Asymmetric photolysis of biomolecules under high-intensity UV laser irradiation

The pH dependence of the anisotropy factors of essential amino acidsElectronic supplementary information (ESI) available: a table giving the precise pH and concentrations of amino acids, the UV spectra of Gly at various pHs, the UV, CD and g spectra of Pro at pH 13, the UV spectra of propane-1-thiol at various pHs and the CD spectra of L-Leu and L-Phe at various concentrations. See http://www.rsc.org/suppdata/p2/b1/b108575c/

“…For Tyr, our data (g max = g 270 = 0.0002) is in agreement with the g factor (g 266 = 0.000176) estimated by Nikogosyan et al using the % ee of Tyr generated by CPL irradiation using laser irradiation. 41 For histidine (His) and tryptophan (Trp) the chromophores are the common amine and carboxy groups, with a further imidazolyl and indolyl group, respectively, as the third chromophores. The pK a1 , pK a2 and pK a3 values are pK a1 : His 1.77, Trp 2.38, pK a2 : His 6.10, Trp 9.39, pK a3 : His 9.18.…”

Asymmetric photochemical reactions in solution

“…The apparent enhancement of the g factor would be interpreted by a much larger g factor for the first excited state or by the presence of a degenerated state whose sublevels differ slightly in energy. 70 Only one bimolecular asymmetric destruction/ production has been reported by Cavazza and Zandomeneghi.52 CPL irradiation of racemic 4-acetoxy-2cyclopentenone (22) in the presence of acetylene or 1hexyne gave optically active cycloadducts, 4-acetoxybicyclo[3.2.0]hept-6-en-2-ones, through the intermolecular [2 + 2] photocycloaddition. But only the chiroptical data are presented.…”