Ternary ion-association complexes of cobalt with 4-(2-pyridylazo)resorcinol and tetrazolium salts

Authors

  • Vanya Dimitrova Lekova University of Plovdiv, Faculty of Chemistry, 24 Tzar Assen St, 4000 Plovdiv +35932261420
  • Vidka Vasileva Divarova University of Plovdiv, Faculty of Chemistry
  • Petya Vasileva Racheva Medical University, Faculty of Farmacology, 15AVasil Aprilov Boulevard, 4002 Plovdiv
  • Kirila Trifonova Stojnova University of Plovdiv, Faculty of Chemistry
  • Atanas Nikolov Dimitrov University of Plovdiv, Faculty of Chemistry

Keywords:

Cobalt-PAR chelate, tetrazolium salts, ion-association complexes, spectrophotometry, extraction

Abstract

The formation of ternary ion-association complexes of Co(II) with 4-(2-pyridylazo)resorcinol (PAR) and tetrazolium salts (TS) – (3-(4,5-dimethylThiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) and 3-(2-naphtyl)-2,5-diphenyl-2H-tetrazolium chloride (TV) – wereinvestigatedwith the aid of the extraction-spectrophotometric method. The optimum conditions for the extraction of Co(II) were found. On the basis of the experimental data and their mathematical treatment the association process in aqueous phase and extraction process was investigated quantitatively. The molar ratios of the components in the associates weredetermined. The results show that the extracted species could be represented with the general formula (TS)[CoH(PAR)2]. The following key constants were calculated: association constant, distribution constant, extraction constant and recovery factor.The validity of Beer’s law was checked and some analytical characteristics were calculated.

Author Biographies

Vanya Dimitrova Lekova, University of Plovdiv, Faculty of Chemistry, 24 Tzar Assen St, 4000 Plovdiv +35932261420

Department of General and Inorganic Chemistry with Methodology of Chemistry Education

Associate Professor Ph.D

Vidka Vasileva Divarova, University of Plovdiv, Faculty of Chemistry

Department of General and Inorganic Chemistry with Methodology of Chemistry Education

Ph.D Student

Petya Vasileva Racheva, Medical University, Faculty of Farmacology, 15AVasil Aprilov Boulevard, 4002 Plovdiv

Department of Chemistry and Biochemistry

Assistant Professor Ph.D


Kirila Trifonova Stojnova, University of Plovdiv, Faculty of Chemistry

Department of General and Inorganic Chemistry with Methodology of Chemistry Education

Assistant Professor

Atanas Nikolov Dimitrov, University of Plovdiv, Faculty of Chemistry

Department of General and Inorganic Chemistry with Methodology of Chemistry Education

Associate Professor Ph.D

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Published

04.09.2014

Issue

Vol. 61 No. 4 (2014)

Section

Inorganic chemistry

License

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