Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 47, Pages 21203-21209Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202007856
Keywords
cobalt; electron density; magnetic properties; single-molecule studies; X-ray diffraction
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Funding
- VILLUM FONDEN [12391]
- Danish National Research Foundation [DNRF-93]
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Reported here is an entirely new application of experimental electron density (EED) in the study of magnetic anisotropy of single-molecule magnets (SMMs). Among those SMMs based on one single transition metal, tetrahedral Co-II-complexes are prominent, and their large zero-field splitting arises exclusively from coupling between the dx2-y2and d(xy)orbitals. Using very low temperature single-crystal synchrotron X-ray diffraction data, an accurate electron density (ED) was obtained for a prototypical SMM, and the experimental d-orbital populations were used to quantify the d(xy)-dx2-y2coupling, which simultaneously provides the composition of the ground-state Kramers doublet wave function. Based on this experimentally determined wave function, an energy barrier for magnetic relaxation in the range 193-268 cm(-1)was calculated, and is in full accordance with the previously published value of 230 cm(-1)obtained from near-infrared spectroscopy. These results provide the first clear and direct link between ED and molecular magnetic properties.
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