Synthesis of Conjugated Polymers with Alternating Aromatic and Quinonoid Sequences Via Elimination on Precursors.
HONEYWELL INC BLOOMINGTON MN PHYSICAL SCIENCES CENTER
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An elimination reaction for the formation of conjugated polymers from polymer precursors containing alternating sp superscript 3 carbon atom and conjugatged segments in the main chain is described. The resulting conjugated polymers with alternating aromatic and quinonoid sequences are inaccessible by conventional polymerization processes. The Pi-electron conjugation extension process is exemplified by reactions performed on poly5,5,alpha-bithiophenediyl p acetoxybenzylidene at 23 C and followed by electronic and infrared spectra. The semiconductor band gap narrowed from an initial value of 1.53 ev for the precursor polymer to about 0.83 ev for the conjugated derivative. Further evidence for the sp superscript 3 to sp superscript 2 carbon atom conversion by the elimination process is provided by infrared data.
- Polymer Chemistry