A heterometallic microporous MOF exhibiting high hydrogen uptake

An unusual heterometallic microporous metal–organic framework Cu3Cr(TSTC)2(H2O)4·xG (1) (H4TSTC = 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 m2/g, exhibits the great heat of hydrogen adsorption in the range of 7.0–8.4 kJ/mol and significantly higher H2 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.%).

A heterometallic microporous MOF with high solvent-accessible volume of 68.5% was assembled by two kinds of distinct cages. H2 adsorption measurements reveal that this MOF exhibits significantly high H2 hydrogen storage of 2.70 wt.% at 77 K under 1 bar, which is determined by the greater heat of hydrogen adsorption in the range of 7.0–8.4 kJ/mol.Figure optionsDownload as PowerPoint slideHighlights
► A rare heterometallic porous MOF (1) with distorted NbO-type network was prepared.
► Compound 1 shows a high solvent-accessible volume of 68.5%.
► 1 Exhibits significantly high H2 hydrogen uptake of 2.70 wt.% at 77 K under 1 bar.
► A greater heat of H2 adsorption for 1 in the range of 7.0–8.4 kJ/mol was recorded.