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Complexation of Titanium (IV) with 4-Nitrocatechol and Tetrazolium Salts Tetrazolviolet and Iodonitrotetrazolium Chloride

S. Kostova, A. Dimitrov, and A. Alexandrov

Department of General and Inorganic Chemistry, University of Plovdiv, 4000 Plovdiv, Bulgaria


Abstract: The extraction of the ion-associates of titanium(IV) with 4-nitrocatechol and the tetrazolium salts tetrazolviolet and iodonitrotetrazolium chloride has been studied. The optimum extraction conditions and the effect of diverse ions have been established. The mole ratio between Ti(IV), 4-nitrocatechol, and tetrazolium salts was 1:2:2. Beer's law was obeyed over the range of 0.172-2.044 μ g cm-3 for ion association complex with iodonitrotetrazolium chloride. (INT), and 0,20- 2.00 μg cm-3 with tetrazolviolet (TV). The molar absorption coefficients (ε) observed are: for the ion-associate with INT 2.38 x 104 dm3 mol-1 cm-1 at lambda = 430 nm and for the associate with TV 4.40 x 104 dm3 mol-1 cm-1 at λ = 440 nm. The ion-associates were applied to extraction-spectrophotometric determination of titanium in aluminium alloys.

Full paper in Portable Document Format: 542a66.pdf


Chemical Papers 54 (2) 66–71 (2000)

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