EXCHANGE INTERACTION IN MULTINUCLEAR TRANSITION-METAL COMPLEXES. 3. SYNTHESIS, X-RAY STRUCTURE, AND MAGNETIC PROPERTIES OF CU2L(CH3COO)2.2CH3OH (L2- = ANION OF N,N′-BIS((2-(O-HYDROXYBENZHYDRYLIDENE)AMINO)ETHYL)-1,2-ETHANEDIAMINE), A O