Cobalt(II) coordination compounds with acetate and 2-aminopyridine ligands: Synthesis, characterization, structures and magnetic properties of two polymorphic forms

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• 作者：Brina Dojer ; Andrej Pevec ; Primož ; Š ; egedin ; Zvonko Jaglič ; ić ; Č ; rtomir Stropnik ; Matjaž ; Kristl ; Miha Drofenik
• 关键词：Cobalt acetate tetrahydrate ; 2-Aminopyridine ; X-ray crystal structure ; Magnetic measurements
• 刊名：Inorganica Chimica Acta
• 出版年：2010
• 出版时间：20 April 2010
• 年：2010
• 卷：363
• 期：7
• 页码：1343-1347
• 全文大小：446 K

文摘

The synthesis and characterization of two polymorphic modifications of new cobalt coordination compound with 2-aminopyridine are reported. The modifications were prepared by the reaction of a solution of cobalt acetate tetrahydrate and 2-aminopyridine. The crystal structures of both polymorphic modifications have been determined by single-crystal X-ray diffraction analysis. The structures of both modifications are quite similar. In both of them the Co²⁺ is six coordinated by four O atoms from two bidentate chelate acetate ligands and by two N atoms from two 2-aminopyridine molecules. Acetate and 2-aminopyridine ligands are lying cis about the metal centre. The most important difference is in asymmetry of acetate ligand chelate bonding and in H-bonding network. Compounds exhibit an extensive system of intra and intermolecular hydrogen bonding. Magnetic properties of both modifications were studied between 2 K and 300 K giving the result μ_eff = 4.6 BM for modification I and μ_eff = 4.7 BM for modification II in paramagnetic region.