Comment on "Synthesis, growth, structural, spectroscopic, crystalline perfection, second harmonic generation (SHG) and thermal studies of 2-aminopyridinium picrate (2APP): A new nonlinear optical material" [Solid State Sci.14 (2012) 773-776]
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Comment on "Synthesis, growth, structural, spectroscopic, crystalline perfection, second harmonic generation (SHG) and thermal studies of 2-aminopyridinium picrate (2APP): A new nonlinear optical material" [Solid State Sci.14 (2012) 773-776]
The compound 2-aminopyridinium picrate (2APP) reported by Shkir et al. (Solid State Sci. 14 (2012) 773-776) is a centrosymmetric solid and not a nonlinear optical material.