title: Ionic strength dependence of formation constants-V Protonation constants of some nitrogen-containing ligands at different temperatures and ionic strengths.
abstract: The protonation constants of 2,2'-bipyridyl, 1,10-phenanthroline, 1,3-diaminopropane, l-histidine and histamine have been determined potentiometrically, in the temperature range 10-40 degrees and at ionic strengths ranging from 0.04 to 1 (potassium chloride). The dependence of the protonation constants on ionic strength is described by a simple general equation. The enthalpy changes for the protonation of the ligands have been calculated from the temperature dependence of the protonation constants.
authors.affiliation: Istituto di Analisi Chimica Strumentale dell'Università, via Bidone 36, 10125 Torino, Italy.
authors.forename: P G
authors.initials: PG
authors.lastname: Daniele
authors.forename: C
authors.initials: C
authors.lastname: Rigano
authors.forename: S
authors.initials: S
authors.lastname: Sammartano