Design of highly soluble extended pi-electron oligomers capable ofsupporting stabilized delocalized bipolaronic states for NLO applications,

摘要

Abstract: Several electroactive polymers, such as polyacetylene, polythlophene, poly (p-phenylene vinylene), and poly (2, 5- thienylene vinylene) have shown promise as NLO-active materials over the past few years. Extended conjugation pi-electron polymers, however, suffer from solubility and processability problems. Several recent experimental and theoretical studies have indicated that long conjugation sequences may not be necessary for enhanced $chi$+(3)$/ activity. During the past year we have utilized a suggestion of Wudl and coworkers and discovered that long, branched-chain alkyloxy groups can greatly enhance the solubility of various oligomers related to the above polymers. In this paper we present studies directed toward the incorporation of oligomeric subunits in formal copolymers and how stable bipolaronic charge states can be formed in NLO-active repeat units. !10