Deuteron NMR of a manganese-ion cluster nanomagnet
J. Stefan Institute, University of Ljubljana - Ljubljana, Slovenia
2 Laboratorium für Festkörperphysik, ETH Hönggerberg - Zürich, Switzerland
3 Department of Chemistry and National High Magnetic Field Laboratory, Florida State University - Tallahassee, FL 32306-4390, USA
Accepted: 27 April 1998
The temperature dependence of deuteron NMR spectra of the fully deuterated manganese ion cluster nanomagnet -acetate has been measured. Two sets of deuteron peaks have been observed which both shift towards lower fields with decreasing temperature. The strongly shifted peak is associated with the deuterons of the four molecules which are directly attached to the Mn core. The less shifted peak is due to the deuterons, which are three bonds away from the oxygen that is attached to Mn ions, as well as to the solvated and molecules. The results imply that the unpaired spin density extends over the whole molecular cluster rather than being concentrated at the Mn ions.
PACS: 75.45.+j – Macroscopic quantum phenomena in magnetic systems / 75.50.Tt – Fine-particle systems / 76.60.Cq – Chemical and Knight shifts
© EDP Sciences, 1998