Masataka Koike scite author profile

The solvent-free spin crossover iron(III) complex [Fe(III)(Him)2(hapen)]AsF6 (Him = imidazole, H2hapen = N,N'-bis(2-hydroxyacetophenylidene)ethylenediamine), exhibiting thermal hysteresis, was synthesized and characterized. The Fe(III) ion has an octahedral coordination geometry, with N2O2 donor atoms of the planar tetradentate ligand (hapen) and two nitrogen atoms of two imidazoles at the axial positions. One of two imidazoles is hydrogen-bonded to the phenoxo oxygen atom of hapen of the adjacent unit to give a hydrogen-bonded one-dimensional chain, while the other imidazole group is free from hydrogen bonding. The temperature dependencies of the magnetic susceptibilities and Mössbauer spectra revealed an abrupt spin transition between the high-spin (S = 5/2) and low-spin (S = 1/2) states, with thermal hysteresis.

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Syntheses, hydrogen-bonded assembly structures, and spin crossover properties of [FeIII(Him)2(n-MeOhapen)]PF6 (Him=imidazole and n-MeOhapen=N,N′-bis(n-methoxy-2-oxyacetophenylidene)ethylenediamine); n=4, 5, 6)

Fujinami

Ikeda

Koike

et al. 2015

Inorganica Chimica Acta

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Masataka Koike

Syntheses, three types of hydrogen-bonded assembly structures, and magnetic properties of [FeIII(Him)2(hapen)]Y·solvent (Him=imidazole, hapen=N,N′-bis(2-hydroxyacetophenylidene)ethylenediamine, Y=BPh4−, CF3SO3−, PF6−, ClO4−, and BF4−)

Abrupt Spin Transition with Thermal Hysteresis of Iron(III) Complex [Fe^III(Him)₂(hapen)]AsF₆ (Him = Imidazole, H₂hapen = N,N′-Bis(2-hydroxyacetophenylidene)ethylenediamine)

Syntheses, hydrogen-bonded assembly structures, and spin crossover properties of [FeIII(Him)2(n-MeOhapen)]PF6 (Him=imidazole and n-MeOhapen=N,N′-bis(n-methoxy-2-oxyacetophenylidene)ethylenediamine); n=4, 5, 6)

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Masataka Koike

Syntheses, three types of hydrogen-bonded assembly structures, and magnetic properties of [FeIII(Him)2(hapen)]Y·solvent (Him=imidazole, hapen=N,N′-bis(2-hydroxyacetophenylidene)ethylenediamine, Y=BPh4−, CF3SO3−, PF6−, ClO4−, and BF4−)

Abrupt Spin Transition with Thermal Hysteresis of Iron(III) Complex [FeIII(Him)2(hapen)]AsF6 (Him = Imidazole, H2hapen = N,N′-Bis(2-hydroxyacetophenylidene)ethylenediamine)

Syntheses, hydrogen-bonded assembly structures, and spin crossover properties of [FeIII(Him)2(n-MeOhapen)]PF6 (Him=imidazole and n-MeOhapen=N,N′-bis(n-methoxy-2-oxyacetophenylidene)ethylenediamine); n=4, 5, 6)

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Abrupt Spin Transition with Thermal Hysteresis of Iron(III) Complex [Fe^III(Him)₂(hapen)]AsF₆ (Him = Imidazole, H₂hapen = N,N′-Bis(2-hydroxyacetophenylidene)ethylenediamine)