Design, synthesis and characterization of two new nonlinear optical crystals based on chalcone containing furan ring: FTB and FTC

Two novel chalcone crystals, FTB (C 13 H 9 BrO 2 , P 2 1 ) and FTC (C 13 H 9 ClO 2 , Pna 2 1 ), were successfully synthesized by introducing halogen substituents, and slow evaporation method was used for these two crystals growth. The molecular stacking and arrangement of these two crystals were analyzed by using single-crystal XRD technique. The SHG intensities of the FTB and FTC crystals were 14.4 and 12.6 times higher than the simultaneously measured KDP. Their cutoff wavelengths are 350 nm and 346 nm, respectively. FTC crystals show higher thermal decomposition temperature (T m ≈ 146 °C) and FTB crystals show higher optical energy gap (E g = 3.63 eV) than other reported chalcone crystals. All the results show that these two newly grown crystals are optically promising.