TY - JOUR
T1 - Reversible photochemistry and photocyclization of 10H,10′H-bianthrylidene
AU - Korenstein, Rafi
AU - Muszkat, Karol A.
AU - Fischer, Ernst
PY - 1977
Y1 - 1977
N2 - The photochemistry of 10,H,10′H-bianthrylidene was extensively studied over a wide temperature range. Two photoisomers, C and E, are formed, both reverting thermally to the parent modification A. The C isomer is a cyclization product of the 4a.4b-dihydrophenanthrene type, whereas the E isomer results from cis-trans-isomerization about the central double bond together with additional torsions about the four single bonds of the 9,9′- ethylene system. The A, E, and C modifications are oxidized by atomic iodine. The dependence of the quantum yield of fluorescence on temperature indicates that intersystem crossing is an activated process above a certain critical temperature (ca. -130°) and non-activated at lower temperatures. The C modification is formed from the excited singlet and the E isomer from the triplet state.
AB - The photochemistry of 10,H,10′H-bianthrylidene was extensively studied over a wide temperature range. Two photoisomers, C and E, are formed, both reverting thermally to the parent modification A. The C isomer is a cyclization product of the 4a.4b-dihydrophenanthrene type, whereas the E isomer results from cis-trans-isomerization about the central double bond together with additional torsions about the four single bonds of the 9,9′- ethylene system. The A, E, and C modifications are oxidized by atomic iodine. The dependence of the quantum yield of fluorescence on temperature indicates that intersystem crossing is an activated process above a certain critical temperature (ca. -130°) and non-activated at lower temperatures. The C modification is formed from the excited singlet and the E isomer from the triplet state.
UR - http://www.scopus.com/inward/record.url?scp=37049096358&partnerID=8YFLogxK
U2 - 10.1039/P29770000564
DO - 10.1039/P29770000564
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AN - SCOPUS:37049096358
SN - 1470-1820
SP - 564
EP - 569
JO - Journal of the Chemical Society, Perkin Transactions 2
JF - Journal of the Chemical Society, Perkin Transactions 2
IS - 5
ER -