Dicyanamide complexes of copper(II), nickel(II) and cobalt(II) with benzimidazole and its 2-alkyl-derivatives |
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Authors: | Mária Hvastijová Jiri Kohout Marián Okruhlica Jerzy Mroziński Lothar Jäger |
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Affiliation: | (1) Department of Inorganic Chemistry, Slovak Technical University, 81237 Bratislava, Czechoslovakia;(2) Institute of Chemistry, Wrocaw University, 50 383 Wrocaw, Poland;(3) Fachbereich Chemie, Martin-Luther-University Halle-Wittenberg, 0-4050 Halle/Saale, Germany |
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Abstract: | Summary Dicyanamide complexes of CuII, NiII and CoII of the type M[N(CN)2]2L2, where L = benzimidazole, 2-methyl- or 2-ethylbenzimidazole, have been prepared and studied by spectroscopy and magnetochemistry. The complexes, except for Co[N(CN)2]2 (benzimidazole)2, are six-coordinate, involving bidentate bridging dicyanamide groups. While the NiII complexes have practically octahedral structures, the CuII complexes are pseudooctahedral with similar tetragonal distortion. The ligand field strength in these complexes depends mainly on the steric effect of the benzimidazole ligands. The CoII complex of benzimidazole is monomeric tetrahedral, but that of 2-ethylbenzimidazole is tetragonal octahedral. The oridging function of dicyanamide in the six-coordinate complexes is realized either through both cyanide or through amide and cyanide nitrogens. The complex Cu[N(CN)2]2 (2-methylbenzimidazole)2 is a weak antiferromagnet (J = -0.1 cm–1), exhibiting under ca. 15 K a long-range antiferromagnetic ordering. |
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