Comment on the paper “Investigation on synthesis, growth and characterization of Glycine oxalate: An organic nonlinear crystal for optical applications”

Abstract

It is shown that the title paper reported by M.M. Wezhli et al. (Optik 127 (2016) 4258–4260) is completely erroneous. The so-called “glycine oxalate dihydrate” crystal is not a new crystal but instead is the well-known anhydrous glycinium hydrogen oxalate crystal.