VIBRATIONAL-SPECTRA AND PHASE-TRANSITION IN TRIGLYCINE SULFO-PHOSPHATE

Infrared and single crystal Raman spectra for various polarization geometries of Triglycine Sulpho-Phosphate (TGSP) have been recorded and analysed. The bonds of hydrogen atoms in H2SO4 and H3PO4 groups are shown to be weak and the possibility of proton transfer from H2SO4/H3PO4 group is indicated. Two different types of glycinium ions are shown to be present in the unit cell. Temperature dependent Raman spectra of TGSP have been recorded. The phase transition detected around 325 K in TGSP is explained in terms of the flipping motion of the glycinium ion and of attaining a higher crystal symmetry.