Synthesis and Electro-Optical Properties of Poly(4-ethynylaniline)

Abstract

A new conjugated polymer with amine groups was synthesized in high yields by the polymerization of 4-ethynylaniline with various transition metal catalysts. The polymer structure was identified by various instrumental methods to have a conjugated polymer backbone system with p-aminophenyl substituents. The photoluminescence peak of poly(4-ethynylaniline) is located at 478 nm corresponding to the photon energy of 2.60 eV. From the CV measurements, the HOMO energy level of the polymer was calculated to be 5.03 eV.

Keywords:

• 4-ethynylaniline
• conjugated polymer
• HOMO
• photoluminescence
• polyacetylene

Acknowledgments

This work was supported by grant No. RTI04-01-04 from the Regional Technology Innovation Program of the Ministry of Commerce, Industry and Energy (MOCIE). The authors thank Mrs Y. S. Moon of Korea Basic Science Institute-Taegu Branch for the measurement of 500-MHz FT-NMR spectra of polymers.

Notes

^a Polymerization was carried out at 90°C for 24 hrs in DMF. Monomer to catalysts mole ratio (M/C) and initial monomer concentration ([M]₀) were 30 and 0.78 M, respectively.

^b Ethyl ether-insoluble polymer.

^c Inherent viscosities were determined at a concentration of 0.5 g/dL in DMF at 30°C.