Unravelling exceptional acetylene and carbon dioxide adsorption within a tetra-amide functionalized metal-organic framework.
Understanding the mechanism of gas-sorbent interactions is of fundamental importance for the design of improved gas storage materials. Here we report the binding domains of carbon dioxide and acetylene in a tetra-amide functionalized metal-organic framework, MFM-188, at crystallographic resolution. Although exhibiting moderate porosity, desolvated MFM-188a exhibits exceptionally high carbon dioxide and acetylene adsorption uptakes with the latter (232 cm3g-1at 295 K and 1 bar) being the highest value observed for porous solids under these conditions to the best of our knowledge. Neutron diffraction and inelastic neutron scattering studies enable the direct observation of the role of amide groups in substrate binding, representing an example of probing gas-amide binding interactions by such experiments. This study reveals that the combination of polyamide groups, open metal sites, appropriate pore geometry and cooperative binding between guest molecules is responsible for the high uptakes of acetylene and carbon dioxide in MFM-188a.
School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
Florian
F
Moreau
ISIS Neutron Facility, STFC Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, UK.
Ivan
0000-0002-4472-9675
I
da Silva
School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK.
Nada H
NH
Al Smail
School of Chemistry, Cardiff University, Cardiff CF10 3XQ, UK.
Timothy L
TL
Easun
School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
Mathew
0000-0002-9078-1845
M
Savage
School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
Harry G W
HG
Godfrey
ISIS Neutron Facility, STFC Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, UK.
Stewart F
0000-0002-3228-2570
SF
Parker
ISIS Neutron Facility, STFC Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, UK.
Pascal
P
Manuel
School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
Sihai
S
Yang
School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
Martin
M
Schröder