Polymerization and characterization of various di(pyridine)bis(trihalophenolato)cobalt(II) complexes in solid and melt states

The syntheses of distorted tetrahedral bis(pyridine)bis(trihalophenolato)co balt(II) complexes from an aqueus solution were achieved and their characte rization by FT-IR, X-ray, DSC, UV-visible and elemental analysis in solid s tate or in melt form is reported. Polymerizations of these complexes were a ccomplished either at constant temperature, employing different time interv als or constant decomposition times while varying the temperature range. Th e slow decomposition at constant temperature leads to long chain products, whereas long chains formed at higher temperatures were during a constant ti me. The resulting poly(dihalophenylene oxide)s were characterized by FT-IR, H-1 NMR, C-13 NMR spectral analysis, differential scanning calorimetry and molecular weight determinations by viscometric method. (C) 2001 Society of Chemical Industry.