Abstract
Mixed copper(II) complexes, Cu(bzyoxb)(diam)X (wherebzyoxb=benzyl-(2-oxobutanoat)diam=N,N,N′,N′-tetramethylethylenediamine (tmen) andN-methyl-1,4-diazacycloheptane (medach), andX=ClO 4 − , Cl− and CH3CO 2 − (OAc−)), have been prepared. Their structures and properties were characterized by elemental analysis, UV-Vis, IR and Far IR spectroscopy and magnetic measurements. The square planar complexes were only obtained in presence of perchlorate anion, whereas the five coordinated complexes were obtained for both Cl− and OAc− counter-anions. The d-d absorption bands of perchlorate complexes were found to be linearly correlated with the donor number of solvents or coordinating anions. The results are discussed in terms of the extended donor-acceptor concept.
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