TY - JOUR
T1 - Reversible photoisomerization and fluorescence of bithioxanthene
T2 - Temperature and spin-orbit perturbation effects
AU - Korenstein, R.
AU - Muszkat, K. A.
AU - Fischer, E.
PY - 1976
Y1 - 1976
N2 - A detailed experimental study of the reversible photochemistry of bithioxanthene over a wide temperature range indicates the photoformation of two unstable isomers: E, absorbing at shorter wavelength, and P, absorbing at longer wavelengths. Both isomers revert thermally to the parent compound, A. E is formed through the triplet manifold while P is formed directly from the excited singlet state. The quantum yield for the A → E process is temperature dependent and is enhanced by molecular oxygen and by xenon. A low temperature proton n.m.r. analysis of the E and A forms indicates a structure for E which involves cis-trans isomerization about the 9-9′ central double bond and additional torsion about the four single bonds attached to it.
AB - A detailed experimental study of the reversible photochemistry of bithioxanthene over a wide temperature range indicates the photoformation of two unstable isomers: E, absorbing at shorter wavelength, and P, absorbing at longer wavelengths. Both isomers revert thermally to the parent compound, A. E is formed through the triplet manifold while P is formed directly from the excited singlet state. The quantum yield for the A → E process is temperature dependent and is enhanced by molecular oxygen and by xenon. A low temperature proton n.m.r. analysis of the E and A forms indicates a structure for E which involves cis-trans isomerization about the 9-9′ central double bond and additional torsion about the four single bonds attached to it.
UR - http://www.scopus.com/inward/record.url?scp=0006211625&partnerID=8YFLogxK
U2 - 10.1016/0047-2670(76)85034-4
DO - 10.1016/0047-2670(76)85034-4
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AN - SCOPUS:0006211625
SN - 0047-2670
VL - 5
SP - 345
EP - 353
JO - Journal of Photochemistry
JF - Journal of Photochemistry
IS - 5
ER -