Molecular Luminescence Studies of Flavins, II

Interactions Involving the Excited States

Pill Soon Song, Thomas A Moore, William E. Kurtin

Research output: Contribution to journalArticle

27 Citations (Scopus)

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 languageEnglish
Pages (from-to)1011-1015
Number of pages5
JournalZeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
Volume27
Issue number9
DOIs
Publication statusPublished - Sep 1 1972

Fingerprint

Flavins
Riboflavin
Luminescence
Excited states
Polarization
Fluorescence
Luminescent Measurements
Indoles
Fluorescence Polarization
Energy Transfer
Phosphorescence
Glycerol
Methanol
Geometry
Depolarization
Dimers
Energy transfer
Charge transfer
isoalloxazine
Experiments

ASJC Scopus subject areas

  • Chemistry(all)
  • 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 journalArticle

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