THE ROTAMERIZATION OF CONFORMERS OF GLYCINE ISOLATED IN INERT-GAS MATRICES - AN INFRARED SPECTROSCOPIC STUDY

The infrared spectra of glycine isolated in Ne, Ar and Kr matrices hav e been measured. The matrix-isolated glycine is shown to be in the mol ecular form. The spectral manifestations, both conformational and site splitting, are separated. Three different conformers of glycine have been identified experimentally for the first time. It is shown that du ring the deposition of the samples the substrate temperature must be l owered to 13 K - this is a decisive factor permitting fixation of a co mplete set of glycine conformers in an inert matrix. The relative ener gies of the three glycine conformers are estimated to be 0, 1.3-1.6 an d 0.9-1.5 kcal/mol.