Extractive-spectrophotometnc investigations on ternary ion-associated complexes between the vanadium(V) - 4-(2-pyridylazo)-resorcinol anionic chelate and some methoxybis(tetrazolium) cations
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Date
2008
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Abstract
The formation and liquid-liquid extraction of ion-associated complexes between the vanadium(V) - 4-(2-pyridylazo)-resorcinol (PAR) anionic chelate and the cations of some methoxybis(tetrazolium) salts (MT2+), which contain different number of nitro groups {3,3>-(3,3'-dimethoxy-4,4'- biphenylene)bis[2,5-di(4-nitrophenyl)-2H-tetrazolium] chloride (Tetranitrotetrazolium Blue chloride, TNBT), 3,3'-(3,3'-dimethoxy-4,4'- biphenylene)bis[2-(4-nitrophenyl)-5-phenyl-2H-tetrazolium] chloride (Nitro Blue Tetrazolium chloride, NBT) and 3,3'-(3,3>-dimethoxy-4>4'-biphenylene)- bis(2,5-diphenyl-2H-tetrazolium) chloride (Tetrazolium Blue chloride, BTC)} have been studied. The optimal conditions for extraction in chloroform (pH, concentrations of the reagents, extraction time) and the composition of the complexes (V:PAR:MT=2:4:3) have been found. The equilibrium constants (the constants of extraction - KEx, the constants of distribution- KD, the constants of formation- P), and the recovery factors have been determined. The results show that a linear relationship exists between LogKnx and the number of nitro groups included in MT2+ (NNo2): the higher N No2. the lower LogKEx- A similar relationship has been established between Log? and NNO2- These relationships have been used to predict the values of LogKEx and Log? for new (uninvestigated) methoxybis(tetrazolium) ion-associated complexes. © 2008 Bulgarian Academy of Sciences, Union of Chemists in Bulgaria.
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Keywords
4-(2-Pyridylazo)-Resorcinol; Extraction; Ion-Association; Nitro Group; Tetrazolium Salt; Vanadium
Journal or Series
Bulgarian Chemical Communications
WoS Q Value
Scopus Q Value
Q4
Volume
40
Issue
1
