Synthesis, Crystal  Growth and Characterization of Nonlinear Optical( NLO)  Materials by Theory  and  Experiment:  Our primary interest   is  to synthesize some  new  Semiorganic  NLO  materials. We first check the possibility of presence of nonlinear optical properties in these materials by Theoretical studies followed by molecular  structure determination  by single crystal X-ray diffraction method. If the materials are found optically nonlinear then we grow large size single crystals  of these materials by slow cooling solution growth method and study the  optical, thermal and mechanical properties of these as-grown crystals to check the suitability of these NLO crystals for fabrication of devices.