Spectral and Magnetic Studies on Bi- and Tri-Nuclear Complexes Derived from Copper(II) Complexes with Tetradentate Schiff Base and One of the Chlorides, Nitrates and Perchlorates of Copper(II), Nickel(II), Cobalt(II) and Zinc(II)

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We have prepared a variety of binuclear and trinuclear complexes of the composition Cu-(TDSB)·MX2 and 2Cu(TDSB)·M(ClO4)2, where Cu(TDSB)=N,N′-ethylenebis(salicylideneiminato)copper(II) or N,N′-1,2-propylenebis(salicylideneiminato)copper(II), and M=Co, Ni, Cu and Zn. A few higher polynuclear species were also prepared. The previously reported empirical rule found in binuclear copper(II) complexes, where the two copper ions are in the same environment, that the "higher energies of d-d bands - lower magnetic moments," was proved to hold in the binuclear copper complexes of the present study, even though the two copper ions are in different environments. For a series of complexes with M = Cu or other metals, and with X = NO3 or ClO4, it was observed that "d-d bands of Cu(TDSB) apperas at the shortest wavelengths when M = Cu." For perchlorate complexes, the energy of the d-d band is in the order, Co<Ni<Cu>Zn, the same as the Irving and Williams' order of complex stability. It can then be generalized that in a hetero-polynuclear complex molecule, the strengthening of the coordinate bonds around one metal ion strengthens the coordinate bonds around the other metal ion or ions.
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