Complexation of the [Rh(H2O)6]3+ ion with phosphoric acid as probed by 31P NMR View Full Text


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Article Info

DATE

2014-05

AUTHORS

A. V. Belyaev, S. N. Vorob’eva, M. A. Fedotov, N. B. Kompan’kov

ABSTRACT

The kinetics of the reaction [Rh(H2O)6]3+ + H3PO4 ↔ [Rh(H2O)5H2PO4]2+ + H3O+ has been studied by 31P NMR; Ea = 142 ± 12 kJ/mol, logA = 17 ± 2. An empirical dependence of the 31P NMR chemical shift on the equilibrium pH value has been found. The acid dissociation constant of the coordinated ion has been evaluated: pK = 1.5. The 31P NMR chemical shifts of individual [Rh(H2O)5H2PO4]2+ and [Rh(H2O)5HPO4]+ complex ions are, respectively, 14.5 and 15.8 ppm at 323 K. More... »

PAGES

503-507

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s0036023614050027

DOI

http://dx.doi.org/10.1134/s0036023614050027

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1010454470


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