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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

Authors

Ryo Saiki

Haruka Miyamoto

Hajime Sagayama

Reiji Kumai

Takuya Shiga

Hiroki Oshio



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.

Journal Article Type Article
Publication Date Feb 5, 2019
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
APA6 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
DOI https://doi.org/10.1039/c9dt00204a
Keywords Inorganic Chemistry
Publisher URL https://pubs.rsc.org/en/Content/ArticleLanding/2019/DT/C9DT00204A#!divAbstract

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