ANALYTICAL
CHEMISTRY DIVISION
COMMISSION ON EQUILIBRIUM ATA
Critical evaluation of stability constants of phosphonic acids (IUPAC
Technical Report)
Konstantin Popov1,
Hannu Rönkkömäki2, and Lauri H. J. Lajunen2
1Institute of Reagents & High Purity Substances
(IREA), Bogorodsky val-3, 107258, Moscow, Russia and Moscow State University
of Food Technologies, Volokolamskoye Sh. 11, 125080 Moscow, Russia;
2Department of Chemistry, University of Oulu, P.O. Box 3000, FIN-90014
University of Oulu, Oulu, Finland
Abstract: Available experimental data on stability constants
of proton and metal complexes for 10 phosphonic acids [methylphosphonic
acid, 1-hydroxyethane-1,1-diylbisphosphonic acid, dichloromethylenebisphosphonic
acid, amino-methanephosphonic acid, N-(phosphonomethyl)glycine,
imino-N,N-bis(methylenephosphonic acid), N-methylamino-N,N-bis(methylenephosphonic
acid), nitrilotris(methylenephosphonic acid), 1,2-diaminoethane-N,N,N´,N´-tetrakis-(methylenephosphonic
acid), and diethylenetriamine-N,N,N´,N´´,N´´-pentakis-(methylenephosphonic
acid)], published in 19501997, have been critically evaluated.
For the latter phosphonate, all the data are rejected, as well as protonation
constants [HL]/[H][L] for three other ligands. Higher-quality data are
selected and presented as "Recommended" and "Provisional".
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>> Errata Pure Appl.
Chem. 74(11),
p. 2227, 2002
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