Crystal and molecular structure of dichlorotris-(1,2-dimethylimidazole)copper(II); a trigonal-bipyramidal complex showing elongation of the equatorial Cu–N bond
- 1 January 1971
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 1927-1931
- https://doi.org/10.1039/j19710001927
Abstract
The structure of dichlorotris-(1,2-dimethylimidazole)copper(II), CuCl2(C5H8N2)3, has been determined by three-dimensional X-ray structure analysis and refined by least-squares methods using 3018 independent reflections to R= 0·032. The crystals are orthorhombic, with unit-cell dimensions a= 15·205, b= 8·791, c= 29·81 Å, space group Pca21, and Z= 8. The complex is monomeric, and there are no chemically significant differences between the two crystallographically independent molecules in the cell. The copper atom has a trigonal-bipyramidal co-ordination, with the equatorial positions occupied by two chlorine atoms and a donor nitrogen atom. The equatorial Cu–N bonds (2·145 Å) are appreciably longer than the axial ones (2·005 Å). This is discussed in terms of the stereochemical influence of the half-filled dz2 orbital in this type of co-ordination. In all molecules the two Cu–Cl bonds are slightly different, with average lengths of 2·370 and 2·414 Å.Keywords
This publication has 0 references indexed in Scilit: