Spectroscopic properties of spheroidene analogs having different extents of {pi}-electron conjugation

Journal Article · Thu Jan 09 00:00:00 EST 1997 · Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory

DOI:https://doi.org/10.1021/jp962373l· OSTI ID:501924

Frank, H A; Desamero, R Z.B.; Chynwat, V ^[1]; Gebhard, R; Hoef, I van der; Jansen, F J; Lugtenburg, J ^[2]; Gosztola, D ^[3]; Wasielewski, M R ^[3]

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1. Univ. of Connecticut, Storrs, CT (United States)
2. Leiden Univ. (Netherlands)
3. Argonne National Lab., IL (United States)

Spectroscopic properties of spheroidene and a series of spheroidene analogs were studied using steady-state absorption, fluorescence, fluorescence excitation, and time-resolved absorption spectroscopy. A systematic series of molecules that control energy transfer to bacteriochlorophyll is provided. The molecules were purified by high-pressure liquid chromatographic techniques. Absorption spectra were observed to red-shift with increasing extent of {pi}-electron conjugation. The transient data of the energy gap law for radiationless transitions allow a prediction of the S{sub 1} energies of the molecules. The process of light harvesting by carotenoids in photosynthesis is discussed. 44 refs., 8 figs., 3 tabs.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 501924
• Journal Information: Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory, Vol. 101, Issue 2; Other Information: PBD: 9 Jan 1997
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
66 PHYSICS
ORGANIC COMPOUNDS
ABSORPTION SPECTRA
EMISSION SPECTRA
FLUORESCENCE
CAROTENOIDS
PHOTOSYNTHESIS
ELECTRONIC STRUCTURE
ENERGY TRANSFER