Abstract
The authors of the title paper (J.Mol. Struc.1207 (2020) 127750) claim to have grown a novel organic nonlinear optical (NLO) toluidine tartrate (TT) single crystal. In this letter to the Editor, we prove that the so-called TT crystal is not a novel NLO material but is in fact, the well-known colorless 1:1 salt of p-toluidine and l-tartaric acid. The title crystal's brown color is due to extensive surface degradation.
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