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


Critical evaluation of stability constants of phosphonic acids (IUPAC Technical Report)

Konstantin Popov1, Hannu Rönkkömäki2 and Lauri H. J. Lajunen2

1 Institute 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
2 Department 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".

Errata to this article were published in:
Pure Appl. Chem., 2002, Vol. 74, No. 11, pp. 2227