Abstract
Hydrogen bonds dominate many chemical and biological processes, and chemical modification enables control and modulation of host-guest systems. Here we report a targeted modification of hydrogen bonding and its effect on guest binding in redox-active materials. MFM-300(VIII) {[VIII 2 (OH)2 (L)], LH4 =biphenyl-3,3′,5,5′-tetracarboxylic acid} can be oxidized to isostructural MFM-300(VIV), [VIV 2 O2 (L)], in which deprotonation of the bridging hydroxyl groups occurs. MFM-300(VIII) shows the second highest CO2 uptake capacity in metal-organic framework materials at 298 K and 1 bar (6.0 mmol g-1) and involves hydrogen bonding between the OH group of the host and the O-donor of CO2, which binds in an end-on manner, =1.863(1) Å. In contrast, CO2-loaded MFM-300(VIV) shows CO2 bound side-on to the oxy group and sandwiched between two phenyl groups involving a unique OCO2 ···c.g.phenyl interaction [3.069(2), 3.146(3) Å]. The macroscopic packing of CO2 in the pores is directly influenced by these primary binding sites.
Original language | English |
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Article number | 14212 |
Journal | Nature Communications |
Volume | 8 |
DOIs | |
State | Published - Feb 13 2017 |
Funding
We thank EPSRC, ERC and University of Manchester for funding. We thank EPSRC for funding of the UK National EPR Facility at Manchester. We are especially grateful to STFC and the ISIS Neutron Facility for access to the Beamlines TOSCA and WISH, to Diamond Light Source for access to Beamline B22, to the Advanced Light Source for access to Beamline 11.3.1 and to ORNL for access to Beamline VISION. The computing resources were made available through the VirtuES (Virtual Experiments in Spectroscopy) project, funded by Laboratory Directed Research and Development program (LDRD 7739) at the Oak Ridge National Laboratory. The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The development of the gas cell used in this work was partially funded by the Center for Gas Separations Relevant to Clean Energy Technologies, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award # DE-SC0001015.
Funders | Funder number |
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VirtuES | |
U.S. Department of Energy | DE-AC02-05CH11231 |
Office of Science | |
Basic Energy Sciences | DE-SC0001015 |
Oak Ridge National Laboratory | |
Laboratory Directed Research and Development | LDRD 7739 |
Horizon 2020 Framework Programme | 742401 |
Engineering and Physical Sciences Research Council | |
Science and Technology Facilities Council | |
University of Manchester | |
European Research Council |