Polymer complexes XLI. Supramolecular assemblies comprised of novel structural models of mixed metal polymer complexes

Abstract

Mono, bis- and tris-polymer complexes of ruthenium(III) and rhodium(III) chloride with 3-hydroxy-2-N-acrylamidopyridine (H2L) monomer, derived from amidation of acryloyl chloride with 2-amino-3-hydroxypyridine, have been prepared. A few bimetallic mixed ligand polymer complexes have also been obtained by the reaction of rhodium(II) bidentate poly-chelate mixed ligand with palladium(II), platinum(II) or zirconium(IV) chlorides and uranyl acetate. These polymer complexes have been characterized on the basis of their elemental analysis, magnetic susceptibility, electronic and infrared spectral data and thermal analysis. The homopolymer shows three types of coordination behavior. The poly-chelates are of 1 : 1, 1 : 2 and 1 : 3 (metal : homopolymer) stoichiometry and exhibit six coordination. Electronic spectra show all complexes are octahedral. The spectral data were utilized to complete the important ligand field parameters B, β and Dq. The B-values suggest a strong covalency in the metal-ligand σ-bond and the Dq-values indicate a medium-strong ligand field. The stereochemistry and the nature of the polymer complexes are markedly dependent upon the molar ratios of the reactants, the pH of the system and the nature of the anions involved.