Syntheses, structures and sorption properties of two framework-isomeric porous copper-coordination polymersElectronic supplementary information (ESI) available: TGA curves, PXRD, N2, CO2and methanol sorption isotherms of MCF-21′, additional structural plot. CCDC reference numbers 688066 and 688067. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/b813226g

Solvothermal and solution reactions of a V-shaped organic ligand 4,4′-oxybis(benzoic acid) (H2oba) and Cu(NO3)2yield two porous coordination polymers, namely [Cu(oba)(dmso)] (MCF-21) and [Cu2(oba)2(dmf)(C2H5OH)]·(dmf)2(H2O) (MCF-22·guest) (dmso = dimethyl sulfoxide, dmf = dimethylformamide), respectively. Single-crystal X-ray analyses reveal that the metal carboxylate backbones of MCF-21and MCF-22·guestare framework-isomeric as two uninodal four-connected nets, i.e.a two-dimensional (2-D) 44layer and a 3-fold interpenetrated lvt (4284) three-dimensional (3-D) network, respectively. After removing the solvent molecules, MCF-21retains a rigid 2-D framework, but MCF-22·guestexhibits either rigid or dynamic behavior depending on the degree of desolvation, which is confirmed by powder X-ray diffraction and sorption isotherms. Meanwhile, the different sorption behavior of the framework-isomeric materials is elucidated by the discrepancies of their pore dimensions and framework rigidities. [ABSTRACT FROM AUTHOR]