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Hydrogen Storage and Selective, Reversible O2 Adsorption in a Metal-Organic Framework with Open Chromium(II) Sites



Eric D. Bloch, Wendy L. Queen, Matthew Ross Hudson, Jarad A. Mason, Dianne J. Xiao, Leslie J. Murray, Roxana Flacau, Craig Brown, Jeffrey R. Long


A chromium(II)-based metal-organic framework, Cr3[Cr4Cl)3(BTT)8]2 (Cr-BTT;BTT3- = 1,3,5-benzenetrisetrazolate), featuring coordinatively-unsaturated, redox-active Cr2+ cation sites was synthesized and investigated for potential applications in H2 adsorption and neutron powder diffraction experiments reveal moderately strong Cr-H2 interactions, in line with results from previously reported M-BTT frameworks. Notably, gas adsorption measurements also reveal excellent O2/N2 selectivity with substantial O2 reversibility at room temperature, based on selective electron transfer to form CrIII- superoxide moieties. Infrared spectroscopy and powder neutron diffraction experiments were used to confirm this mechanism of selective O2 binding.
Angewandte Chemie-International Edition


hydrogen storage, neutron diffraction, metal organic framework


Bloch, E. , Queen, W. , Hudson, M. , Mason, J. , Xiao, D. , Murray, L. , Flacau, R. , Brown, C. and Long, J. (2016), Hydrogen Storage and Selective, Reversible O<sub>2</sub> Adsorption in a Metal-Organic Framework with Open Chromium(II) Sites, Angewandte Chemie-International Edition, [online], (Accessed April 16, 2024)
Created July 17, 2016, Updated October 12, 2021