SYNTHESIS AND MAGNETIC-RESONANCE OF NEW HETEROPOLYNUCLEAR LN(III)-CU(II) COMPLEXES WITH NONCYCLIC POLYETHER SCHIFF-BASE

A series of novel heteropolynuclear complexes of Ln(III)-Cu(II) and Cu (II) complex with noncyclic polyether Schiff base, salicylidene diethy lene glycol diamine (SALDA), have been synthesized for the first time. The isolated complexes are formulated as [LnCu(2)(SALDA)(3)(NO3)(5)]( NO3)(2). 4H(2)O (Ln= La, Pr, Nd, Sm, Gd, Tb, Er, To, Y) and [Cu(SALDA) (NO3)] (NO3). H2O. Synthesis methods are reported herein. The differen ces in their compositions, structures and coordination have been inves tigated by UV, IR, magnetic susceptibility, especially by H-1 and C-13 NMR spectra. II has been found that nu( C=N) in the Ln(III)-Cu(II) co mplexes are split up into two peaks with a far distance and it may be used as a probe for distinguishing them from others. In addition, it i s suggested that the ethereal oxygen donors are not all coordinated. T he good catalysis effect for the polymerization of methyl methacrylate (MMA) are reported for the first time. The results show that the cata lytic activity of Nd-Cu-SALDA complex is better than that of the other s and its syndiotactic sequence is -72% as well, the conversion increa ses to 88%.