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

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

Chem Commun (Camb). 2008 Jun 14:(22):2514-6. doi: 10.1039/b802838a. Epub 2008 May 1.

Authors

Alan M Kenwright¹, Ilya Kuprov, Elena De Luca, David Parker, Shashi U Pandya, P Kanthi Senanayake, David G Smith

Affiliation

¹ Department of Chemistry, Durham University, South Road, Durham, UKDH1 3LE.

PMID: 18506228
DOI: 10.1039/b802838a

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).

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Algorithms
Cyclams
Fluorine / chemistry*
Heterocyclic Compounds / chemistry
Hydrocarbons, Fluorinated / chemical synthesis
Hydrocarbons, Fluorinated / chemistry*
Hydrogen-Ion Concentration
Indicators and Reagents / chemical synthesis
Indicators and Reagents / chemistry
Lanthanoid Series Elements / chemistry*
Magnetic Resonance Spectroscopy*
Models, Chemical
Molecular Structure
Water / chemistry

Substances

Cyclams
Heterocyclic Compounds
Hydrocarbons, Fluorinated
Indicators and Reagents
Lanthanoid Series Elements
Water
Fluorine
cyclen