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MOLECULAR PROBES: PHOTOISOMERIZATION OF OPTICALLY ACTIVE AZO COMPOUNDS
Author(s) -
Kölle U.,
Schätzle H.,
Rau H.
Publication year - 1980
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1980.tb03767.x
Subject(s) - photoisomerization , chemistry , photochemistry , circular dichroism , spectral line , polarity (international relations) , absorption spectroscopy , optically active , stereochemistry , optics , organic chemistry , isomerization , catalysis , physics , biochemistry , astronomy , cell
— The azo group may be used as a probe to gain information about the molecular surroundings. The circular dichroism (CD) spectra of two azo steroids have been investigated in media of different viscosity and polarity. The CD spectra of the trans ‐compounds are only slightly affected by the environment while those of the cis ‐compounds are strongly dependent on the environment. Photoisomerization is analysed by absorption and ellipticity diagrams as tests for chromophoric and conformeric uniformity. Our results support an inversion mechanism of the photoisomerization of azo compounds.