EXPERIMENTAL AND THEORETICAL MORPHOLOGIES OF DIURON, N'-(3,4-DICHLOROPHENYL)-N,N-DIMETHYLUREA

Crystals of diuron, N'-(3,4-dichlorophenyl)-N,N-dimethylurea, C9H10Cl2 N2O, were grown from ethanol at low supersaturation. The crystal faces were indexed using a two-circle optical goniometer and X-ray diffract ion was used to orientate the crystal morphology with respect to the u nit cell. The experimental morphologies were compared with the morphol ogies predicted by the BFDH (Bravais, Friedel, Donnay, Harker) and att achment energy (AE) methods and calculated from two crystal structures . Good agreement was obtained between experimental and theoretical hab its, despite the fact that the crystals exhibit 27 faces belonging to 13 crystallographic forms.