Specific features of photoisomerization of provitamin D
3 in a nematic liquid crystal |
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Authors: | T N Orlova I P Terenetskaya |
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Institution: | (1) Institute of Physics, National Academy of Sciences of Ukraine, Kiev, 03028, Ukraine |
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Abstract: | Photoisomerization of provitamin D 3 (7-dehydrocholesterol) in a nematic liquid crystal (ZLI-1695, Merck) is investigated in detail by UV absorption spectroscopy. It is found that dissolution of chiral molecules of provitamin D 3 induces the cholesteric phase in a nematic. The spectral kinetics of photoisomerization in this phase changes significantly from that in an ethanol solution. A sharp nonmonotonic dependence of the increase in accumulation of trans isomer tachysterol in a liquid crystal matrix with a decrease in the induced cholesteric pitch from 2200 to 25 μm is revealed. |
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