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.
| Original language | English |
|---|---|
| Pages (from-to) | 3456-3461 |
| Number of pages | 6 |
| Journal | Journal of the American Chemical Society |
| Volume | 119 |
| Issue number | 15 |
| Publication status | Published - 16 Apr 1997 |
Keywords
- RESPONSIVE FLUORESCENT COMPOUNDS
- LANGMUIR-BLODGETT-FILMS
- PHOTOPHYSICAL PROPERTIES
- CROWNED SPIROBENZOPYRAN
- MACROCYCLE INTERACTION
- COMPLEX-FORMATION
- METAL-CATIONS
- KINETIC DATA
- BINDING
- PHOTOISOMERIZATION