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Study on the Complex Formation and the Ion-Association of Anionic Chelate of Molybdenum(VI) with Bidentate Ligand and the Cation of 2,3,5-Triphenyl-2Н-tetrazolium chloride

Vanya Lekova, Kirila Stojnova, Petya Racheva, Vidka Divarova, Pavel Yanev


The complex formation between the anionic chelate of molybdenum(VI) with the bidentate ligand of 3,5-dinitrocatechol (3,5-DNC) and its ion-association with the cation of 2,3,5-triphenyl-2Н-tetrazolium chloride (TTC) in the liquid-liquid extraction system Mo(VI)‒3,5-DNC‒TTC‒H2O‒CHCl3 were studied by spectrophotometry. The validity of Beer’s law was checked and some analytical characteristics of the system were calculated under the optimum conditions for the chelate formation and extraction. The effect of various co-existing ions and reagents on the process of chelate formation and ion-association was investigated. The molar ratio of the components in the ion-associated complex Mo(VI)–3,5-DNC–TTC was determined by independent methods. The association process in aqueous phase and the extraction equilibria were investigated and quantitatively characterized by the following equilibrium constants: association constant, distribution constant, extraction constant and recovery factor. Based on this, a reaction scheme, a general formula and a structural formula of the complex were suggested.


Molybdenum(VI); bidentate ligand; chelate formation; extraction equilibriums

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