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Pyridinium N ‐Phenoxide Betaines and Their Application to the Characterization of Solvent Polarities, XIX. The Halochromism of Pyridinium N ‐Phenoxide Betaine Dyes in Acetonitrile Solution
Author(s) -
Reichardt Christian,
Asharin;Fard Siamak,
Schäfer Gerhard
Publication year - 1993
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19931260122
Subject(s) - chemistry , betaine , pyridinium , solvatochromism , acetonitrile , medicinal chemistry , solvent , inorganic chemistry , organic chemistry
The halochromism of the negatively solvatochromic pyridinium N ‐phenoxide betaine dye 1 has been measured in acetonitrile solution and linearly correlated with the effective charge of the cations of the added alkaline and alkaline earth salts. The observed negative halochromism of betaine dye 1 constitutes a new type of true halochromism, in contrast to the trivial halochromism found for the first time by Baeyer and Villiger in 1902.