An unprecedented twofold interpenetrating (3,4)-connected 3-D metal–organic frameworkElectronic supplementary information (ESI) available: Synthesis of ligand and MOF, simplified view of network, crystal information, hydrogen-bonding table, and XRD pattern. See DOI: 10.1039/b702216f

An unprecedented twofold interpenetrating (3,4)-connected topology of the Cu3L4-type metal–organic framework was prepared using N,N′,N″-tris(4-pyridinyl)-1,3,5-benzenetricarboxamide (L) as a trigonal three-connection node and the copper(ii) ion as a square planar four-connection node, where the framework contains remarkably large 1-D solvent channels. [ABSTRACT FROM AUTHOR]