POLYMER COMPLEXES .23. SYNTHESIS AND PHYSICOCHEMICAL STUDIES ON TRANSITION-METAL COMPLEXES OF SYMMETRICAL NOVEL POLY(N,N'-O-PHENYLENEDIAMINE)-BIS(CINNAMALDEHYDE)

New complexes derived from polymeric N.N'-o-phenylenediamine bis(cinnamaldehyde) (L) with Cu(II), Co(II), Ni(II), Zn(II), UO2II, and Pd(II) were prepared and characterized by elemental analysis, magnetic susceptibilities and spectroscopic (IR, far-IR, H-1-NMR, C-13-NMR and EPR) studies. A bidentate methine nitrogen atoms coordination of the ligand is assigned in the isolated complexes. The stereochemistries of the polymer complexes have been studied with using magnetic and spectroscopic measurements. Analytical data show 2:1 or 1:1 (ligand:metal) stoichiometry with water molecules coordinated to the Zn(II) ion, as evidenced from IR and thermal analysis (DTA). The ligand was tested as a corrosion inhibitor for copper; the limiting concentration of the ligand to give maximum efficiency (60\%) is 10(-3) mol dm-3 at 25-degrees-C.