Mechanism of energy transfer from carotenoids to bacteriochlorophyll: light-harvesting by carotenoids having different extents of pi-electron conjugation incorporated into the B850 antenna complex from the carotenoidless bacterium Rhodobacter sphaeroides R-26.1

Article Abstract:

Research was conducted to examine the mechanism of energy transfer from carotenoids to bacteriochlorophyll. Spheroidene and a series of spheroidene analogues with extents of pi-electron conjugation ranging from 7 to 13 carbon-carbon double bonds were integrated into the B850 light-harvesting complex of Rhodobacter sphaeroides R-26.1. Results indicate that the S2 state related to the Q(sub x) transition of the B850 BChl is the most possible acceptor state for energy transfer that originates from both the 2(super 1)A(sub g) (S1) and 1(super 1)B(sub u) (S2) states of all carotenoids.

Research, Carotenoids, Bacteria, Energy transfer, Electron configuration

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Effect of isomer geometry on the steady-state absorption spectra and femtosecond time-resolved dynamics of carotenoids

Article Abstract:

The effect of isomer geometry on the spectroscopic properties and photophysics of the low-lying carotenoids is examined using steady-state absorption and femtosecond time-resolved optical spectroscopy. The effects are described in terms of minor alterations in the excited-state energy and vibrational coupling upon isomerization that bring about changes in the spectroscopic and kinetic behavior of this biologically important class of pigments.

Netherlands, Isomerization, High performance liquid chromatography, Chemical properties, Isomerism, Isomers (Chemistry)

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Femtosecond time-resolved transient absorption spectroscopy of xanthophylls

Article Abstract:

An ultrafast time-resolved spectroscopic investigation of all the major xanthophyll pigments from spinach is conducted. The experimental data demonstrate the inherent spectral properties and ultrafast dynamics including the S1 state lifetimes of each of the pigments.

Spectra, Oxidation-reduction reaction, Oxidation-reduction reactions, Absorption spectra, Xanthophyll

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