Achieving an Open Weave

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Science  19 May 2000:
Vol. 288, Issue 5469, pp. 1139
DOI: 10.1126/science.288.5469.1139c

If an inorganic or metal-organic framework has a sufficiently large lattice, interpenetrating networks can form in which the atoms and bonds of one lattice are woven through the other in a regular fashion. When such structures form, there typically is little space remaining.

Reineke et al. report that the condensation of Tb(III) ions with a long dicarboxylate linker in the presence of dimethylsulfoxide (DMSO) yields an interpenetrating network with a large free volume (71%) that is occupied by unincorporated and exchangeable DMSO guest molecules. The authors suggest that this porosity arises from the ratio of the length of the linkers to the size of the complexes that link them together; in fact, these compounds just miss forming a triple interpenetrating network.—PDS

J. Am. Chem. Soc.,122, 4843-4844 (2000).

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