A heterometallic microporous MOF exhibiting high hydrogen uptake

An unusual heterometallic microporous metal–organic framework Cu 3 Cr(TSTC) 2 (H 2 O) 4 · x G ( 1 ) (H 4 TSTC = trans- stilbene-3,3′,5,5′-tetracarboxylic acid; G = guest molecules) was solvothermally synthesized and characterized. The structural analysis reveals that compound 1 features a 3D distorted NbO-type network with high solvent-accessible volume of 68.5% assembled by two kinds of distinct cages. The adsorption measurements (77 K) results show that compound 1 has a BET surface area of 2485 m 2 /g, exhibits the great heat of hydrogen adsorption in the range of 7.0–8.4 kJ/mol and significantly higher H 2 hydrogen storage of 2.70 wt.% under 1 bar than those of IRMOF-1 (1.32 wt.%), MOF-177 (1.25 wt.%), UMCM-2 (1.40 wt.%), UMCM-150 (2.10 wt.%) and HKUST-1 (2.18 wt.%).