TY - JOUR
T1 - Ultraviolet spectra of coumarins and psoralens
AU - Moore, Thomas A.
AU - Harter, Marian L.
AU - Song, Pill Soon
N1 - Funding Information:
1 This work was supported in part by the Robert A. Welch Foundation (Grant D-182) and the National Science Foundation (Grant GB-21266). 2 An NSF predoctoral trainee (lQ6&1972). 8 A Robert A. Welch Foundation Predoctoral Fellow (1971-1972). * To whom reprint requests may be addressed.
PY - 1971/10
Y1 - 1971/10
N2 - The π → π* transitions of coumarins in the ultraviolet region have been described on the basis of fluorescence polarization, dichroic spectra, and SCF MO CI results. The two lowest π → π* transitions in coumarin, 4-hydroxy-coumarin, and psoralen were found to be polarized nearly parallel to each other, probably along the long molecular axis. The two lowest π → π* transition moments in 8-methoxypsoralen were found to be oriented with a substantial angle between them, in contrast to the case of coumarin and psoralen. It was not possible to identify any n → π* bands as they are probably obscured by the strong π → π* bands.
AB - The π → π* transitions of coumarins in the ultraviolet region have been described on the basis of fluorescence polarization, dichroic spectra, and SCF MO CI results. The two lowest π → π* transitions in coumarin, 4-hydroxy-coumarin, and psoralen were found to be polarized nearly parallel to each other, probably along the long molecular axis. The two lowest π → π* transition moments in 8-methoxypsoralen were found to be oriented with a substantial angle between them, in contrast to the case of coumarin and psoralen. It was not possible to identify any n → π* bands as they are probably obscured by the strong π → π* bands.
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U2 - 10.1016/0022-2852(71)90016-6
DO - 10.1016/0022-2852(71)90016-6
M3 - Article
AN - SCOPUS:0000926480
VL - 40
SP - 144
EP - 157
JO - Journal of Molecular Spectroscopy
JF - Journal of Molecular Spectroscopy
SN - 0022-2852
IS - 1
ER -