Lanthanide single-molecule magnets containing a N23- radical-bridge exhibit remarkable blocking temperatures as a result of extraordinary strong exchange coupling.1 This finding hinted at the promise of lanthanides strongly coupled to radical species for high magnetic blocking temperatures. Since the realization of potential applications of single-molecule magnets hinges on even higher blocking temperatures, we explored various organic radical-briged dilanthanide complexes by ac and dc magnetic susceptibiliy analysis involving SQUID magnetometry. Notably, a bipyrimidyl radical-bridge was discovered to induce strong exchange coupling in dilanthanide compounds that gave rise to both slow magnetic relaxation and magnetic blocking.2 In pursuit of a deeper understanding of the origins of the strong exchange coupling and the spin reversal barriers, we probed lanthanide compounds incorporating different radicals. This study, in conjunction with other work from our group, will be discussed. References: (1) (a) Rinehart, J. D.; Fang, M.; Evans, W. J.; Long, J. R. Nat. Chem. 2011 , 3, 538. (b) Rinehart, J. D.; Fang, M.; Evans, W. J.; Long, J. R. J. Am. Chem. Soc. 2011 , 133, 14236. (2) Demir, S.; Zadrozny, J. M.; Nippe, M.; Long, J. R. J. Am. Chem. Soc. 2012 , 134, 18546.

Radical-bridged lanthanide single-molecule magnets

248th National Meeting (2014)

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