<b>Synthesis, characterization, thermal degradation and electrical conductivity of poly-4-[(pyridin-2-yl-imino)methyl]benzene-1,3-diol and polymer-metal complexes</b>

Abstract

Poly-4-[(pyridin-2-yl-imino)methyl]benzene-1,3-diol (P-4-PIMBD) was synthesized via t he oxidative polycondensation reaction by using sodium hypo chloride (NaOCl) oxidant in an aqueous alkaline medium at 70 o C. The yield of the polymer was found to be 68 %. The structures of the compounds were confirmed by FT-IR, UV-Vis, 1 H-NMR and 13 C-NMR and elemental analysis. The synthesized compounds were characterized by TGA-DTA and solubility tests. 1 H and 13 C NMR data shows that the polymerization proceeded by the C-C coupling of ortho and para positions according to –OH groups of 4-[(pyridin-2-yl-imino)methyl]benzene-1,3-diol (4-PIMBD) . According to size exclusion chromatography (SEC) measurements, t he number-average molecular weight (M n ), weight-average molecular weight (M w ) and polydispersity index (PDI) values of P-4-PIMBD were found as 9400, 12800 g mol -1 and 1.362, respectively. The polymer-metal complex compounds were synthesized with acetates salts of Cd, Co, Cu, Zn and Ni. Thermal analyses of these metal-complex compounds investigated in N 2 atmosphere between 15-1000 °C. Also, FT-IR spectra and electrical conductivities of polymer-metal complexes were measured by four-point technique. KEY WORDS: Poly-4-[(pyridin-2-yl-imino)methyl]benzene-1,3-diol, Thermal analysis, Oxidative polycondensation, Electrical conductivity Bull. Chem. Soc. Ethiop. 2008 , 22(2), 237-246.