Abstract
The kinetics of provitamin D photoisomerization in solutions and silica gel-solvent matrix upon lamp irradiation on 254 nm was measured by UV spectroscopy. The reduction of the efficiency for cis-trans isomerization in dispersive systems was revealed as compared with the solutions and the effect was established to exhibit a very substantial solvent polarity dependence. The well known concept of ground-state conformational control was utilized to explain the influence of the adsorption on the photobehaviour of provitamin D. More importantly, the results obtained reveal that the dispersive systems can be used in the certain cases to control the conformations of organic molecules and photoproducts distribution.
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