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]-1dodecylpyridinium bis(perfluorobutylsulfonyl)imide exhibited the lowest melting point at 27.2 C. Key-words: Styryl dyes, Low melting poin, Alkyl group, Counter anion Original Research Paper J. Jpn. Soc. Colour Mater., 87〔1〕,3–12(2014)
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