Study of the Step Wise Complexation Processes of Rhenium (V) and 2-Mercapto Pyridine in 6 Moles/L Hbr

*A. E. Okoronkwo and **A. A. Aminjanov

¹Department of Chemistry, Federal University of Technology Akure (Nigeria) ²Chemistry Department, Tajik State National University, Dushanbe 25 (Tajikistan C.I.S.)

The process of complex formation of Oxo penta Bromo Rhenate (V) ions and 2-mercapto pyridine was investigated potentiometrically by evaluating the formation equilibrium stability constants of the metal complex [ReOLNBr5-N]-N+2 at temperature range of 273-338K. These formation constants are used to derive the proportions of the various complex forms as a function of equilibrium ligand concentration. It was identified that for the temperature range of 273-328K there are 5 complex forms and at 338k, there are only 4 complex forms. Thermodynamic values for these complex forms were determined from the formation constants.

2-Mercapto pyridine; Rhenium (V); Formation Function; Stability constant