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Photosublimation of the Novel π-System Photoproduct of Ethyl-4-formyl-1,3-dimethylpyrazole-5-carboxylate

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journal contribution
posted on 11.12.2003, 00:00 by Prakriti Ranjan Bangal, Naoto Tamai, Yasushi Yokoyama, Hideyuki Tukada
Photosublimation of the photoproduct of ethyl-4-formyl-1,3-dimethylpyrazole-5-carboxylate(EFDPC) has been observed for the first time at room temperature and normal atmospheric pressure. Steady state absorption spectroscopy and atomic force microscopic studies of EFDPC cast film as a function of UV/visible photoirradiation time revealed that upon photoirradiation EFDPC is converted to photoproduct first, which on further photoirradiation is evaporated from the substrate. This evaporation is a single photon phenomenon which is completely different from the laser ablation (sublimation) process.