NDLI: Polarized fluorescence of β-carotene and related polyenes

Content Provider	Springer Nature Link
Author	Bondarev, S. L. Knyukshto, V. N. Bachilo, S. M.
Copyright Year	2000
Abstract	The spectral and polarization characteristics of trans-isomers ofβ-carotene, lycopene, retinal, and 1,6-diphenylhexatriene (DPH) in solutions have been investigated by the methods of polarized fluorescence and semiempirical calculations of AM1 and RM3. The high and constant values of the degree of polarization P ∼0.46, closely coinciding with the limiting value P$_{0}$=0.5, according to the S$_{2}$→S$_{0}$-fluorescence and S$_{2}$←S$_{0}$-fluorescence excitation spectra ofβ-carotene and lycopene in n-hexane at room temperature and also high and coinciding according to the S$_{1}$→S$_{0}$-fluorescence and S$_{2}$←S$_{0}$-fluorescence excitation spectra for retinal in EPA at 77 K and DPH in a polyvinylbutyral film, point to the coincidence of the directions of absorption and emission oscillators. These oscillators are aligned along the major axis of the polyene molecule, and the longwave S$_{2}$←S$_{0}$-absorption band is formed only by one electronic$^{1}$B u + ←$^{1}$A g − -transition. The oscillators of shortwave S$_{a}$←S$_{0}$-absorption bands are aligned at an angle to the oscillators of the S$_{2}$←S$_{0}$-transitions, which is related to the distortions in the structure of molecules (β-carotene, lycopene) or, as in the case of DPH, to the influence of transitions localized on the orbitals of phenyl rings and polarized perpendicularly to the major axis of the molecule.
Starting Page	88
Ending Page	94
Page Count	7
File Format	PDF
ISSN	00219037
Journal	Journal of Applied Spectroscopy
Volume Number	67
Issue Number	1
e-ISSN	15738647
Language	English
Publisher	Springer US
Publisher Date	2000-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	fluorescence polarization polyene oscillator Analytical Chemistry Atomic and Molecular Structure and Spectra
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Condensed Matter Physics

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