Kinetic spectrophotometric method for o-phenylenediamine in the presence of gold(III)

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• 作者：Ö ; zlen Altun ; Halide Akbaş ; ; Emre Dö ; len
• 关键词：Spectrophotometry ; Differential method ; Gold(III) ; o-Phenylenediamine ; Reaction kinetics
• 刊名：Spectrochimica Acta Part A ; Molecular and Biomolecular Spectroscopy
• 出版年：2007
• 期刊代码：99_13861425
• 类别：ch
• 出版时间：February 2007
• 卷：66
• 期：2
• 页码：499-502
• 文件大小：224 K

摘要

From the color developing reactions of o-phenylenediamine oxidizing agent and gold(III), the kinetic reactions between both of them in aquaeous solutions were studied using spectrophotometric and differential method. Light absorbances in the visible spectral range are measured as a function of mole fractions of phenylenediamine at a fixed gold(III) concentration and as a function of mole fraction of gold(III) at a fixed o-phenylenediamine concentration at periodic time internal. In the differential method, which was suggested by van’t Hoff, one deals with the actual rates of reactions as determined by measuring the slopes of absorbance–time curves. Optimum condition of the reaction were established as pH 6 at λ = 466 nm and room temperature. When the oxidation of o-phenylenediamine by gold(III) was investigated, it was observed that the following rate formula and rate constant were found: v=k[Au⁺³]^1/2[o-phenylenediamine]^1/2, k=2.33×10⁻² s⁻¹