Abstract
The effects of experimental geometry on the theoretical polarizations of the S1←S0and S2 ← S0bands of π→π* type in riboflavin have been examined. Polarizations of these two bands are characterized by an angle between them in the range of 20 — 28° and are relatively insensitive to the input geometry. Thus the predicted polarizations are generally in agreement with fluorescence polarization spectrum of riboflavin at 77 °K. Alloxazine forms a strong complex with KI, and the fluorescence and phosphorescence from the charge transfer states have been characterized by means of luminescence and photoselection measurements. Riboflavin did not form a strong complex with KI, but it forms aggregates (dimer) more readily than alloxazine. The excited states of flavins can be populated by the weak dipole-dipole coupling mechanism of energy transfer from 1La states of indoles to the S2 state of flavins. The measured critical distances estimated from the fluorescence depolarization experiments range from 31 A for indole to 40 A for indole-2-carboxylic acid in glycerol-methanol mixture (9:1) at 263 °K.
| Original language | English |
|---|---|
| Pages (from-to) | 1011-1015 |
| Number of pages | 5 |
| Journal | Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences |
| Volume | 27 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sep 1 1972 |
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ASJC Scopus subject areas
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- Medicine(all)
Cite this
Molecular Luminescence Studies of Flavins, II : Interactions Involving the Excited States. / Song, Pill Soon; Moore, Thomas A; Kurtin, William E.
In: Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences, Vol. 27, No. 9, 01.09.1972, p. 1011-1015.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Molecular Luminescence Studies of Flavins, II
T2 - Interactions Involving the Excited States
AU - Song, Pill Soon
AU - Moore, Thomas A
AU - Kurtin, William E.
PY - 1972/9/1
Y1 - 1972/9/1
N2 - The effects of experimental geometry on the theoretical polarizations of the S1←S0and S2 ← S0bands of π→π* type in riboflavin have been examined. Polarizations of these two bands are characterized by an angle between them in the range of 20 — 28° and are relatively insensitive to the input geometry. Thus the predicted polarizations are generally in agreement with fluorescence polarization spectrum of riboflavin at 77 °K. Alloxazine forms a strong complex with KI, and the fluorescence and phosphorescence from the charge transfer states have been characterized by means of luminescence and photoselection measurements. Riboflavin did not form a strong complex with KI, but it forms aggregates (dimer) more readily than alloxazine. The excited states of flavins can be populated by the weak dipole-dipole coupling mechanism of energy transfer from 1La states of indoles to the S2 state of flavins. The measured critical distances estimated from the fluorescence depolarization experiments range from 31 A for indole to 40 A for indole-2-carboxylic acid in glycerol-methanol mixture (9:1) at 263 °K.
AB - The effects of experimental geometry on the theoretical polarizations of the S1←S0and S2 ← S0bands of π→π* type in riboflavin have been examined. Polarizations of these two bands are characterized by an angle between them in the range of 20 — 28° and are relatively insensitive to the input geometry. Thus the predicted polarizations are generally in agreement with fluorescence polarization spectrum of riboflavin at 77 °K. Alloxazine forms a strong complex with KI, and the fluorescence and phosphorescence from the charge transfer states have been characterized by means of luminescence and photoselection measurements. Riboflavin did not form a strong complex with KI, but it forms aggregates (dimer) more readily than alloxazine. The excited states of flavins can be populated by the weak dipole-dipole coupling mechanism of energy transfer from 1La states of indoles to the S2 state of flavins. The measured critical distances estimated from the fluorescence depolarization experiments range from 31 A for indole to 40 A for indole-2-carboxylic acid in glycerol-methanol mixture (9:1) at 263 °K.
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U2 - 10.1515/znb-1972-0901
DO - 10.1515/znb-1972-0901
M3 - Article
VL - 27
SP - 1011
EP - 1015
JO - Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
JF - Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
SN - 0932-0776
IS - 9
ER -