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    Development of spectrophotometric determination method for Au(III) and Ag(I)
    (Marmara Univ, Fac Pharmacy, 2017) Erdogan, Gulbin; Dolen, Emre; Ibar, Hilmi
    In this research, a potentiometric and spectrophotometric method was developed to determine Ag(I) and Au(III) based on their reaction with m and p-phenylenediamine. As a result reactions between Ag(I) and Au(III) and m-and p-phenylenediamine mixtures was revealed that, there is an oxidation by means of complexation via oxidation, a diazo compound occured from amines and Ag(I) was reducted to elementel form, Au(III) was reducted to Au(I). Also the formation conditions of the reactions of these metals with amines were investigated, the pH range that the reactions took place, time needed for the formation of the reactions and the mol ratios needed for the complete reaction of the metals with amines. Mole ratios were determined as follows: Ag(I) / (m+p) phenylenediamine= 1; Au(III) / (m+p) phenylenediamine= 1/2
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    Kinetic spectrophotometric method for o-phenylenediamine in the presence of gold(III)
    (Pergamon-Elsevier Science Ltd, 2007) Altun, Ozlen; Akbas, Halide; Dolen, Emre
    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 lambda = 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 x 10(-2) s(-1) (c) 2006 Elsevier B.V. All rights reserved.