Structure and stability of carboxylate complexes. Part II. Crystal and molecular structure of diaquobis(ethoxyacetato)copper(II)

Abstract

The crystal structure of diaquobis(ethoxyacetato)copper(II) has been determined by three-dimensional X-ray analysis (R= 0·110). The triclinic unit cell, space group P1, has dimensions, a= 6·60 ± 0·01, b= 7·21 ± 0·01, c= 7·58 ± 0·01 Å, α= 91·6 ± 0·3, β= 91·6 ± 0·3, γ= 117·3 ± 0·4°, with Z= 1. The complex contains trans chelate rings. The copper ions are in elongated tetragonally distorted environments with the two aquo-ligands perpendicular to the coplanar chelate rings. The observed bond lengths are Cu–OEt, 2·38, Cu–OH₂ 1·99, and Cu–OCO 1·97 Å. The long bonds are to the ethoxy-oxygen atoms. In this respect, the structure differs from the methoxyacetate analogue, where the relevant bond lengths are Cu–OMe 2·13, Cu–OH₂ 2·16, and Cu–OCO 1·93 Å.