THEORETICAL AND EXPERIMENTAL MORPHOLOGIES OF 4-AMINOBENZOPHENONE (ABP) CRYSTALS

The lattice energy (E-latt), slice energies (E-slice) and attachment e nergies (E-att) of the different habit faces of ABP crystals have been calculated using the computer program HABIT. On the basis of the atta chment energies of different crystal faces, the morphology was defined as {1 0 0}, {0 0 1}, {1 1 0}, {1 (1) over bar 0} and {1 0 (1) over ba r}. To confirm this theoretical prediction, we have grown ABP films an d ABP crystals from the vapour phase. In both cases, the morphological ly most important face was defined as {1 0 0} face using X-ray diffrac tion techniques. The remaining faces of the vapour-grown crystals were defined using a projection method, while the crystallites in the film s were morphologically analysed by means of atomic force microscopy (A FM). The experimental morphologies are basically in agreement with the computation. Deviations from the equilibrium morphology can be ascrib ed to departure from equilibrium conditions during growth. For complet eness, the results are compared with those for crystals grown from sol utions for which deviations in morphology from the theoretical predict ions can be ascribed to interaction between the crystal faces and solv ent molecules.