Some ternary phenylmethoxybis(tetrazolium) complexes of vanadium(IV,V) and their constants of association

Gavazov K. B., Racheva P. V., Lekova V. D., Dimitrov A. N., TÜRKYILMAZ M., Genç F.

Croatica Chemica Acta, vol.85, no.1, pp.53-58, 2012 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 85 Issue: 1
  • Publication Date: 2012
  • Doi Number: 10.5562/cca1885
  • Journal Name: Croatica Chemica Acta
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.53-58
  • Keywords: Association constant, Azocompounds, Ditetrazolium salts, Nitro group, Solvent extraction, Vanadium
  • İstanbul Yeni Yüzyıl University Affiliated: No

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 MBT 2+ and the anionic V-ADR chelates (Chel n-) were calculated. Previously reported negative linear relationship between log β 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).