Metal−Organic Frameworks Based on Double-Bond-Coupled Di-Isophthalate Linkers with High Hydrogen and Methane Uptakes

By Xi-Sen Wang, Shengqian Ma, K. Rauch, J. Simmons, Daqiang Yuan, Xiaoping Wang, T. Yildirim, W. Cole, Joseph J. López, A. Meijere and 1 more. 2008

242 citations recorded by the source corpus.

Solvothermal reactions of Cu(NO3)2 with azoxybenzene-3,3′,5,5′-tetracarboxylic acid (H4aobtc) or trans-stilbene-3,3′,5,5′-tetracarboxylic acid (H4sbtc) give rise to two isostructural microporous metal−organic frameworks, Cu2(abtc)(H2O)2·3DMA (PCN-10, abtc = azobenzene-3,3′,5,5′-tetracarboxylate) and Cu2(sbtc)(H2O)2·3DMA (PCN-11, sbtc = trans-stilbene-3,3′,5,5′-tetracarboxylate), respectively. Both PCN-10 and PCN-11 possess significant enduring porosity with Langmuir surface areas of 1779 and 2442 m2/g (corresponding to BET surface areas of 1407 or 1931 m2/g, respectively) and contain nanoscopic cages and coordinatively unsaturated metal centers. At 77 K, 760 Torr, the excess gravimetric (volumetric) hydrogen uptake of PCN-10 is 2.34 wt % (18.0 g/L) and that of PCN-11 can reach 2.55 wt % (19.1 g/L). Gas-adsorption studies also suggest that MOFs containing C═C double bonds are more favorable than those with N═N double bond in retaining enduring porosity after thermal activation, although N═N has slightly hi...

Subfields: Inorganic Chemistry, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/4d95d2896f4bc6b0bdc759da694da910906abefb