Linker extensions in metal-organic frameworks: a way to isoreticular networks or new topologies

The synthesis of a new microporous metal-organic framework (UHM-7) under solvothermal conditions and its characterisation by single-crystal X-ray analysis and several physisorption measurements is presented. The MOF structure is composed of copper ions and a novel non-linear silicon containing tetracarboxylate linker and exhibits an unprecedented topology (chs-1). The surface area and the micropore volume were determined by nitrogen physisorption measurements to be 1290 m(2) g(-1) and 0.48 cm(3) g(-1), respectively. Furthermore, UHM-7 shows gas storage capacities of 1.5 wt% H-2 at 77 K, 0.5 mmol g(-1) CH4 at 298 K and 2.3 mmol g(-1) CO2 at 298 K.