19F NMR based pH probes: lanthanide(III) complexes with pH-sensitive chemical shifts

Alan M. Kenwright; Ilya Kuprov; Elena De Luca; David Parker; Shashi U. Pandya; P. Kanthi Senanayake; David G. Smith

doi:10.1039/B802838A

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¹⁹F NMR based pH probes: lanthanide(iii) complexes with pH-sensitive chemical shifts†

Alan M. Kenwright,^a Ilya Kuprov,^a Elena De Luca,^a David Parker,*^a Shashi U. Pandya,^a P. Kanthi Senanayake^a and David G. Smith^a

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* Corresponding authors

^a Department of Chemistry, Durham University, South Road, Durham, UK
E-mail: david.parker@durham.ac.uk

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; pK_a 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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Supplementary files

DFT calculations, calculated structures, relaxation analysis, synthesis and characterisation PDF (6029K)

Article information

DOI: https://doi.org/10.1039/B802838A
Article type: Communication
Submitted: 19 Feb 2008
Accepted: 19 Mar 2008
First published: 01 May 2008

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Chem. Commun., 2008, 2514-2516

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¹⁹F NMR based pH probes: lanthanide(III) complexes with pH-sensitive chemical shifts

A. M. Kenwright, I. Kuprov, E. De Luca, D. Parker, S. U. Pandya, P. K. Senanayake and D. G. Smith, Chem. Commun., 2008, 2514 DOI: 10.1039/B802838A

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