SYNTHESIS AND PROPERTIES OF TRANSITION-METAL COMPLEXES WITH BRANCHED POLY(ETHYLENEIMINE)

Polychelates were obtained by addition of an aqueous solution of the b ranched poly(ethyleneimine) (BPEI) to the aqueous solutions of Cu(II), Co(II), and Ni(II). All the polychelates were characterized by elemen tal analysis, FT-IR, H-1 NMR spectroscopy, thermogravimetry, and scann ing electron microscopy. Conductivity and magnetic moment measurements were also carried out. The three polychelates showed a change of the chemical shift in H-1 NMR spectra due to the metal ion complexing with the polyligand. Accordingly to the spectral study, the polychelates s howed different geometric arrangements: Cu-BPEI square planar, Ni-BPEI tetrahedral, and Co-BPEI octahedral.