Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.002 Å; R factor = 0.043; wR factor = 0.107; data-to-parameter ratio = 17.3.In the title compound, C 8 H 11 N 2 S + ÁC 12 H 10 NO 3 S À , the NH group of the S-benzylthiuronium is protonated and the interplanar angle between the phenyl ring and the CH 2 -S C(NH 2 ) 2 unit is 47.44 (10) . In the 4-anilinobenzenesulfonate anion, the interplanar angle between the two rings is 44.07 (8) . In the crystal structure, anions are linked into chains along the c-axis direction by N-HÁ Á ÁO hydrogen bonds, while additional N-HÁ Á ÁO interactions link the cations to the anions in chains along the b-axis direction. These chains are further interconnected into a two-dimensional network parallel to the bc plane by C-HÁ Á ÁO interactions. C-HÁ Á Á contacts are also observed. Related literature

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In our present study, we attempted to grow the single crystals of (2E)-1-(4-chlorophenyl)-3-[4-(methylsulfanyl)phenyl]prop-2-en-1-one by making use of the slow evaporation solution growth technique at room temperature. But the single crystal X-ray diffraction technique revealed that the grown crystal was a co-crystal with molecular formula C 16 H 13 Br 0.66 Cl 0.34 OS (4Br4MSP/4Cl4MSP). The presence of functional groups in the molecular structure is confirmed by Fourier transform infrared (FT-IR) spectroscopy. The UVÀvisÀNIR absorption spectrum shows that this co-crystal has a good transparency window for optical application. Second harmonic generation (SHG) analysis was done to explore nonlinear optical (NLO) characteristics of the material, and the co-crystal was found to have the highest SHG efficiency when compared with all the co-crystals reported in the literature.difficult to mention a suitable technique for a particular cocrystal to synthesize, unless it is confirmed by trial and error methods. 12,13 In this paper, we deal with the co-crystal of chalcone: its synthesis, growth, characterization, and structureÀNLO property relationship. The co-crystal obtained has co-formers, namely, (2EThe molecular structure of the co-crystal is given by C 16 H 13 Br 0.66 OS/C 16 H 13 Cl 0.34 OS (4Br4MSP/4Cl4MSP). The co-crystal is a donor-π-acceptor-π-donor (D-π-A-π-D) type of the molecule, and SHG efficiency is found to be greater than that of any of the co-crystals so far reported to our best knowledge. EXPERIMENTAL PROCEDURES Synthesis and Growth. The standard technique ClainsenÀSchmidt condensation method was used to synthesize the chalcone

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