A novel pyridinium betaine derivative of a phenolic cryptand

Abstract

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.