Chemistry

Networked Polyhedra

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Science  31 Aug 2007:
Vol. 317, Issue 5842, pp. 1149
DOI: 10.1126/science.317.5842.1149a

One approach to engineering porous solids has focused on combining metallic and organic building blocks. Linking multiple organic ligands to metal-ion nodes can produce microporous three-dimensional networks. In an extension of this method, small bidentate ligands such as 1,3-benzenedicarboxylate (bdc) can bind to Cu2+ ions to form discrete polyhedra (rhombihexahedra) that in turn act as larger nodes for assembling expanded networks. Perry et al. now show that when two bdc units are bridged with a flexible aryloxy spacer group, self-assembly with Cu2+ ions leads to a covalently linked set of the polyhedral units, arranged together in an interpenetrating tetragonal net. Crystallography reveals that the ligands adopt two independent conformations, one syn and one anti, in different directions within the lattice. — PDS

J. Am. Chem. Soc. 129, 10076 (2007).

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