DAST, 1-methyl-4-{2-[4-(dimethylamino)phenyl]ethenyl}pyridinium p-toluenesulfonate, has been recently reported as an efficient THz-wave generator by difference frequency generation. In this study, two DAST derivatives, i.e., perdeuterated DAST (DAST-d
26) and DASC with p-chlorobenzenesulfonate replacing the p-toluenesulfonate of DAST, were investigated as model compounds to analyze the THz-wave intensity variation of DAST as a function of frequency. X-ray crystallographic analyses of DAST-d
26 and DASC were carried out for the first time, and it was found that both compounds gave crystals isomorphous with DAST. Their basic properties were also investigated.
We investigated terahertz (THz) properties of a new organic crystal, 4 0 -dimethylamino-N-methyl-4-stilbazolium p-chlorobenzenesulfonate (DASC). High-quality DASC crystals were grown using a slow-cooling method in methanol solution. Tunable THz waves over a wide range of 2 to 19 THz were generated in DASC crystals by difference-frequency mixing. The highest THz energy of 520 nJ was obtained at 11.3 THz. THz properties of DASC were compared with those of the conventional 4 0 -dimethylamino-N-methyl-4-stilbazolium tosylate (DAST).
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