Substituent dependence on the spin crossover behaviour of mononuclear Fe(ii) complexes with asymmetric tridentate ligands

Saiki, Ryo; Miyamoto, Haruka; Sagayama, Hajime; Kumai, Reiji; Newton, Graham N.; Shiga, Takuya; Oshio, Hiroki

Abstract

Three mononuclear iron(II) complexes of the formula [FeII(H2L1-3)2](BF4)2.x(solv.) (H2L1-3 = 2-[5-(R-phenyl)-1H-pyrazole-3-yl] 6-benzimidazole pyridine; H2L1: R = 4-methylphenyl, H2L2, R = 2,4,6-trimethylphenyl, H2L3, R = 2,3,4,5,6pentamethylphenyl) (1, H2L1; 2, H2L2; 3, H2L3) with asymmetric tridentate ligands (H2L1-3) were synthesized and their structures and magnetic behaivor investigated. Significant structural distortions of the dihedral angles between phenyl and pyrazole groups were observed and found to depend on the nature of the substituent groups. Cryomagnetic studies reveal that 1 and 2 show gradual spin crossover behavior, while 3 remains in the high spin state between 1.8 and 300 K.

Citation

Saiki, R., Miyamoto, H., Sagayama, H., Kumai, R., Newton, G. N., Shiga, T., & Oshio, H. (2019). Substituent dependence on the spin crossover behaviour of mononuclear Fe(ii) complexes with asymmetric tridentate ligands. Dalton Transactions, 48(10), 3231-3236. https://doi.org/10.1039/c9dt00204a

• Journal Article Type: Article
• Acceptance Date: Jan 29, 2019
• Online Publication Date: Feb 5, 2019
• Publication Date: Feb 5, 2019
• Deposit Date: Mar 15, 2019
• Publicly Available Date: Feb 6, 2020
• Journal: Dalton Transactions
• Print ISSN: 1477-9226
• Electronic ISSN: 1477-9234
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 48
• Issue: 10
• Pages: 3231-3236
• DOI: https://doi.org/10.1039/c9dt00204a
• Keywords: Inorganic Chemistry
• Public URL: https://nottingham-repository.worktribe.com/output/1655607
• Publisher URL: https://pubs.rsc.org/en/Content/ArticleLanding/2019/DT/C9DT00204A#!divAbstract