A Polyacetylene via the Cyclopolymerization of 4,10-Bis(diethylmalonate)-1,6,11-dodecatriyne: Synthesis and Characterization

Abstract

A new class of polyacetylene was synthesized via the cyclopolymerization of 4,10-bis(diethyl malonate)-1,6,11-dodecatriyne by using MoCl₅-EtAlCl₂ catalyst system. The polymerization proceeded in mild homogeneous manner to give 32% yield of polymer. The chemical structure of resulting polymer was characterized by NMR (¹H-, ¹³C-), IR, and UV-visible spectroscopies to have a conjugated backbone system. The polymer showed characteristic wide UV-visible absorption band and PL maximum peak at 530 nm corresponding to the photon energy of 2.34 eV. The cyclic voltammogram of polymer showed the stable electrochemical window in the range of of −1.50V to +1.50V. From the CV measurements, the HOMO energy level of the polymer was calculated to be 5.55 eV.

Keywords:

• polyacetylene
• cyclopolymerization
• non-conjugated triyne
• photoluminescence
• cyclic voltammetry