Abstract
AbstractIn this study, an organic nonlinear optical salt crystal, 4‐(4‐methoxystyryl)‐1‐methylpyridinium 4‐bromobenzenesulfonate (MOS‐BBS), is newly reported. MOS‐BBS crystals exhibit perfectly parallel molecular ordering of 4‐(4‐methoxystyryl)‐1‐methylpyridinium (MOS) cationic chromophores with noncentrosymmetric P1 space group symmetry, which provides an optimal configuration for maximizing the macroscopic second‐order optical nonlinearity. The macroscopic optical nonlinearity of the MOS‐BBS crystals is very large, with the diagonal effective first hyperpolarizability of 160 × 10−30 esu. Furthermore, the MOS‐BBS crystals exhibit a high thermal crystal‐phase stability. The lowest phase transition temperature of the MOS‐BBS crystals is 265°C, which is ~90°C higher than that of previously reported MOS‐based crystals.
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