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Hydrogen‐bonding interactions in fully deuterated α‐glycine at high pressures
Author(s) -
Sharma Bharat Bhooshan,
Murli Chitra,
Chitra R.,
Sharma Surinder M.
Publication year - 2012
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2994
Subject(s) - deuterium , hydrogen bond , raman spectroscopy , chemistry , context (archaeology) , glycine , hydrogen , stiffening , crystallography , amino acid , molecule , materials science , organic chemistry , atomic physics , optics , physics , composite material , paleontology , biochemistry , biology
Recent spectroscopic investigations of various amino acids report intriguing high‐pressure and low‐temperature behavior of NH 3 + groups and their influence on various hydrogen bonds in the system. In particular, the variation of the intensity of NH 3 + torsional mode at different temperatures and pressures has received much attention. We report here the first in situ Raman investigations of fully deuterated α‐glycine up to ∼20 GPa. The discontinuous changes in COO − and ND 3 + modes across ∼3 GPa indicate subtle structural rearrangements in fully deuterated α‐glycine. The decrease in the intensity of ND 3 + torsional mode is found to be similar to that of undeuterated α‐glycine. The pressure‐induced stiffening of ND and CD 2 stretching modes are discussed in the context of changes in the hydrogen‐bonding interactions. Copyright © 2011 John Wiley & Sons, Ltd.