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Spin Crossover in Bipyridine Derivative Bridged One-Dimensional Iron(III) Coordination Polymer

1
Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan
2
Chemistry Course, Department of Science, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
3
RI center, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan
*
Author to whom correspondence should be addressed.
Magnetochemistry 2020, 6(3), 29; https://doi.org/10.3390/magnetochemistry6030029
Received: 8 June 2020 / Revised: 24 June 2020 / Accepted: 28 June 2020 / Published: 1 July 2020
(This article belongs to the Special Issue Stimuli-Responsive Magnetic Molecular Materials)
Herein, the syntheses, solid-state molecular structures, and characterization of two types of one-dimensional FeIII coordination polymers showing thermally induced spin crossover are reported. The reaction of [Fe(acen)Cl] (acen2− = N,N′-ethylenebis(acetylacetonylideneaminate) with 3,3′-bpy or 4,4′-bpy (bpy = bipyridine) produced zigzag and linear one-dimensional chain complexes, [Fe(acen)(3,3′-bpy)][BPh4] (1) or [NEt3H][Fe(acen)(4,4′-bpy)][BPh4]2·0.5(4,4′-bpy) (2), respectively, as confirmed by single crystal X-ray diffraction analysis. Variable-temperature single crystal X-ray diffraction measurements, continuous-wave X-band electron paramagnetic resonance (EPR) spectra, 57Fe Mössßauer spectra, and DC magnetic susceptibility data revealed that complex 1 exhibited a gradual and complete spin crossover at a transition temperature of 212 K, while complex 2 undergoes an incomplete spin crossover even at 400 K. View Full-Text
Keywords: iron(III); Schiff base ligand; bipyridine ligand; crystal structure; spin crossover; EPR spectroscopy; Mössßauer spectroscopy iron(III); Schiff base ligand; bipyridine ligand; crystal structure; spin crossover; EPR spectroscopy; Mössßauer spectroscopy
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Ishikawa, R.; Noda, T.; Ueno, S.; Okubo, T.; Yamakawa, H.; Sakamoto, K.-I.; Kawata, S. Spin Crossover in Bipyridine Derivative Bridged One-Dimensional Iron(III) Coordination Polymer. Magnetochemistry 2020, 6, 29.

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