Synthesis, optical and electrochemical properties of poly(N-bromo-2-ethynylpyridinium bromide)

Abstract

ABSTRACTPoly(N-bromo-2-ethynylpyridinium bromide) was synthesized via the catalyst-free polymerization of 2-ethynylpyridine using bromine in high yield. The activated triple bonds of N-bromo-2-ethynylpyridinium bromide formed at the initial quaternization reaction are susceptible to linear polymerization, followed by an identical propagation step that contains the produced macroanion and quaternized N-bromo-2-ethynylpyridinium bromide species. The chemical structure of polymer was characterized by various instrumental methods to have the conjugated polymer backbone system bearing the designed N-bromo-2-pyridinium bromide substituents. The optical and electrochemical properties of polymer were studied. The UV-visible spectrum of polymer showed a characteristic absorption peak in the visible region (up to 800 nm). The photoluminescence emission spectrum of polymer shows two distinct peaks at 407 and 516 nm. The cyclic voltammetry of polymer exhibited irreversible electrochemical behavior between the oxidation and reduction peaks.