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A Highly Porous and Robust (3,3,4)-Connected Metal–Organic Framework Assembled with a 90° Bridging-Angle Embedded Octacarboxylate Ligand


  • This work was supported by the U.S. Department of Energy (DOE DE-SC0001015, DE-FC36-07GO17033, and DE-AR0000073), the National Science Foundation (NSF CBET-0930079 and CHE-0911207), and the Welch Foundation (A-1725) supported this work. The microcrystal diffraction of PCN-80 was carried out with the assistance of Yu-Sheng Chen at the Advanced Photon Source on beamline 15ID-B at ChemMatCARS Sector 15, which is principally supported by the NSF/DOE under grant number CHE-0535644. Use of the Advanced Photon Source was supported by the U. S. DOE, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.


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Picky cage: A dicopper(II)-paddle-wheel-based metal–organic framework (PCN-80, see picture) with a rare (3,3,4)-connected topology has been synthesized by using a unique octatopic ligand featuring 90° bridging-angle dicarboxylate moieties. PCN-80 has Brunauer-Emmett-Teller (BET) and Langmuir surface areas of 3850 and 4150 m2 g−1, respectively. It exhibits high gas-uptake capacity for H2 and large adsorption selectivity of CO2 over N2.

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