Spectroscopic Studies of Glycinium Oxalate under Pressure.

We report the first high pressure study on Glycinium oxalate complex up to 6 GPa. High pressure infrared and Raman spectroscopic measurements have been carried out in the spectral range 600 - 3600 cm^-1. Most of the skeletal and internal vibrational modes lying in the complex 600 - 1200 cm^-1 region have been reassigned and their high pressure behavior has been discussed. The spectra indicate subtle pressure induced transformations at 0.7 GPa and 2.5 GPa, with significant changes in the hydrogen bonding network. [ABSTRACT FROM AUTHOR]