Triaminoguanidine derivatives as supports to construct magnetic assemblies: Synthesis and characterization of trinuclear nickel(II) complexes

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• 作者：Adrian E. Ion ; Eike T. Spielberg ; Helmar Gö ; rls ; Winfried Plass
• 关键词：Triaminoguanidine ; Magnetochemistry ; Self-assembly ; Crystal structure ; Nickel complexes
• 刊名：Inorganica Chimica Acta
• 出版年：2007
• 期刊代码：40_00201693
• 类别：ch
• 出版时间：1 October 2007
• 卷：360
• 期：13
• 页码：3925-3931
• 文件大小：655 K

摘要

The synthesis of two nickel(II) complexes based on a central bridging triaminoguanidine scaffold and a capping ligand per metal ion is reported. When 2,2′-bipyridine (bipy) is utilized as co-ligand the complex [Ni₃L^Br(bipy)₃(H₂O)₃]NO₃ · 9H₂O · 1.5DMF (1) is obtained which crystallizes in the hexagonal space group P6₃/m. Complex 1 shows an interesting supramolecular structure pattern with alternating hydrophilic and hydrophobic layers characterized by extensive hydrogen-bonding and π–π-stacking, respectively. With 2,4,6-(2-pyridyl)-1,3,5-triazine (tptz) as capping ligand, complex [Ni₃L^Br(tptz)₃]ClO₄ · 7H₂O · 1.5DMF (2) is obtained. The magnetic susceptibility data can be fitted using an equilateral triangle model () with an isotropic coupling constant of J=-31.0±0.6 for 1 and for 2.