Gaining Insights on the H2-Sorbent Interactions: Robust soc-MOF Platform as a Case Study.

Cairns AJ, Eckert J, Wojtas L, Thommes M, Wallacher D, Georgiev PA, Forster PM, Belmabkhout Y, Ollivier J, Eddaoudi M (2016)

Publication Type: Journal article, Original article

Subtype: other

Publication year: 2016


Publisher: American Chemical Society

Book Volume: 28

Pages Range: 7353-7361-7361

Journal Issue: 20

DOI: 10.1021/acs.chemmater.6b02817


We report on the synthesis and gas adsorption properties (i.e., Ar and H2) of four robust 3-periodic metal-org. frameworks (MOFs) having the targeted soc topol. These cationic MOFs are isostructural to the parent indium-based MOF, In-soc-MOF-1a (for NO3-), previously reported by us, and likewise are constructed from the assembly of rigid μ3-oxygen-centered trinuclear metal carboxylate clusters, [M3O(O2C-)6], where M = In3+ or Fe3+. Each inorg. trinuclear mol. building block (MBB), generated in situ, is bridged by six 3,3',5,5'-azobenzenetetracarboxylate (ABTC4-) ligands to give the extended (4,6)-connected MOF, soc-MOF. In our previous work, we confirmed that the parent soc-MOF, i.e., In-soc-MOF-1a, possesses unique structural characteristics (e.g., vacant In binding sites and narrow pores with higher localized charge d.), which led to exceptional hydrogen (H2) storage capabilities. Therefore, charged MOFs with soc topol. can be viewed collectively as an ideal prototypical platform to examine the impact of specific structural parameters on H2-MOF interactions via systematic gas adsorption studies. We infer that enhanced binding of mol. H2 is primarily governed by the presence and type of vacant metal centers (i.e., Fe was shown to exhibit stronger H2-MOF interactions at low H2 loading compared to the In analogs). These findings are evident from the assocd. isosteric heat of adsorption (Qst) at low loadings and inelastic neutron scattering (INS) expts. of the rotational transitions of sorbed H2, as well as, temp.-programmed desorption (TPD) studies (for a select compd.). The importance of localized charge d. is also highlighted, where the extra-framework nitrate anions in the Fe-soc-MOF-1a (for NO3-) facilitate enhanced binding affinities as compared to the chloride analog. [on SciFinder(R)]

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Cairns, A.J., Eckert, J., Wojtas, L., Thommes, M., Wallacher, D., Georgiev, P.A.,... Eddaoudi, M. (2016). Gaining Insights on the H2-Sorbent Interactions: Robust soc-MOF Platform as a Case Study. Chemistry of Materials, 28(20), 7353-7361-7361.


Cairns, Amy J., et al. "Gaining Insights on the H2-Sorbent Interactions: Robust soc-MOF Platform as a Case Study." Chemistry of Materials 28.20 (2016): 7353-7361-7361.

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