Influence of organic solvents on the habit of NMBA (4-nitro-4 '-methyl benzylidene aniline) crystals

The habits of NMBA crystals grown with 10 different organic solvents having different dipole moments were studied. Solubility of NMBA in all the above solvents at various temperatures in the range 293-318K was determined by G ravimetric method and the corresponding solubility coefficients at differen t growth temperatures were calculated. Crystals were grown by restricted ev aporation method. Crystals with three different habits were obtained viz; n eedles (one-dimensional), platelets (two-dimensional) and octahedral (three -dimensional). All the grown crystals were found to be monoclinic which was confirmed by X-ray powder diffraction analysis and the lattice parameters calculated from this study are in line with the literature value. (C) 2000 Published by Elsevier Science B.V. All rights reserved.