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Issue 10, 2019
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Substituent dependence on the spin crossover behaviour of mononuclear Fe(ii) complexes with asymmetric tridentate ligands†

Ryo Saiki,a   Haruka Miyamoto,a   Hajime Sagayama,b   Reiji Kumai, ORCID logo b   Graham N. Newton, ORCID logo c   Takuya Shiga ORCID logo *a  and  Hiroki Oshio ORCID logo *a  
Author affiliations

* Corresponding authors

a Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8571, Japan
E-mail: shiga@chem.tsukuba.ac.jp, oshio@chem.tsukuba.ac.jp

b Photon Factory and Condensed Matter Research Center, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Oho 1-1, Tsukuba, Ibaraki 305-0801, Japan

c GSK Carbon Neutral Laboratories for Sustainable Chemistry, The University of Nottingham, Nottingham, UK

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 = 2,3,4,5,6-pentamethylphenyl) (1, H2L1; 2, H2L2; 3, H2L3) with asymmetric tridentate ligands (H2L1–3) were synthesized and their structures and magnetic behaviour 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.

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

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Article information

https://doi.org/10.1039/C9DT00204A
Submitted
15 Jan 2019
Accepted
29 Jan 2019
First published
05 Feb 2019
Dalton Trans., 2019,48, 3231-3236
Article type
Paper
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Substituent dependence on the spin crossover behaviour of mononuclear Fe(II) complexes with asymmetric tridentate ligands

R. Saiki, H. Miyamoto, H. Sagayama, R. Kumai, G. N. Newton, T. Shiga and H. Oshio, Dalton Trans., 2019, 48, 3231
DOI: 10.1039/C9DT00204A

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