Abstract:
We show that a recently published paper "Spectroscopic evaluation of Alanine Adipate nonlinear optical materials growth dynamics: Mechanical and thermal optimization" (S. Akilandeswari, L. Jothi, J. Mol. Struct. 1240 (2021) 130577) is completely erroneous. A so-called "alanine adipate" actually is adipic acid, which is centrosymmetric and therefore cannot be a nonlinear optical crystal showing second harmonic activity.