Abstract
The complex formed between an anionic chelate of Mo(VI)-3,5-dinitrocatechol (3,5-DNC) with the cation of 3,3'-(3,3'-dimethoxy-4,4'-biphenylene)bis(2,5-diphenyl-2H-tetrazolium chloride) (Blue Tetrazolium Chloride, BTC) in the liquid-liquid extraction system Mo(VI)-3,5-DNC-BTC-H2O-CHCl3 was studied. The optimum conditions for the complex formation and extraction of the ion-associated complex were established by spectrophotometry. The molar ratio of the reagents was determined by independent methods. The validity of Beer's law was checked and some analytical characteristics were calculated. The association process in aqueous phase and the extraction equilibria were investigated and quantitatively characterized. The following key constants of the processes were calculated: association constant, distribution constant, extraction constant and recovery factor. Based on this, a reaction scheme, a general formula and a structure of the complex were suggested.
Highlights
The molybdenum is the only second row transition metal essential from biochemical point of view
The colored anionic chelate of molybdenum (VI)–3,5-DNC was extracted in chloroform in the presence of the bulky hydrophobic ditetrazolium cation
The acidity of the aqueous phase has a substantial effect on the extraction equilibrium
Summary
The molybdenum is the only second row transition metal essential from biochemical point of view. It stimulates the synthesis of nucleic acids and proteins. The most important utilization of the molybdenum atom in the living organisms is as a metal hetero-atom at the active site in certain enzymes, e.g. xanthine oxidase, aldehyde oxidase, sulfite oxidase, nitrate reductase, dimethyl sulfoxide reductase.[1,2,3,4]. The molybdenum occurs in various oxidation states, coordination numbers, geometries and its chemistry is among the most complex of the transition elements.[1,5,6] Molybdenum(VI) forms complexes with various natural organic ligands, such as polyphenols and their functional derivatives, polyhydroxycarboxylic acids, aminopolycarboxylic acids, hydroxamic acids, amines (primary, secondary and tertiaty), 8-hydroxyquinoline and its derivatives, aldehyde hydrazones, oximes, β-diketones, fluorones, hydroxyazodyes, biomolecules (chitosan, chitin, D-glucosamine, L-alanine, L-phenylalanine).[7,8,9,10,11,12,13,14,15,16]
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