Abstract
The ion-associated complex formed between anionic chelate of Co(II)-4-(2-Thiazolylazo)resorcinol (TAR) with the monotetrazolium cation of 2-(4-Iodophenyl)-3-(4-nitrophenyl)-5-phenyl-2H-tetrazolium chloride (INT) in the liquid-liquid extraction system Co(II)-TAR-INT-H(2)O-CHCl(3) was studied by the spectrophotometric method. The optimum extraction conditions of Co(II) were found. The extraction equilibria were studied. The equilibrium constants, the recovery factor and some analytical characteristics were calculated. The validity of Beer's law was checked. The molar ratio of the components in the ternary ion-associated complex Co(II)-TAR-INT was determined. The general formula of the complex was suggested. The effect of various foreign ions and reagents on the process of complex formation in the liquid-liquid extraction system was studied.
Highlights
The cobalt refers to the group of elements essential from biochemical point of view
Cobalt is a typical transition metal participating in complex formation
Tetrazolium salts are used as reagents for the extraction-spectrophotometric determination of metals, e.g. Mo(VI), W(VI), Ge(IV), Tl(III), Nb(V), V(IV), V(V), Ga(III).[20,21,22]
Summary
The cobalt refers to the group of elements essential from biochemical point of view. For example, one of compounds containing cobalt complexes is vitamin B12 which participates in the synthesis of the hemoglobin and affects the protein and lipid metabolism. The complexes of cobalt with chelate ligands, containing N and O donor atoms, have industrial, biological, pharmacological and medical applications.[5,6,7,8,9] The complex formation with azo derivatives of resorcinol via phenolic oxygen, azo nitrogen and thiazolyl or pyridylazo nitrogen, gives colored chelates with metal cations.[10,11,12,13,14,15,16,17,18,19] Tetrazolium salts are used as reagents for the extraction-spectrophotometric determination of metals, e.g. Mo(VI), W(VI), Ge(IV), Tl(III), Nb(V), V(IV), V(V), Ga(III).[20,21,22] The preparation and application of ion-associated complexes of anionic chelates of metals with various natural organic and inorganic ligands with N- and Ocontaining donor atoms and with the participation of mono and ditetrazolium cations is a special scientific research field of the chemistry of the coordination compounds. The overall purpose is an application of the system for determination of cobalt in alloys, biological, medical and pharmaceutical objects
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