Original scientific paper

https://doi.org/10.5562/cca1885

Some Ternary Phenylmethoxybis(tetrazolium) Complexes of Vanadium(IV,V) and Their Constants of Association

Kiril Blazhev Gavazov orcid.org/0000-0002-1360-8977 ; Department of General and Inorganic Chemistry, University of Plovdiv “Paisii Hilendarski”, 24 Tsar Assen Str., 4000 Plovdiv, Bulgaria
Petya Vasileva Racheva ; Department of Chemistry and Biochemistry, Medical University Plovdiv, 15A Vassil Aprilov Blvd., 4002 Plovdiv, Bulgaria
Vanya Dimitrova Lekova ; Department of General and Inorganic Chemistry, University of Plovdiv “Paisii Hilendarski”, 24 Tsar Assen Str., 4000 Plovdiv, Bulgaria
Atanas Nikolov Dimitrov ; Department of General and Inorganic Chemistry, University of Plovdiv “Paisii Hilendarski”, 24 Tsar Assen Str., 4000 Plovdiv, Bulgaria
Murat Türkyilmaz ; Faculty of Science, Chemistry Department, University of Trakya, 22030 Edirne, Turkey
Fatma Genç ; Faculty of Science, Chemistry Department, University of Trakya, 22030 Edirne, Turkey

Abstract

Several liquid-liquid extraction systems containing vanadium {vanadium(IV) or vanadium(V)}, azoderivative of resorcinol {ADR: 4-(2-pyridylazo)-resorcinol (PAR) or 4-(2-thiazolylazo)-resorcinol (TAR)} and (phenylmethoxibis)tetrazolium salts {MBT: 3,3'-(3,3'-dimetoxy-4,4'-biphenylene)-bis(2,5-diphenyl-2H-tetrazolium) chloride (Blue Tetrazolium, BT) or 3,3'-(3,3'-dimetoxy-4,4'-biphenylene)-bis[2,5-di(4-nitrophenyl)-2H-tetrazolium] chloride (Tetranitroblue Tetrazolium, TNBT)} were studied. The optimum operating conditions and compositions of the extracted species were found. The constants of association (β) between MBT2+ and the anionic V–ADR chelates (Cheln–) were calculated. Previously re-ported negative linear relationship between log β and the number of nitro groups included in tetrazolium cation (Nnitro) was discussed taking into account the obtained results and literature data for V–ADR–MBT complexes of the same class, in which MBT is BT or 3,3'-(3,3'-dimetoxy-4,4'-biphenylene)bis[2-(4-nitrophenyl)-5-phenyl-2H-tetrazolium] chloride (Nitroblue Tetrazolium, NBT). (doi: 10.5562/cca1885)

Keywords

vanadium; ditetrazolium salts; azocompounds; association constant; nitro group; solvent extraction

Hrčak ID:

80412

URI

https://hrcak.srce.hr/80412

Publication date:

30.4.2012.

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