temperature-dependant magnetic susceptibility of 1 showed gradual spin crossover behavior from low spin to high spin state, while 2 retained only low spin state in the same condition. Interestingly, 3 displayed an abrupt spin transition in temperature range from T 1/2↑ = 236 K to T 1/2↓ = 230 K with the thermal hysteresis loop about 6 K. The differential scanning calorimetric analysis of 3 revealed two species of liquid crystal phase transitions at 236 K and 351 K, respectively.