Pyridinium N??Phenoxide Betaines and Their Application to the Characterization of Solvent Polarities, XX.–Synthesis, Solvatochromism, and Halochromism of …

C Reichardt, S Asharin??Fard…

Index: Reichardt, Christian; Asharin-Fard, Siamak; Schaefer, Gerhard Liebigs Annalen der Chemie, 1993 , # 1 p. 23 - 34

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Citation Number: 11

Abstract

Abstract Synthesis, negative solvatochromism (Table 1, Figure 1), and negative halochromism (Tables 2–3, Figures 2–3) of the new crown ether-substituted pyridinium N- phenolate betaine dyes 3–6 are described. In contrast to other known chromoionophores, 3– 5 exhibit a cation-selective negative halochromism, which manifests itself as a hypsochromic shift of the longwavelength intramolecular charge-transfer (CT) absorption band of the ...