Energy Transfer in the Solid State Photopolymerization of Diacetylenes
The photoreactivity of solid crystalline compounds containing two or more conjugated triple bonds per molecule was observed as early as 1882 by A. V. Bayer who synthesized N,NLdiacetyl-O,Ó diaminodiphenyldiacetylene as an intermediate in one of his famous attempts to synthesize indigo (1). Several years later, Straus (2) gave the first systematic report on photoreactive diacetylenes but he was unable to elucidate the structure of the polymer. Among others, Seher (3) and Bohlmann (4) in Germany and Jones, Armitage and Whiting in England (5) came across this peculiar photoreactivity which is shown by the monomer crystals only. In solution or melt, diacetylenes are quite stable toward uv- or high energy radiation. In the solid state, however, the same compounds are extremely light-sensitive and their colour deepens upon irradiation or annealing below their melting point from bright red for diacetylenes, via pink for triacetylenes, blue for tetraacetylenes, green for penta-acetylenes and to black for hexaacetylenes (4).
KeywordsTriple Bond Polymerization Mecha Packing Property Chain Direction High Energy Radiation
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