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A three-dimensional microporous metal–organic framework assembled from a T-shaped pyridyl dicarboxylate ligand, 4′-(pyridin-4-yl)-[1,1′-biphenyl]-3,5-dicarboxylic acid (H2PBPD), has been successfully synthesized via solvothermal reaction with copper(II) nitrate. Compound 1 was characterized by X-ray single-crystal diffraction, elemental analysis, IR spectroscopy and thermogravimetric analyses. Single-crystal X-ray diffraction analysis indicates that compound 1 is a (3,6)-connected three-dimensional framework with the point symbol {42·6}2{44·62·86·103}. In the framework of this compound, there exist two large metal–ligand cages. Stability tests show that compound 1 keeps its crystal structure after being soaked in several organic solvents or calcined at 250 °C under air atmosphere. The N2 adsorption at 77 K shows that compound 1 is microporous with a BET surface area of 1682 m2 g−1. Compound 1 possesses high adsorption capacities for CO2 (114 cm3 g−1, 273 K) under ambient pressure. The test of CO2 cyclic adsorption and regeneration of 1 shows that it has a stable CO2 adsorption capacity and no obvious weight change after doing this ten times.

rsc advances

Synthesis, structure and gas adsorption properties of a stable microporous Cu-based metal–organic framework assembled from a T-shaped pyridyl dicarboxylate ligand