title: Thermodynamics of complexation of magnesium and calcium ions with dichloromethylenediphosphonate.
abstract: 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.
authors.affiliation: Department of Chemistry, University of Oulu, SF 90570, Oulu, Finland.
authors.forename: L
authors.initials: L
authors.lastname: Kaila
authors.forename: L H
authors.initials: LH
authors.lastname: Lajunen
authors.forename: E N
authors.initials: EN
authors.lastname: Rizkalla
authors.forename: J
authors.initials: J
authors.lastname: Eloranta