Comments on papers reporting IRspectra and other data of alleged Lalanine alaninium nitrate and Lalanine sodium nitrate crystals.

We argue that the IR and Ramanspectra of “Lalanine alaninium nitrate” given in “Investigation on the growth, optical behaviour and factor group of an NLO crystal: LAlanine Alaninium nitrate” by Aravindan et al., Cryst. Res. Technol. 42, 1097 2007, actually concern LAlanine. Correspondingly, the data presented in “A comparative study on the growth and characterization of nonlinear optical amino acid crystals: LAlanine LA and Lalanine alaninium nitrate LAAN” by Aravindan et al., Spectrochim. Acta A 71, 297 2008, seems to be erroneous, as is “Synthesis, Growth, and Characterization of a New Semiorganic Nonlinear Optical Crystal: LAlanine Sodium Nitrate LASN”, Sethuraman, et al., Cryst. Growth Des. 8, 1863 2008. In these papers properties and data were reported for LAlanine compounds that actually are LAlanine crystals and, in addition, unit cell parameters were given that seem to have been copied from other papers. © 2009 WILEYVCH Verlag GmbH & Co. KGaA, Weinheim [ABSTRACT FROM AUTHOR]