title: 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 lambda = 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 lambda = 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.
authors.affiliation: Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS, 91128 Palaiseau, France.
authors.forename: Claire
authors.initials: C
authors.lastname: Niezborala
authors.forename: François
authors.initials: F
authors.lastname: Hache