Near-ir spectroscopic study of platinum(II) chelates with 2-aminobenzenethiol and its derivatives in aqueous micellar solutions and its application to the determination of trace platinum(II) ion

Tomoyuki Warashina, Hitoshi Hoshino

Research output: Contribution to journalArticle

1 Citation (Scopus)

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 languageEnglish
Pages (from-to)597-603
Number of pages7
JournalBUNSEKI KAGAKU
Volume59
Issue number7
DOIs
Publication statusPublished - 2010 Nov 19

Keywords

  • 2-aminobenzenethiol
  • Aqueous micellar system
  • Near-IR absorption
  • Platinum(II) determination

ASJC Scopus subject areas

  • Analytical Chemistry

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