TY - JOUR
T1 - The reversible photochemistry of dixanthylidenes
T2 - Temperature, external spin-orbit perturbation effects and structure of the C and F photoisomers
AU - Korenstein, R.
AU - Muszkat, K. A.
AU - Fischer, E.
PY - 1976
Y1 - 1976
N2 - An extensive photochemical study of dixanthylidenes shows the existence of three unstable isomers: B, F and C. The C isomer was shown by low temperature proton n.m.r. to be a photocyclization product at the 1 and 1′ positions. The structure of the F isomer was shown to involve both rotation of 180° about the central double bond and additional torsion about the four single bonds attached to it. The quantum yields for the A → B process are enhanced by external spin-orbit perturbers. The B isomer was shown to be formed from the triplet state. The formation of C, B and F are temperature controlled. Fluorescence quantum yields in these systems are strongly temperature dependent.
AB - An extensive photochemical study of dixanthylidenes shows the existence of three unstable isomers: B, F and C. The C isomer was shown by low temperature proton n.m.r. to be a photocyclization product at the 1 and 1′ positions. The structure of the F isomer was shown to involve both rotation of 180° about the central double bond and additional torsion about the four single bonds attached to it. The quantum yields for the A → B process are enhanced by external spin-orbit perturbers. The B isomer was shown to be formed from the triplet state. The formation of C, B and F are temperature controlled. Fluorescence quantum yields in these systems are strongly temperature dependent.
UR - http://www.scopus.com/inward/record.url?scp=0345672324&partnerID=8YFLogxK
U2 - 10.1016/0047-2670(76)85045-9
DO - 10.1016/0047-2670(76)85045-9
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AN - SCOPUS:0345672324
SN - 0047-2670
VL - 5
SP - 447
EP - 456
JO - Journal of Photochemistry
JF - Journal of Photochemistry
IS - 6
ER -