The pKa values of cis-[PtCl(H2O)(NH3)2]+(6.41) and cis-[Pt(H2O)2(NH3)2]2+(5.37 and 7.21) have been determined at 300 K via the use of 15N-edited 1H NMR spectroscopy and [1H, 15N] heteronuclear multiple quantum coherence spectroscopy; this allows rapid measurements at low (millimolar) concentrations, and so avoids some of the problems associated with other methods.
S. J. Berners-Price, T. A. Frenkiel, U. Frey, J. D. Ranford and P. J. Sadler, J. Chem. Soc., Chem. Commun., 1992, 789 DOI: 10.1039/C39920000789
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