The colour isomerism and structure of some copper co-ordination compounds. Part XIII. Crystal structure of bis-(N-ethylsalicylaldiminato)copper(II)

Abstract

A three-dimensional X-ray structural analysis of bis-(N-ethylsalicylaldiminato)copper(II) has revealed a distorted molecular configuration similar to that observed for bis-(N-t-butylsalicylaldiminato)copper(II). The copper atom is quadricovalent, with the two chelate groups orientated to give a co-ordination geometry intermediate between square planar and tetrahedral. The Cu–O bonds are 1·875 and 1·906 Å in length, and the Cu–N bonds 1·918 and 1·966 Å. The angles at the copper atom are 91·2, 92·6, 93·1, 94·5, 152·5, and 155·9°, and the angle between the mean planes of the two salicylaldiminato-residues is 41·2°. One of these groups is more distorted than the other. Intermolecular distances are normal.