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

Infrared and single crystal Raman spectra for various polarization geo metries of Triglycine Sulpho-Phosphate (TGSP) have been recorded and a nalysed. The bonds of hydrogen atoms in H2SO4 and H3PO4 groups are sho wn 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 T GSP 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.