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Crystal and molecular structures of the complexes of cobalt dichloride with 1-isopropenylimidazole and 1-vinylimidazole
Authors:L. V. Baikalova  V. I. Sokol  I. A. Zyryanova  I. V. Fedyanin  V. N. Khrustalev  E. A. Zel’bst  O. A. Tarasova  V. S. Sergienko  B. A. Trofimov
Affiliation:(1) Favorskii Irkutsk Institute of Chemistry, Siberian Division, Russian Academy of Sciences, ul Favorskogo 1, Irkutsk, 664033, Russia
Abstract:
The crystal and molecular structures of bis(1-isopropenylimidazole)dichlorocobalt (C12H16Cl2·N4Co) [R 0.036 (R W 0.089) for 3229 unique reflections with I > 2σ(I)] and tetra(1-vinylimidazole)dichlorocobalt (C20H24Cl2N8Co) [R 0.031 (R W 0.072) for 1863 unique reflections with I > 2σ(I)] were determined. In these molecular complexes, the monodentate terminal 1-alkenylimidazole ligands coordinate to the metal via a “pyridine” nitrogen atom. In C12H16Cl2N4Co, the Co atom has a distorted tetrahedral 2N,2Cl coordination. The coordination polyhedron of cobalt in C20H24Cl2N8Co is a strongly elongated 4N,2Cl octahedron. The Co-N and Co-Cl bonds [Co-N 2.015(2) and 2.032(4) Å; Co-Cl 2.229(2) Å] in the tetrahedral complex C12H16Cl2N4Co are shorter than those in the octahedral complex C20H24Cl2N8Co [Co-N 2.134(2) and 2.157(2) Å; Co-Cl 2.518(1) Å]. In the structures of both complexes there are short contacts involving the Cl atoms.
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