Thermodynamics of complexation of magnesium and calcium ions with dichloromethylenediphosphonate.
Thermodynamic parameters for the complexation of CA(2+) and Mg(2+) ions by dichloromethylenediphosphonate (clodronate) ligand were obtained by potentiometric and calorimetric techniques. The measurements were conducted at an ionic strength of 0.10M [(CH(3))(4)NCl]) and at 25 degrees C. The potentiometric data were consistent with a model involving the presence of ML(2-)MHL(-) and M(2)L species (L = tetranegative clodronate anion). The enthalpies of formation of the ML(2-) and MHL(-) complexes were obtained from calorimetric data. Attempts to determine the enthalpies of formation of the M(2)L species were unsuccessful due to the limited solubilities of these species.
Kaila
L
L
Department of Chemistry, University of Oulu, SF 90570, Oulu, Finland.
Lajunen
L H
LH
Rizkalla
E N
EN
Eloranta
J
J