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

作者：Warashina Tomoyuki^*; Hoshino Hitoshi

来源：Bunseki Kagaku, 2010, 59(7): 597-603.

DOI：10.2116/bunsekikagaku.59.597

• 2-aminobenzenethiol
• near-IR absorption
• platinum(II) determination
• aqueous micellar system

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, epsilon, of 7 to 8 x 10(4) M(-1) cm(-1), in the presence of iodine (1.0 x 10(-4) M). As compared with the platinum(II)-ABT complex (epsilon = 5.8 x 10(4) M(-1) cm(-1) at 735 nm), the absorption maxima (lambda(max)) of these ABT derivative complexes shift to longer wavelengths with increased molar absorptivities; the platinum(II)-4-BrABT complex has a value of epsilon = 7.5 x 10(4) 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.

• 出版日期2010-7