THE POLARIZED PHOSPHORESCENCE SPECTRA OF FLAVINS AT $77^{\circ}K$.
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Date
1969
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Ohio State University
Abstract
Song, Pill-Soon Department of Chemistry Texas Technological College riboflavin and alloxazine were measured in ethylene glycol-water (2:1, v/v) at $77^{\circ}K$ in order to assign the lowest triplet state and $(n, \pi^{\ast})$ singlet state. It was found that the region of the spectrum around the 0-0 emission band is positively polarized with respect to the 350 nm singlet-singlet transition moment(s). Since it was also shown that the phosphorescence emission is negatively polarized with respect to the lowest singlet ($\pi, \pi^{\ast}$) and the phosphorescence excitation at 350 nm is positively polarized, the results are consistent with the triplet state being ($\pi, \pi^{\ast}$) and with the 350 nm band being of $(n, \pi^{\ast})$ character. The source of the triplet-singlet transition moments of flavins has also been studied by calculating one-center spin orbit matrix elements of the $^{1}(n, \pi^{\ast})-^{3}(\pi, \pi^{\ast}$) coupling.
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This research was supported by the National Science Foundation Grant No. GB-8055.
Author Institution: Department of Chemistry, Texas Technological College
Author Institution: Department of Chemistry, Texas Technological College