The novel pyridinium N-phenoxide betaine has been synthesised as its NaCl adduct 4 which has solvatochromic properties that are similar to those of the classic solvatochromic reagent 1(Reichardt's dye); the derived hydrochloride salt 5 extracts Na+ highly selectively from aqueous solutions into dichloromethane to form the purple NaCl adduct 4.
M. Dolman and I. O. Sutherland, J. Chem. Soc., Chem. Commun., 1993, 1793 DOI: 10.1039/C39930001793
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