Comments on 'Process development and characterization of centrosymmetric semiorganic nonlinear optical crystal: 4-dimethylaminopyridine potassium chloride'

Abstract

The authors of the title paper [Phys B. Condens. Matter 538 (2018) 199-206) report to have grown 4-dimethylaminopyridine potassium chloride (4-DMAPKC) crystal by slow evaporation solution growth method. In this communication, many points of criticism, concerning the crystal growth, single crystal structure and X-ray powder pattern of this so called 4-DMAPKC crystal are highlighted to prove that the title paper is completely erroneous and the title crystal is potassium chloride.