The formation constants for the complexes of Mg2+, Ca2+, Sr2+ and Ba2+ with 2,2'-bipyridyl and 1,10-phenanthroline have been determined from pH measurements in aqueous solution, at 10, 25 and 40° and various ionic strengths in the range 0.05-0.95M. The species [MtL)]2+ was found in all systems. The dependence on ionic strength was calculated for all the stability constants, and ΔH° values have been calculated from the temperature dependence of the stability constants. The formation constants are in the order MgL2+ > CaL2+ > SrL2+ > BaL2+ and M-10, 10-phenanthroline > M-2,2'-bipyridyl
Thermodynamics of Formation of Magnesium, Calcium, Strontium and Barium Complexes with 2,2'-Bipyridyl and 1,10-Phenanthroline, at Different Ionic Strengths in Aqueous Solution
DE ROBERTIS, Alessandro;DE STEFANO, Concetta;SCARCELLA, Rosario
1985-01-01
Abstract
The formation constants for the complexes of Mg2+, Ca2+, Sr2+ and Ba2+ with 2,2'-bipyridyl and 1,10-phenanthroline have been determined from pH measurements in aqueous solution, at 10, 25 and 40° and various ionic strengths in the range 0.05-0.95M. The species [MtL)]2+ was found in all systems. The dependence on ionic strength was calculated for all the stability constants, and ΔH° values have been calculated from the temperature dependence of the stability constants. The formation constants are in the order MgL2+ > CaL2+ > SrL2+ > BaL2+ and M-10, 10-phenanthroline > M-2,2'-bipyridylFile in questo prodotto:
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