A series of five chalcone derivatives with different substituents in para and meta posions have been synthesized, and single crystals were successfully grown in aceton solution by slow evaporation solution growth technique (SESGT). Single crystal X-ray studies revealed that all the crystals crystallized in noncentrosymmetric space group with their molecular dipoles perfectly aligned in a direction - favorable for large nonlinear optical effects. Kurtz powder tests re vealed that all five materials have second-harmonic-generating properties with maximum efficiencies of approxima tely 14 times that of urea standard. UV - vis-NIR spectroscopy and thermogravimetric analyses are also presented for all of the reported materials. Among the five chalcones, high quality single crystals of 4-Methoxy - 4 ' -chlorochalcone were grown by SESGT, and its crystalline perection were studied by using a high resolution X - ray diffractometry (HRXRD).
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