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Issue 13, 2010
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Excited state properties of aryl carotenoids

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Excited-state properties of aryl carotenoids, important components of light harvesting antennae of green sulfur bacteria, have been studied by femtosecond transient absorption spectroscopy. To explore effects of the conjugated aryl group, we have studied a series of aryl carotenoids with conjugated ϕ-ring, chlorobactene, β-isorenieratene and isorenieratene, and compared them with their non-aryl counterparts γ-carotene and β-carotene, which contain β-ring. Changing β-ring to ϕ-ring did not reveal any changes in absorption spectra, indicating negligible effect of the ϕ-ring on the effective conjugation length. This observation is further supported by the carotenoid S1 lifetimes. In n-hexane, the S1 lifetime of chlorobactene having one ϕ-ring is 6.7 ps, while the S1 lifetime of the β-ring analog, γ-carotene is 5.4 ps. The same effect is observed for the series β-carotene (two β-rings), β-isorenieratene (one β- and one ϕ-ring) and isorenieratene (two ϕ-rings) whose S1 lifetimes in n-hexane are 8.2, 10.3 and 12.7 ps, respectively. The systematically longer lifetimes of aryl carotenoids show that the additional conjugated C[double bond, length as m-dash]C bonds at the ϕ-ring do not contribute to the conjugation length. The S1 lifetimes of aryl carotenoids were slightly shortened in benzene, indicating π–π stacking interaction between the ϕ-ring and benzene.

Graphical abstract: Excited state properties of aryl carotenoids

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The article was received on 13 Oct 2009, accepted on 22 Jan 2010 and first published on 23 Feb 2010

Article type: Paper
DOI: 10.1039/B921384H
Citation: Phys. Chem. Chem. Phys., 2010,12, 3112-3120
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    Excited state properties of aryl carotenoids

    M. Fuciman, P. Chábera, A. Župčanová, P. Hříbek, J. B. Arellano, F. Vácha, J. Pšenčík and T. Polívka, Phys. Chem. Chem. Phys., 2010, 12, 3112
    DOI: 10.1039/B921384H

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