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

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  • Warashina Tomoyuki
    Department of Environmental Studies, Graduate School of Environmental Studies, Tohoku University Department of Chemistry and Biochemistry, Numazu National College of Technology
  • Hoshino Hitoshi
    Department of Environmental Studies, Graduate School of Environmental Studies, Tohoku University

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Other Title
  • ２‐アミノベンゼンチオール及びその誘導体を配位子とする白金（ＩＩ）錯体の近赤外光吸収特性評価とその微量白金（ＩＩ）イオン定量への応用
  • 2-アミノベンゼンチオール及びその誘導体を配位子とする白金(2)錯体の近赤外光吸収特性評価とその微量白金(2)イオン定量への応用
  • 2 アミノベンゼンチオール オヨビ ソノ ユウドウタイ オ ハイイシ ト スル ハッキン 2 サクタイ ノ キン セキガイコウ キュウシュウ トクセイ ヒョウカ ト ソノ ビリョウ ハッキン 2 イオン テイリョウ エ ノ オウヨウ

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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 × 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.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 59 (7), 597-603, 2010

    The Japan Society for Analytical Chemistry

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