A 2:2:2 Complex of Vanadium(V) with 4-(2-Thiazolylazo)orcinol and 2,3,5-Triphenyl-2H-Tetrazolium Chloride

Authors

  • Kiril Blazhev Gavazov Plovdiv University "Paisii Hilendarski"
  • Vassil Borisov Delchev Plovdiv University "Paisii Hilendarski"
  • Kremena Tomova Mileva Plovdiv University "Paisii Hilendarski"
  • Teodora Stefcheva Stefanova Plovdiv University "Paisii Hilendarski"
  • Galya Kostadinova Toncheva Plovdiv University "Paisii Hilendarski"

DOI:

https://doi.org/10.17344/acsi.2016.2431

Keywords:

liquid-liquid extraction, spectrophotometry, tetrazolium salt, 5-methyl-4-(2-thiazolylazo)resorcinol, 2, 2 complex, HF calculations

Abstract

The complex formation in the vanadium(V) / 4-(2-thiazolylazo)orcinol (TAO) / 2,3,5-triphenyl-2H-tetrazolium chloride (TTC) liquid-liquid extraction-chromogenic system was studied. The chloroform-extracted complex has a composition of 2:2:2 under the optimum conditions (pH 4.8–5.2, extraction time 3 min, concentration of TAO 3.4´10–4 mol dm–3, and concentration of TTC 9.4´10–4 mol dm–3) and could be regarded as a dimer (D) of two 1:1:1 species (S) presented by the formula (TT+)[VO2(TAO)]. The constant of extraction was calculated by two methods and some analytical characteristics were determined. The wavelength of maximum absorption (lmax), molar absorptivity (el) and fraction extracted (E) were found to be l = 545 nm, e545 = 1.97´104 dm3 mol–1 cm–1, and E = 97.9 %. The ground-state equilibrium geometries of the complexes S and D were optimized by quantum chemical Hartree-Fock calculations using 3-21G* basis functions. The bonding and interaction energies were calculated as well.

Author Biographies

Kiril Blazhev Gavazov, Plovdiv University "Paisii Hilendarski"

Department of General and Inorganic Chemistry, Assoc. Prof.

 

Vassil Borisov Delchev, Plovdiv University "Paisii Hilendarski"

Department of Physical Chemistry, Assoc. Prof.

Kremena Tomova Mileva, Plovdiv University "Paisii Hilendarski"

Department of Chemical Technology, MS student

Teodora Stefcheva Stefanova, Plovdiv University "Paisii Hilendarski"

Department of General and Inorganic Chemistry, Assoc. Prof.

Galya Kostadinova Toncheva, Plovdiv University "Paisii Hilendarski"

Department of General and Inorganic Chemistry, Chief Assist. Prof.

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Published

20.05.2016

Issue

Vol. 63 No. 2 (2016)

Section

Inorganic chemistry

License

Except where otherwise noted, articles in this journal are published under the Creative Commons Attribution 4.0 International License