Polymer complexes. Part XXVII. Novel mixed-valence-ligand poly(2-acryl-amido-1-phenyl-2-aminothiourea) complexes

Abstract

Polymer complexes of homopolymer (APATH) with Rh (III) and Ru (III) have been prepared and characterized through chemical analyses, thermal, electronic and infrared spectral studies, and magnetic and conductance measurements. The homopolymer shows three types of coordination behaviour. In the mixed valence paramagnetic trinuclear polymer complexes (( 1) and ( 2) in the paper), and in the monocuclear polymer compound ( 3) it acts as a neutral bidentate ligand coordinating through the thiocarbonyl sulphur and carbonyl oxygen atoms, while in the mixed ligand paramagnetic poly-chelates, which are obtained from the reaction of APATH with RuCl 3. XH 2O in the presence of N-heterocyclic bases consisting of polymer complexes ( 7) and ( 9), and in mononuclear compounds ( 6) and ( 8), it behaves as a monobasic bidentate ligand coordinating through the same donor atoms. In mononuclear compounds ( 4) and ( 5) it acts as a monobasic and neutral bidentate ligand coordinating only through the same donor atoms. Monomeric distorted octahedral or trimeric chlorine-bridged, approximately octahedral structures are proposed for these polymer complexes. Various ligand field parameters have been calculated and discussed. The poly-chelates are of 1:1, 1:2 and 3:2 (metal: poly-Schiff base) stoichiometry and exhibit five and six coordination. Thermogravimetric studies indicate that these polymer complexes are stable up to ∼200°C and undergo complete decomposition in the range 200–570°C resulting in the formation of the stable metal oxides. The toxicity of the complexes and ligand have been demonstrated.