Syntheses and UV/Vis??Spectroscopic Properties of Hydrophilic 2??, 3??, and 4??Pyridyl??Substituted Solvatochromic and Halochromic Pyridinium N??Phenolate Betaine …

C Reichardt, D Che, G Heckenkemper…

Index: Reichardt, Christian; Che, Daqing; Heckenkemper, Guido; Schaefer, Gerhard European Journal of Organic Chemistry, 2001 , # 12 p. 2343 - 2361

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Citation Number: 39

Abstract

Abstract Syntheses and negative solvatochromism of nine new hydrophilic 2-, 3-, and 4- pyridyl-substituted pyridinium N-phenolate betaine dyes 3− 11 are described. These were produced in order to obtain zwitterionic dyes better soluble in water and other aqueous media (such as binary water/solvent mixtures, aqueous ionophore solutions) than the rather hydrophobic standard betaine dyes 1 and 2, which have been used to establish an ...