Preparation, properties and structures of 1-methyl-4-{2-[4-(dimethylamino)phenyl]ethenyl}pyridinium crystals with various counter anions

Modification of DAST-based compounds toward enhanced terahertz-wave generation

“…Counter-anion exchange reactions (Reaction C) were conducted referring to the previous studies [12]. Structures of the compounds obtained were confirmed by IR and 1 H-NMR spectra.…”

Development of DAST-derivative crystals for terahertz waves generation

“…2 shows the solubility curves in the range of 35-60 1C. The solubility of DAST derivatives is generally affected by the terminal functional group of the ions [17,27]. Thus, MOPT and MONT with a methoxy group have high solubility to methanol.…”

“…Therefore, new NLO materials are desired in order to generate THz waves that cover the spectral range of 0.5-3 THz without absorption. Although several DAST derivative compounds with large NLO properties have been reported [16][17][18][19], there have been few investigations into the crystallization and THz generation [16,20].…”

Growth, structural, optical and thermal properties of potential THz material: N, N-dimethylamino-N′-methylstilbazolium 4-styrenesulphonate

“…For crystal growth from solution, appropriate solubility of the crystal is required [10]. The studies on the property variation caused by anion exchange are considered as an interesting subject to find out new compounds not only with large NLO properties but also with easy crystalgrowing ability [11].…”

“…But unfortunately, only polycrystalline DSSS was obtained by slow evaporation technique, even though the material was well-dissolved in DMF. In another attempt, Ogawa et al [11] have adopted a different approach to synthesize DSSS by the anion exchange reaction of N,N-dimethylamino-N-methylstilbazolium iodide (DASI) with silver arylsulfonate. Using this procedure, tiny DSSS crystals of size up to 0.5 mm were obtained.…”