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Pure Appl. Chem. Vol. 73, No. 10, pp. 1641-1677 (2001)

Pure and Applied Chemistry

Vol. 73, Issue 10

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,,-tetrakis-(methylenephosphonic acid), and diethylenetriamine-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".

> Download full text of the report [pdf file - 354 KB]

>> Errata Pure Appl. Chem. 74(11), p. 2227, 2002

> View corresponding project

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