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

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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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Publication details

The article was received on 15 Jan 2019, accepted on 29 Jan 2019 and first published on 05 Feb 2019


Article type: Paper
DOI: 10.1039/C9DT00204A
Citation: Dalton Trans., 2019, Advance Article

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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, Advance Article , DOI: 10.1039/C9DT00204A

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