Ionic strength dependence of formation constants-V Protonation constants of some nitrogen-containing ligands at different temperatures and ionic strengths.
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.
Daniele
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PG
Istituto di Analisi Chimica Strumentale dell'Università, via Bidone 36, 10125 Torino, Italy.
Rigano
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Sammartano
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