Spin crossover in a mononuclear compound [Fe(EPPA)(bpym)](ClO₄)₂ (EPPA = N-(2-aminoethyl)-N-(3-aminopropyl)-2-(aminomethyl)pyridine, bpym = 2,2′-bipyrimidine): Synthesis, structure, and magnetic properties

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• 作者：Mark B. Bushuev ; Erwann Jeanneau ; Dominique Luneau ; Galina S. Matouzenko
• 关键词：Iron(II) complexes ; N ligands ; Magnetic properties ; Spin crossover ; Crystal structures
• 刊名：Inorganica Chimica Acta
• 出版年：2007
• 期刊代码：40_00201693
• 类别：ch
• 出版时间：1 April 2007
• 卷：360
• 期：5
• 页码：1639-1644
• 文件大小：371 K

摘要

The synthesis, magnetic properties and single crystal study of a new spin crossover compound [Fe(EPPA)(bpym)](ClO₄)₂ with EPPA = N-(2-aminoethyl)-N-(3-aminopropyl)-2-(aminomethyl)pyridine, bpym = 2,2′-bipyrimidine are reported. Variable-temperature magnetic susceptibility data collected in the temperature range 10–294 K reveal the occurrence of a relatively cooperative spin transition with T_1/2 = 108 K. The crystal structure of [Fe(EPPA)(bpym)](ClO₄)₂ was determined by single-crystal X-ray diffraction method. The structure of the complex consists of mononuclear [Fe(EPPA)(bpym)](ClO₄)₂ units. The potentially bis-bidentate bpym ligand acting as a bidentate one, is coordinated to iron(II) in cis-position by two nitrogen atoms. The four remaining positions in the pseudooctahedral [FeN₆] core are occupied by one pyridinic and three aliphatic nitrogens of the EPPA ligand. The network of cooperative links in the crystal lattice is represented by H-bonding and π stacking interactions.