An ionic polyacetylene from the non-catalyst polymerization of 2-ethynylpyridine using 1,6-dibromohexane: Synthesis and characterization

ABSTRACT

An ionic polyacetylene was prepared via the non-catalyst polymerization of 2-ethynylpyridine using 1,6-dibromohexane. The polymerization proceeded in homogeneous manner to give a high yield of polymer (88%). The polymer structure was characterized by such instrumental methods as IR, NMR, and UV-visible spectroscopies to have the conjugated polymer backbone with the designed bromohexylpyridinium substituents. The absorption spectrum exhibits several absorption peaks such as 289, 330, 387, and 489 nm and band gap was 2.44 eV. The photoluminescence spectrum of polymer showed the maximum peak at 550 nm. Overall redox current shape and values were very stable in the range of −1.5 V to 1.5 V under up to 50 cylcles. Oxidation and reduction were started at 0.35 and −0.6 V.

KEYWORDS:

• polyacetylene
• 2-ethynylpyridine
• 1,6-dibromohexane
• non-catalyst polymerization
• cyclic voltammogram

Acknowledgment

This work was also 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).