Department of Chemistry,

University of Durham

Alan M. Kenwright

Senior Research Officer - NMR

Telephone: 0191 334 2095 (direct)

E-mail: A.M.Kenwright@durham.ac.uk


Nuclear Magnetic Resonance (NMR)

Solution-state NMR is one of the most useful techniques for characterising the chemical nature of substances which can be dissolved. The nuclei of certain isotopes possess spin angular momentum ("spin") and the interaction of this spin with radio frequency radiation in the presence of a magnetic field provides a probe which is uniquely sensitive to the chemical environment of the nucleus. Information can be obtained not only about the chemical environment of the various nuclei present, but also about their connectivity and topology.
Typical uses of solution-state NMR range from quantitative fingerprinting of complex mixtures through confirmation of product structure with identification of residual solvents and other impurities, to full structural elucidation of unknowns. It is also very useful for the study of synthetic polymers where it probes not only chemical composition but also chain microstructure.
The Analytical Centre in the Chemistry Department at Durham University is extremely well equipped for solution-state NMR investigations, having six spectrometers housed in a purpose-built suite of laboratories. The six spectrometers operate at a range of magnetic field strengths corresponding to proton resonance frequencies of 200, 300, 400 (x2), and 500 (x2) MHz. (Increased magnetic field strength gives greater resolution and greater sensitivity.)

Research Interests

My research interests centre on the application of NMR techniques to a wide range of chemical problems, with particular interest in the NMR of polymers. A list of recent research articles is given below. Although primarily involved in solution-state NMR, I also maintain an active interest in solid-state NMR, and in particular in broad-line proton studies of polymers, as shown in this electronic poster.

Recent Publications

“Synthesis and luminescence properties of a kinetically stable dinuclear ytterbium complex with differentiated binding sites”
S. J. A. Pope, A. M. Kenwright, S. L. Heath, S. Faulkner
Chemical Communications, 1550, (2003)

“Synthesis and luminescence properties of dinuclear lanthanide complexes derived from covalently linked macrocyclic ligands”
S. J. A. Pope, A. M. Kenwright, V. A. Boote, S. Faulkner
Dalton Transactions, 3780, (2003)

 “NMR measurements of diffusion in concentrated samples: avoiding problems with radiation damping”
M. A. Connell, A. L. Davis, A. M. Kenwright, G. A. Morris
Analytical and Bioanalytical Chemistry, 378, 1568, (2004)

“2D and 3D DOSY Methods for Studying Mixtures of Oligomeric Dimethylsiloxanes”
M. J. Stchedroff, A. M. Kenwright , G. A. Morris , M. Nilsson, R. K. Harris
Physical Chemistry and Chemical Physics, 6, 3221, (2004)

 “Ring opening metathesis polymerisations of norbornene and norbornadiene derivatives containing oxygen: a study on the regeneration of Grubbs catalyst”
D. M. Haigh, A. M. Kenwright and E. Khosravi
Tetrahedron, 60, 7217, (2004)

 


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This page last modified May 18th, 2005 by Alan Kenwright