Cinnamates. Photosensitive polymers with pendant o-, m- and p-hydroxycinnamate moieties. Synthesis and spectroscopic characteristics (English version)
In this paper, we outline the photochemical and spectroscopic properties of a new class of light-sensitive polymers obtained as a result of poly(styrene-co-2-bromoethylmethacrylate) and chloromethylated polystyrene modification by attachment of apendant hydroxycinnamate group. These specific cinnamates after addition of tertiary amine display characteristic dual fluorescence. Dual emission is attributed to the presence of two different forms of phenolic group. The analysis of kinetic data of ionized form formation indicates substantial difference between polymeric and monomeric systems. Simultaneously, the addition of tertiary amine causes quenching of the singlet excited state. As aresult, the sharp decrease of sensitivity is observed. It is also shown that hydroxycinnamates are sensitive in both neutral and ionized forms of light-sensitive group.
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