The Interaction Between Sulfathiazole And Cobalt(Ii): Potentiometric Studies

S. BELLÚ; M. RIZZOTTO; N. B. OKULIK; A. H. JUBERT

QUíMICA NOVA

SOC BRASILEIRA QUIMICA

Lugar: San Pablo; Año: 2007 vol. 30 p. 1136 - 1142

0100-4042

Potentiometric studies of sulfathiazole (HST) in the presence and absence of cobalt(II) were performed. Equilibrium constants for the formation of the detected species, [Co(ST)]+ and [Co(ST)(OH)], are reported. UV-Vis spectrophotometric measurements suggest that the coordination Co(II)-sulfathiazole might be through a N atom, which, in agreement with MO calculations, could be a thiazolic one. In spite of sulfonamides being better ligands at pH >7, [Co(ST)]+ was found at pH = 3.