EXPERIMENTAL VIBRATIONAL SPECTROSCOPIC AND THEORETICAL ( AB INITIO CALCULATIONS ) STUDIES OF THE PEPTIDE L-VALL-VAL

There are, to our knowledge, no reports in the scientific literature on the vibrational spectroscopic and X-ray properties of the linear peptide L-Val-L-Val. Raman and infra-red spectra have, however, been recorded for larger, alternating peptides containing L-Val-D-Val [1]. Vibrational and X-ray studies have also been reported on other linear di-amino acid peptides such as L-Ala-Gly [2, 3] and Gly-Gly [2]. This contribution is part of a long term study of the vibrational characteristics of the cis amide conformation found in cyclic di-amino acid peptides and the trans amide conformation found in linear di-amino acid peptides.