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- W2783446294 abstract "The article summarizes the results of our research on branched network of Provitamin D photo-isomerization in various media using UV absorption spectroscopy. The focus is on the microenvironment effect on the efficiency of Previtamin D cis-trans photoisomerization. Solvent polarity has a negligible effect in homogeneous solutions. In some inhomogeneous media a significant suppression of this undesirable side photoreaction of Previtamin D was detected. The result is discussed in accordance with the well known concept of ground state conformation control in trienes photochemistry. Unexpected increase of trans-isomer formation under UV irradiation is observed in liquid crystalline matrices as compared to the photoreaction in solvents. It indicates a change in the photoreaction pathway or mechanism of Previtamin D cis-trans isomerization. The results of further detailed temperature and concentration studies suggest that the ordering of a liquid-crystalline medium contributes to the increased efficiency of cis-trans isomerization due to the collective nature of process." @default.
- W2783446294 created "2018-01-26" @default.
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- W2783446294 date "2018-10-01" @default.
- W2783446294 modified "2023-10-17" @default.
- W2783446294 title "Medium controlled photochemistry of Provitamin D: From solutions to liquid crystals" @default.
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- W2783446294 doi "https://doi.org/10.1016/j.molliq.2018.01.049" @default.
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