A Fivefold Path

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Science  30 Mar 2001:
Vol. 291, Issue 5513, pp. 2517
DOI: 10.1126/science.291.5513.2517a

Lanthanides tend toward large coordination spheres that can accommodate eight or nine ligands, yet framework compounds based on lanthanides usually show three- and fourfold connectivity between atoms; this is more commonly seen with transition metals that prefer to have smaller coordination spheres. Long et al. have pursued a strategy in which noncoordinating anions are used to open up spaces in frameworks and to avoid interpenetrating network formation. In the process, they have created structures with a rarely seen fivefold connectivity of the lanthanide ions, in this case through bridging 4,4'-bipyridine-N,N'-dioxide ligands. — PDS

J. Am. Chem. Soc., in press.

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