Abstract:
The glycine sodium nitrite crystal reported by Khandpekar and Pati in the paper entitled, 'Synthesis and characterisation of glycine sodium nitrite crystals having non linear optical behaviour' Opt. Commun. 285 (2012) 288-293 is actually gamma-glycine. In addition, we show that glycine bariumammonium nitrate (GABN), glycine sodium-zinc sulfate (GSZS), glycine barium calcium nitrate, glycine acetamide and glycine dimer are dubious crystals.