Synthesis, crystal structures and properties of new quinolinium derivatives

Four phenyl-substituted quinolinium salts with different counter anions, C 27 H 27 NO 4 S, C 26 H 25 NO 5 S, C 25 H 22 NO 5 SCl, and C 25 H 22 NO 5 SBr, were synthesized and their single crystals were successfully grown from methanol solution by slow evaporation. Single crystal X-ray diffraction analyses showed that C 27 H 27 NO 4 S crystal belongs to the noncentrosymmetric orthorhombic space group P na2 1 , and the other three crystals belong to centrosymmetric monoclinic space group P 2 1 /n. Their first order hyperpolarization and macroscopic nonlinearity were analyzed and physical properties were characterized by UV–vis absorption spectroscopy, and differential scanning calorimetric and thermal gravimetric analysis.