Abstract
Halogeno derivatives of 2-aminobenzenethiol (ABT), 4-chloro-2-aminobenzenethiol (4-ClABT), 5-chloro-2-aminobenzenethiol (5-ClABT) and 4-bromo-2-aminobenzenethiol (4-BrABT) react with platinum(II) ion in aqueous Triton X-100 micellar solutions to form stable near-IR absorbing 1: 2 complexes with a molar absorptivity, ε, of 7 to 8 × 104 M-1 cm-1, in the presence of iodine (1.0 x 10-4 M). As compared with the platinum(II)-ABT complex (ε = 5.8 × 104 M-1 cm-1 at 735 nm), the absorption maxima (λmax) of these ABT derivative complexes shift to longer wavelengths with increased molar absorptivities; the platinum(II)-4-BrABT complex has a value of ε = 7.5 × 104 M-1 cm-1 at 759 nm. Consequently, the introduction of electron-withdrawing groups to the 4th position of the ABT ligand as near-IR colorimetric reagents is of great advantage to the trace analysis of platinum(II) ion.
Original language | English |
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Pages (from-to) | 597-603 |
Number of pages | 7 |
Journal | BUNSEKI KAGAKU |
Volume | 59 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2010 |
Keywords
- 2-aminobenzenethiol
- Aqueous micellar system
- Near-IR absorption
- Platinum(II) determination
ASJC Scopus subject areas
- Analytical Chemistry