REDETERMINATION OF CRYSTAL-STRUCTURE, EPR AND MAGNETIC DATA OF TRIS(1,2-ETHANEDIOL) COPPER(II) SULFATE

The crystal structure of the tris(1,2-ethanediol) complex of copper su lphate was redetermined to study the conformations of 1,2-ethanediol m olecule around the C-O axes. In all 1,2-ethanediol molecules one of th e OH hydrogen atoms is in nearly antiperiplanar (trans) position (173. 0, 182.3, 196.1-degrees) to the remote C atom. The second OH hydrogen atoms in the molecules are placed in synclinal (gauche, 66.1-degrees), nearly synclinal (84.9-degrees) and antiperiplanar (239.5-degrees) po sition to the remote C atoms. The tetragonally distorted octahedral co ordination sphere determined by crystallography was supported by EPR s pectra. A weak superexchange coupling was suggested on the basis of th e magnetic susceptibility measurements in the 4.2-290 K temperature ra nge.