Conductometric determination of formation constants of tris(2-pyridyl)methylamine and titanium (III) in water-acetonitryl mixture.

• Main Authors: Rezayi, Majid, Kassim, Anuar, Ahmadzadeh, Saeid, Yusof, Nor Azah, Naji, Abolfazl, Ahangar, Hossein Abbastabar
• Format: Article
• Language: English; English
• Published: Electrochemical Science Group 2011
• Online Access: http://psasir.upm.edu.my/id/eprint/24765/1/Conductometric%20determination%20of%20formation%20constants%20of%20tris.pdf; http://psasir.upm.edu.my/id/eprint/24765/; http://www.electrochemsci.org/

A conductance study of the interaction between titanium (III) cation and tris(2-pyridyl) methylamine (tpm), in water-acetonitrile mixtures was carried out at various temperatures. The formation constants of the resulting 1:1 complexes were determined from the molar conductance-mole ratio data. The stability constants of 1:1 (M:L) complexes of tpm with titanium (III) cation, the Gibbs standard free energies (ΔGc o{script}), the standard enthalpy changes (ΔHc o{script}) and the standard entropy changes (ΔSc o{script}) for the formation of these complexes in acetonitrile-water (AN-H2O) binary mixtures have been determined conductometrically. The stability constants of the complexes were obtained from fitting of molar conductivity curves using a computer program, GENPLOT.