Record number :
Title of article :
Challenges in modelling and optimisation of stability constants in the study of metal complexes with monoprotonated ligands: Part I. A glass electrode potentiometric and polarographic study of a Cu–TAPSO–OH system Original Research Article
Author/Authors :
C.M.M Machado، نويسنده , , I Cukrowski، نويسنده , , P Gameiro، نويسنده , , H.M.V.M Soares، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
Pages :
From page :
To page :
Abstract :
The behaviour of solutions containing 3-(N-tris[hydroxymethyl]methylamine)-2-hydroxypropanesulfonic acid (TAPSO) and copper(II) was studied by two analytical techniques, direct current polarography (DCP) and glass electrode potentiometry (GEP), at fixed total TAPSO to total copper(II) concentration ratios and various pH values, at 25 °C and ionic strength 0.1 M KNO3. DCP and GEP, when used independently, were not able to provide a final metal–ligand model. Combined interpretation of data from DCP and GEP indicated the formation of six main species, CuL+, CuL(OH), CuL(OH)2−, CuL2, CuL2(OH)− and CuL2(OH)22− for which stability constants (as log β) were found to be 4.41, 11.43, 17.55, 8.08, 14.3 and 20.3, respectively. Five of these complexes, CuL(OH), CuL(OH)2−, CuL2, CuL2(OH)− and CuL2 (OH)22− are reported for the first time.
Keywords :
Biological buffers , copper , DC polarography , Potentiometry , TAPSO , Stability constants
Journal title :
Analytica Chimica Acta
Serial Year :
Link To Document :