Structural characterization of two solvates of a luminescent copper(II) bis-(pyridine)-substituted benzimidazole complex.

ABSTRACT: Copper(II) complexes of benzimidazole are known to exhibit biological activity that makes them of inter-est for chemotherapeutic and other pharmaceutical uses. The complex bis-(acetato-?O){5,6-dimethyl-2-(pyridin-2-yl)-1-[(pyridin-2-yl)meth-yl]-1H-benzimidazole-?²N²,N³}copper(II), has been prepared. The absorption spectrum has features attributed to intra-ligand and ligand-field transitions and the complex exhibits ligand-centered room-temperature luminescence in solution. The aceto-nitrile monosolvate, [Cu(C₂H₃O₂)₂(C₂₀H₁₈N₄)]·C₂H₃N (1), and the ethanol hemisolvate, [Cu(C₂H₃O₂)₂(C₂₀H₁₈N₄)]·0.5C₂H₆O (2), have been structurally characterized. Compound 2 has two copper(II) complexes in the asymmetric unit. In both 1 and 2, distorted square-planar N₂O₂ coordination geometries are observed and the Cu-N(Im) bond distance is slightly shorter than the Cu-N(py) bond distance. Inter-molecular ?-? inter-actions are found in 1 and 2. A weak C-H?? inter-action is observed in 1.

SUBMITTER: Geiger DK 

PROVIDER: S-EPMC5683476 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature