Structures and spin states of bis(tridentate)-type mononuclear and triple helicate dinuclear iron(II) complexes of imidazole-4-carbaldehyde azine.
作者： Yukinari Sunatsuki , Ryohei Kawamoto , Kunihiro Fujita , Hisashi Maruyama , Takayoshi Suzuki
DOI: 10.1021/IC900977M
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摘要: Mononuclear [Fe(H2LR)2]2+ and dinuclear [Fe2(H2LR)3]4+ (R = H, 2-Me, 5-Me) complexes containing the new imidazole-4-carbaldehyde azine ligand (H2LH) its derivatives (H2L2-Me H2L5-Me) prepared from condensation reaction of 4-formylimidazole or 2-methyl- 5-methyl-4-formylimidazole with hydrazine (2:1) were prepared, their magnetostructural relationships studied. In mononuclear complexes, H2LR acts as an unsymmetrical tridentate two imidazole nitrogen atoms one atom, while in a dinucleating employing four to form triple helicate. At room temperature, [Fe2(H2LH)3](ClO4)4 [Fe2(H2L2-Me)3](ClO4)4 high-spin (HS) low-spin (LS) states, respectively. The results are accordance field strength H2L2-Me electron-donating methyl groups being stronger than H2LH, order strengths > H2LH. However, [...
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