Metal-organic frameworks (MOFs) composed of (triptycenedicarboxylato)zinc

Two novel 2D and 3D coordination polymers of 9,10-triptycenedicarboxylic acid and zinc nitrate, which form under solvothermal reaction conditions, are described. As determined by single-crystal X-ray structure analysis, their frameworks are assembled from dinuclear zinc coordination units which are interlinked by triptycenedicarboxylato (TDC) struts. In the 2D-MOF reported here, the extended network of van der Waals interactions between triptycene units as well as coordinated solvent molecules is responsible for the dense assembly of layers with a 4(4) net topology into the final crystal structure. The framework of the 3D-MOF is composed from [Zn(2)(TDC)1.5](infinity) layers with a 6(3) topology, the layers being interlinked by triptycenedicarboxylato pillars (bnn-net). This MOF possesses hexagonal channels which are filled with guest molecules. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008).