Ultraviolet resonance Raman studies of trans and cis peptides: photochemical consequences of the twisted. pi.* excited state

…, SA Asher, S Krimm, KD Shaw

Index: Song, Sunho; Asher, Sanford A.; Krimm, Samuel; Shaw, Keith D. Journal of the American Chemical Society, 1991 , vol. 113, # 4 p. 1155 - 1163

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Citation Number: 89

Abstract

Abstract: Excitation into the amide PT* transitions of N-methylacetamide (NMA) and small peptides such as di-and triglycine results in the photochemical conversion of the trans- amides into cis-amides with a high quantum yield. The cis form of NMA is easily monitored since its amide 11 UV Raman cross section is ca. IO-fold larger than that of the trans peptide with 220-nm excitation. We can detect the ca. 1.5% Boltzmann population of the cis form of ...