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Published on: March 19, 2020
Structures and electronic properties of cobalt(II) selone coordination complexes
Shaydel M Purcell1, Eric W Reinheimer2, Jamie S Ritch1
1Department of Chemistry, The University of Winnipeg, 515 Portage Ave, Winnipeg, MB R3B 2E9, Canada.
Abstract:
The structural chemistry of selenourea ligands is quite diverse, though examples of their coordination to cobalt are rare. In this study, the solid-state structures of the selenourea 1,3-diethylimidazole-2-selone, C7H12N2Se, and the cobalt complexes dichloridobis(1,3-diethylimidazole-2-selone-κSe)cobalt(II), [CoCl2(C7H12N2Se)2] (1), and dichloridobis(1,3-diisopropylimidazole-2-selone-κSe)cobalt(II), [CoCl2(C9H16N2Se)2] (2), are presented. Two crystallization methods for the coordination complexes are utilized. The structures of complexes 1 and 2 are compared with the few existing examples in the literature, revealing a similar trend for terminal binding modes, rather than bridging modes which are often seen for late d-block metal complexes. Density functional theory calculations reveal a trend in cobalt-selenium bond strengths for 1,3-dialkyl-substituted imidazole-2-selones of Me ≃ Et < iPr.
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