Extraction-Spectrophotometric Studies on the Ion-Pairing Between Some 2,3,5-Substituted Monotetrazolium Cations and Anions Deriving from 4-(2-Thiazolylazo)resorcinol or 4-(2-Pyridylazo)resorcinol

Authors

  • Kiril Blazhev Gavazov University of Plovdiv "Paisii Hilendarski"
  • Galya K. Toncheva University of Plovdiv “Paisii Hilendarskii”, 24 Tsar Assen Street, 4000 Plovdiv

DOI:

https://doi.org/10.24297/jac.v5i2.2653

Keywords:

Tetrazolium salts, azo dyes, ion-association, liquid-liquid extraction, spectrophotometry

Abstract

The ion-pairing between some 2,3,5-substituted monotetrazolium cations (T+) and anions deriving from 4-(2-pyridylazo)resorcinol (PAR) or 4-(2-thiazolylazo)resorcinol (TAR) was studied by water-chloroform extraction and spectrophotometry. The following tetrazolium salts (TS) were used as a source of T+: i) 2,3,5-triphenyl-2H-tetrazolium chloride (TTC); ii) 3-(4,5-dimethyl-2-thiazol)-2,5-diphenyl-2H-tetrazolium bromide (MTT); iii) 3-(2-naphtyl)-2,5-diphenyl-2H-tetrazolium chloride (Tetrazolium violet, TV); and iv) 2-(4-iodophenyl)-3-(4-nitrophenyl)-5-phenyl-2H-tetrazolium chloride (INT). The spectral characteristics of the extracted species were established at different pH and TS concentration. The composition and stability of the ion-pairs were determined at pH 9, where the extraction of neutral PAR (H2PAR) and TAR (H2TAR) species was negligible. The results showed that the ion-pairs can be expressed with the following formulae (T+)(HTAR–) (where T+ = TT+, MTT+, TV+ or INT+), (T+)(HPAR–) (where T+ = TT+, MTT+ or TV+) and [(INT+)(HPAR–)]2. Relationships involving the molecular masses of the ion-pairs (MIP) or T+ (MT+) and the values of the constants of association (b) or conditional molar absorptivities (e’) were examined, namely Log b = f(Log MIP) and e’ = f(Log MT+). Some practical aspects concerning the investigation of metal complexes with TS-PAR/TS-TAR were discussed.

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Author Biographies

Kiril Blazhev Gavazov, University of Plovdiv "Paisii Hilendarski"

Department of General and Inorganic ChemistryAssoc. Prof. Head of Department

Galya K. Toncheva, University of Plovdiv “Paisii Hilendarskii”, 24 Tsar Assen Street, 4000 Plovdiv

Department of General and Inorganic Chemistry

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Published

2009-09-17

How to Cite

Gavazov, K. B., & Toncheva, G. K. (2009). Extraction-Spectrophotometric Studies on the Ion-Pairing Between Some 2,3,5-Substituted Monotetrazolium Cations and Anions Deriving from 4-(2-Thiazolylazo)resorcinol or 4-(2-Pyridylazo)resorcinol. JOURNAL OF ADVANCES IN CHEMISTRY, 5(2), 641–651. https://doi.org/10.24297/jac.v5i2.2653

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