The remarkable pH dependence of the chemical shift separation (7.0 ± 0.1 ppm/pH unit) observed between the outer 1H NMR resonances on the spectrum of the paramagnetic complex [Yb(dotp)]5–[H8dotp = 1,4,7,10-tetraazacyclododecane-N,N′,N″,N″-tetrakis-(methylenephosphonic acid)] in the pH range 5.0–7.5 at 39°C enables this compound to be considered as a potential NMR probe for in vivo pH measurements.
S. Aime, M. Botta, L. Milone and E. Terreno, Chem. Commun., 1996, 1265 DOI: 10.1039/CC9960001265
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