1200 - 1240 Jeffrey R Long

Applications of Coordination Chemistry in the Synthesis of Single-Molecule Magnets

In an effort to produce new examples of single-molecule and single-chain magnets, we are exploring routes to mononuclear complexes with a large magnetic anisotropy and their incorporation into high-nuclearity metal-cyanide clusters. The use of multidentate capping ligands has led to the synthesis of a range of new cyano-bridged cluster geometries, wherein variation of the transition metal ions permits adjustment of the ground state spin and magnetic anisotropy. In particular, the incorporation of transition metal ions with a large unquenched orbital angular momentum is found to enhance magnetic relaxation barriers. Recent work involving the observation of slow magnetic relaxation in mononuclear iron and uranium complexes will also be presented,1,2 as will attempts to generate well-isolated high-spin ground states via electron delocalization in imidazolate-bridged clusters. 

References:

(1) Rinehart, J. D.; Long, J. R. J. Am. Chem. Soc. 2009, 131, 12558. 
(2) Freedman, D. E.; Harman, W. H.; Harris, T. D.; Long, G. J.; Chang, C. J.; Long, J. R. J. Am. Chem. Soc. 2010, 132, 1224.