CRYSTAL-STRUCTURE OF THE COPPER-MAGNESIUM COMPLEX WITH THE BINUCLEATING SCHIFF-BASE OF ETHYLENEDIAMINE WITH 3-FORMYLSALICYLIC ACID

The X-ray structure determination of [CuMg(fsaen)] 3H2O is reported. The ligand fsaen4-, in this complex, is the anion of the Schiff base of ethylenediamine with 3-formylsalycylic acid. This binucleating ligand provides a planar N2O2 donor grouping for the copper(II) ion and a planar O4 donor grouping for the magnesium(II) ion. Two axial water molecules complete octahedral coordination to the magnesium ion. The ligand has a slightly stepped conformation. The electronic spectrum of the copper(II) ion is compared to the spectra of copper(II) ions in other complexes of fsaen4-, and the relationships between such spectra and the structures of the complexes are discussed. © 1979.