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Chromoionophoric Pyridinium‐ N ‐phenolate Betaine Dyes
Author(s) -
Reichardt Christian,
AsharinFard Siamak
Publication year - 1991
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199105581
Subject(s) - hypsochromic shift , betaine , pyridinium , chemistry , absorption (acoustics) , ether , electrolyte , crown ether , photochemistry , medicinal chemistry , inorganic chemistry , nuclear chemistry , organic chemistry , ion , fluorescence , optics , physics , electrode
The halochromism of the crown‐ether‐substituted betaine dyes 1 is very sensitive to the cation size of the added electrolytes. The strongest hypsochromic shift of the longest‐ wavelength UVIVIS absorption results for n = 0 with Na ⊕ , n = 1 with K ⊕ , and n = 2 with Cs ⊕ . Thus, the dyes 1 may be useful as indicators.