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A cation-specific, light-controlled transient chromoionophore based on a benzothiazolium styryl azacrown ether dye

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JournalJournal of the American Chemical Society
DatePublished - 16 Apr 1997
Issue number15
Volume119
Number of pages6
Pages (from-to)3456-3461
Original languageEnglish

Abstract

A benzothiazolium styryl azacrown ether dye (1) and its complexation with Ba2+ and Na+ cations in acetonitrile solution have been studied by UV-vis absorption and emission spectroscopy, trans-1 is found to act as a normal chromoionophore for Ba2+ and Na+ at high concentration (greater than or equal to 10(-2) M) by complexation with the azacrown and as a light-controlled, transient chromoionophore specific for Ba2+ at low concentration (10(-5)-10(-3) M). A quantitative analysis of the complexation and thermal reactions following photolysis has enabled a detailed mechanism to be proposed: trans-1 photoisomerization produces cis-1, which is stabilized in the presence of Ba2+ by dual intramolecular complexation of the cation with both azacrown and sulfonate groups.

    Research areas

  • RESPONSIVE FLUORESCENT COMPOUNDS, LANGMUIR-BLODGETT-FILMS, PHOTOPHYSICAL PROPERTIES, CROWNED SPIROBENZOPYRAN, MACROCYCLE INTERACTION, COMPLEX-FORMATION, METAL-CATIONS, KINETIC DATA, BINDING, PHOTOISOMERIZATION

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