Chatelain, LucileWalsh, James P. S.Pecaut, JacquesTuna, FlorianaMazzanti, Marinella2014-12-302014-12-302014-12-30201410.1002/anie.201407334https://infoscience.epfl.ch/handle/20.500.14299/109616WOS:000345590300019Mixed-metal uranium compounds are very attractive candidates in the design of single-molecule magnets (SMMs), but only one 3d-5f hetero-polymetallic SMM containing a uranium center is known. Herein, we report two trimeric heterodimetallic 3d-5f complexes self-assembled by cation-cation interactions between a uranyl(V) complex and a TPA-capped M-II complex (M=Mn (1), Cd (2); TPA = tris(2-pyridylmethyl) amine). The metal centers were strategically chosen to promote the formation of discrete molecules rather than extended chains. Compound 1, which contains an almost linear {Mn-O=U=O-Mn} core, exhibits SMM behavior with a relaxation barrier of 81 +/- 0.5 K-the highest reported for a mono-uranium system-arising from intra-molecular Mn-U exchange interactions combined with the high Ising anisotropy of the uranyl(V) moiety. Compound 1 also exhibits an open magnetic hysteresis loop at temperatures less than 3 K, with a significant coercive field of 1.9 T at 1.8 K.exchange interactionsmagnetismpolymetallic complexessingle-molecule magnetsuraniumtext::journal::journal article::research article