Conformational changes in photoexcited (R)-(+)-1,1'-bi-2-naphthol studied by time-resolved circular dichroism

Abstract : Conformational changes following photoexcitation of (R)-(+)-1,1′-bi-2-naphthol are studied with a time-resolved circular dichroism (CD) experiment. Two wavelengths are investigated. For λ = 237 nm, we observe a bleaching of the ground-state absorption and a transient CD structure. Thanks to a coupled-oscillator calculation, we can attribute this effect to a decrease of the dihedral angle. For λ = 245 nm, excited-state absorption and CD are observed. All these effects are solvent-dependent. In particular, it is shown that dynamics is slower in a protic solvent, which is attributed to hydrogen-bonding of the hydroxy groups with the solvent.
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Submitted on : Wednesday, September 24, 2008 - 2:04:32 PM
Last modification on : Thursday, February 7, 2019 - 5:19:31 PM

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Claire Niezborala, François Hache. Conformational changes in photoexcited (R)-(+)-1,1'-bi-2-naphthol studied by time-resolved circular dichroism. Journal of the American Chemical Society, American Chemical Society, 2008, 130 (38), pp.12783-12786. ⟨10.1021/ja8039844⟩. ⟨hal-00324218⟩

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