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Abstract
A new ionic polyacetylene with coumarin moieties was synthesized via the non-catalyst polymerization of 2-ethynylpyridine using 4-bromomethyl-7-methoxycoumarin in high yield. The polymerization proceeded well in homogeneous manner to give 75% of yield without any additional catalyst or initiator. The polymer structure was identified by such various instrumental methods as NMR, IR, and UV-visible spectroscopies to have a conjugated backbone with the designed coumarin groups. The photoluminescence peak was observed at 512 nm corresponding to a photon energy of 2.42 eV. The cyclovoltamograms of polymer exhibited the electrochemically stable window at the −1.8 ∼ 1.50 V region. Oxidation and reduction were started at 0.58 and −0.8 V and had stable electrochemical property up to 30 cycles.
Acknowledgments
This work was supported by the National Research Foundation of Korea (NRF) grant funded from the Ministry of Education, Science and Technology (MEST) of Korea (No. 2011-0028320, No. 2012-001846). The authors thank Mrs S. E. Chae of Korea Basic Science Institute-Taegu Branch for the measurement of 500-MHz FT-NMR spectra of polymers.