Gavazov, Kiril BlazhevRacheva, Petya VasilevaLekova, Vanya DimitrovaDimitrov, Atanas NikolovTurkyilmaz, MuratGenc, Fatma2024-06-122024-06-1220120011-16431334-417Xhttps://doi.org/10.5562/cca1885https://hdl.handle.net/20.500.14551/24547Several 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 (beta) between MBT2+ and the anionic V-ADR chelates (Chel(n-)) were calculated. Previously reported negative linear relationship between log beta and the number of nitro groups included in tetrazolium cation (N-nitro) 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)en10.5562/cca1885info:eu-repo/semantics/openAccessVanadiumDitetrazolium SaltsAzocompoundsAssociation ConstantNitro GroupSolvent ExtractionSpectrophotometric DeterminationPotentiometric DeterminationTetrazolium VioletExtraction4-(2-Pyridylazo)Resorcinol4-(2-Thiazolylazo)ResorcinolParTetraphenylarsoniumChloroformElectrodeArticle8515358Q4WOS:0003047854000072-s2.0-84860809929Q4