Abstract
The photoinduced generation and decay kinetics of paramagnetic intermediate radical states in the UV-photopolymerization of TSHD single crystals [bis (p-toluene sulphonate) ester of 2,4-hexadiyne-1,6 diol] has been analyzed by ESR-spectroscopy. By optical bleaching a correlation between the paramagnetic carbene type and the diradical type triplet states is obtained. The precursors of the photopolymerization reaction are identified by a quadratic UV-intensity dependence of the generation process which is characteristic of a bimolecular reaction.
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