Kwon-Taek Lim

Synthesis and Characterization of Water-Soluble Ionic Conjugated Polyacetylene

A water-soluble ionic conjugated polymer with pyridyl functional groups, poly(2-ethynyl-N-pentylpyridinium iodide)[PEPPI] was synthesized via the activated polymerization of 2-ethynylpyridine using 1-iodopentane without any additional initiator or catalyst. The polymerization proceeded well to provide a high yield of polymer. The polymer structure was characterized by such instrumental methods as NMR (1H- and 13C-), IR, and UV-visible spectroscopies to have a conjugated polymer backbone system having N-pentylpyridinium iodide as substituents. The photoluminescence maximum peak of PEPPI was located at 583 nm, which corresponds to the photon energy of 2.13 eV. The cyclovoltamograms of polymer exhibited the electrochemically stable window at the −1.54∼1.54 V region. It was found that the kinetics of the redox process of PEPPI are mainly controlled by the reactant diffusion process based on the experiment of the oxidation current density of polymer versus the scan rate.

Synthesis and Properties of an Ionic Polyacetylene with 3rd Generation Dendritic Moieties

A new ionic conjugated polyacetylene with 3rd generation dendritic benzyl moieties was easily prepared by the activated polymerization of 2-ethynylpyridine by using 3rd generation dendritic benzyl bromide. The chemical structure of polymer was characterized by various instrumental methods to have the ionic conjugated polymer system bearing 3rd generation dendritic benzyl moieties. The photoluminescence spectra of polymer showed that the photoluminescence peak is located at 516 nm, corresponding to a photon energy of 2.41 eV. The cyclovoltamograms of this polymer exhibited reversible electrochemical behaviors between the doping and undoping peaks. The kinetics of the redox process of this polymer was found that it is almost controlled by the diffusion process from the experiment of the oxidation current density of polymer versus the scan rate.