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 revealed that all five materials have second-harmonic-generating properties with maximum efficiencies of approximately 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).

The structural confirmation of the (E)-1-(4-Chlorophenyl)-3-(4-methylphenyl)prop-2-en-1-one compound is done by experimental techniques. Experimental techniques FTIR, proton NMR, UV-Visible, performed for the compound. The experimentally obtained results are compared with theoretically (density functional theory) obtained results. The decomposition and melting point of the compound is obtained by TGA and DTA. Density functional theory is performed for the (E)-1-(4-Chlorophenyl)-3-(4-methylphenyl)prop-2-en-1-one compound B3LYP/6-311G++(d,p) basis set. Time dependent density functional theory calculated for three different methods B3LYP, Hartree-Fock and CAMB3LYP also employed for the MLCC at 6-311G++(d,p) basis set. The MLCC compound is having the total dipole moment 4.45 D. The static (ω=0.0) mean polarizability 17.40 x10-24 esu, anisotropic polarizability 23.37 x10-24esu, first hyperpolarizability 11.84 x10-30 esu, second hyperpolarizability 11.88x10-36 esu. Dynamic mean polarizability (ω=0.0569, ω= 0.04282) 17.84 x 10-24esu, 17.65x10-24esu. Dynamic anisotropic polarizability (ω=0.0569, ω= 0.04282) 24.26 x 10-24esu, 23.86 x10-24esu. Dynamic first hyperpolarizability (ω=0.0569, ω= 0.04282) 18.60 x 10-30 esu, 15.06 x10-30 esu. Dynamic second hyperpolarizability (ω=0.0569, ω= 0.04282) 35.37x10-36 esu, 20.0x10-36 esu.

The structural confirmation of the title compound is done by theoretical and experimental study. Experimental techniques such as FTIR, proton NMR, UV-Visible, thermal analysis (TGA & DTA) are employed. Density functional theory is used to analyze spectroscopic data scrutinized. Second order nonlinear optical parameters are obtained. The experimental results are analyzed with theoretically obtained data from density functional theory. TD-DFT also employed for the MLDCLC at different basis set. Keywords: DFT Study, nonlinear optical study, FTIR, 1H NMR

The structural confirmation of the 1-(4-Bromophenyl)-3-(2-chloro-6-fluorophenyl) prop-2-en-1-one compound is done by experimental techniques. Experimental techniques FTIR, proton NMR, UV-Visible, performed for the compound. The experimentally obtained results are compared with density functional theory obtained results. The decomposition and melting point of the compound is obtained by TGA & DTA. Density functional theory is performed for the 1-(4-Bromophenyl)-3-(2- chloro-6-fluorophenyl) prop-2-en-1-one compound B3LYP/6-311G++(d,p) basis set. Time dependent density functional theory calculated for three different methods B3LYP, Hartree-Fock and CAMB3LYP also employed for the 2C6FBC at 6-311G++(d,p) basis set. Keywords: DFT Study, HOMO-LUMO, FTIR, 1H NMR, TGA/DTA, chalcone