The Synthesis, Magnetic, and Spectroscopic Properties of Binuclear Iron(III) Complexes Bridged by Pyrazine, 1,1′-Tetramethylenebis(imidazol), or Bis(pyridine) Compounds Exhibiting a Spin-Equilibrium Behavior
The Synthesis, Magnetic, and Spectroscopic Properties of Binuclear Iron(III) Complexes Bridged by Pyrazine, 1,1′-Tetramethylenebis(imidazol), or Bis(pyridine) Compounds Exhibiting a Spin-Equilibrium Behavior
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表现出自旋平衡行为的吡嗪、1,1-四亚甲基双(咪唑)或双(吡啶)化合物桥接的双核铁(III)络合物的合成、磁性和光谱性质
DOI：
10.1246/bcsj.59.155
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发表时间：
1986
影响因子：
4
通讯作者：
A. Ohyoshi
中科院分区：
文献类型：
--
作者：
Sho Ohta;C. Yoshimura;N. Matsumoto;H. Ōkawa;A. Ohyoshi
制备了五种由吡嗪、1,1′-四亚甲基双(咪唑)或双(吡啶)化合物桥联的结构式为[LFe(Bge)FeL](BPh4)2的双核铁(III)配合物，并通过磁性材料的温度依赖性研究了它们在高自旋(S=5/2)和低自旋(S=1/2)态之间的自旋平衡行为。磁化率和电子光谱，其中Bge表示吡嗪、1,1'-四亚甲基双(咪唑)、4,4'-联吡啶、4,4'-亚乙基双(吡啶)或4,4'-亚乙烯基双(吡啶)，L=双(3-水杨基氨基丙基)胺，BPh4−=四苯基硼酸盐。吡嗪配合物是低自旋的，而双（咪唑）和双（吡啶）配合物在高自旋和低自旋状态之间实现了自旋平衡，并在固体和溶液中伴随着显着的热致变色现象。
Five binuclear iron(III) complexes bridged by pyrazine, 1,1′-tetramethylenebis(imidazol), or bis(pyridine) compounds with the formula of [LFe(Bge)FeL](BPh4)2 have been prepared, and their spin-equilibrium behavior between high-spin(S=5/2) and low-spin(S=1/2) states has been investigated by means of the temperature dependences of the magnetic susceptibilities and the electronic spectra, where Bge denotes pyrazine, 1,1′-tetramethylenebis(imidazol), 4,4′-bipyridine, 4,4′-ethylenebis(pyridine), or 4,4′-vinylenebis(pyridine), L=bis(3-salicylideneaminopropyl)amine, and BPh4−=tetraphenylborate. The pyrazine complex is low-spin, while the bis(imidazole) and the bis(pyridine) complexes snowed a spin-equilibrium between high-spin and low-spin states, accompanied by a striking thermochromism in both the solids and solutions.