Abstract
The thermal polymerization of bis(trihalophenolato)(ethylenediamine)(pyridine)Nickel(II) complexes in toluene, which were kept at different temperature (20–110°C) with different time intervals and different amounts of I2, have been studied. The characterization of the complexes were studied by using FTIR, UV-visible, DSC and elemental analysis. The effects of time, temperature, and the amount of iodine were investigated on the percent conversion, the structure, and molecular weights of the synthesized polymers. The characterization of the polymers were performed by FTIR, 1H NMR and 13C NMR spectroscopies, DSC, and viscometric measurements. All polymers are highly rigid. The optimum condition to obtain highest percent yield from the decomposition of these complexes in solution was: 50°C, 3 h polymerization time and 75% I2 for bis(2,4,6-trichlorophenolato)(ethylenediamine)(pyridine)nickel(II) complex, 110°C, 3 h polymerization time and 30% I2 for bis(2,4,6-tribromophenolato)(ethylenediamine)(pyridine)nickel(II) complex. 2,4,6-Trichlorophenolate, with the chelating and non-chelating ligands, displays selectively in favor of 1,2-catenation, whereas 1,2- and 1,4-catenation takes place at equal rates in the case of 2,4,6-tribromophenolate.
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