19F NMR based pH probes: lanthanide(III) complexes with pH-sensitive chemical shifts |
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| Authors: | Kenwright Alan M Kuprov Ilya De Luca Elena Parker David Pandya Shashi U Senanayake P Kanthi Smith David G |
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| Institution: | Department of Chemistry, Durham University, South Road, Durham, UKDH1 3LE. |
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| Abstract: | Experimental measurements and theoretical analysis of magnetic properties, structural dynamics and acid-base equilibria for several lanthanide(III) complexes with tetraazacyclododecane derivatives as 19F NMR chemical shift pH probes are presented; pKa values vary between 6.9 and 7.7, with 18 to 40 ppm chemical shift differences between the acidic and basic forms for Ho(III) complexes possessing T1 values of 10 to 30 ms (4.7-9.4 T, 295 K). |
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