Low Melting-Point 2-Pyridinium Styryl Dyes

Abstract

The melting point of 1-alkyl-2-[4-(dialkylamino)styryl]pyridinium dyes was found to depended on the counter anions and the alkyl substituents. The counter anion had the greater influence, with the melting point ranging from 249 to 81.6°C in 1-butyl-2-[4-(diethylamino)styryl]pyridinium dyes. Then, the melting point was affected by the alkyl substituents. 2-[4-(Didecylamino)styryl]-1- dodecylpyridinium bis(perfluorobutylsulfonyl)imide exhibited the lowest melting point at 27.2°C.