Abstract
AbstractTwo methods for the synthesis of N‐[4‐(2,4,6‐triphenyl‐1‐pyridinio)phenyl]‐p‐toluenesulfonaminide (4), a new betaine dye with positive and negative charges at two nitrogen atoms separated by an aromatic ring, are described. 4 displays a negative solvatochromic effect slightly smaller than that observed for the standard betaine 1 [ET(30) scale]. X‐ray structure determination of crystals containing 4 and acetone solvate molecules in the molar ratio of 1:1 revealed that the geometry of the pyridinium moiety is strongly influenced by the negatively charged aminide nitrogen atom.
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