Research output: Contribution to journal › Article › peer-review
Tailoring porosity and rotational dynamics in a series of octacarboxylate metal-organic frameworks. / Moreau, Florian; Kolokolov, Daniil I.; Stepanov, Alexander G. et al.
In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 114, No. 12, 21.03.2017, p. 3056-3061.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Tailoring porosity and rotational dynamics in a series of octacarboxylate metal-organic frameworks
AU - Moreau, Florian
AU - Kolokolov, Daniil I.
AU - Stepanov, Alexander G.
AU - Easun, Timothy L.
AU - Dailly, Anne
AU - Lewis, William
AU - Blake, Alexander J.
AU - Nowell, Harriott
AU - Lennox, Matthew J.
AU - Besley, Elena
AU - Yang, Sihai
AU - Schröder, Martin
PY - 2017/3/21
Y1 - 2017/3/21
N2 - Modulation and precise control of porosity of metal-organic frameworks (MOFs) is of critical importance to their materials function. Here we report modulation of porosity for a series of isoreticular octacarboxylate MOFs, denoted MFM-180 to MFM-185, via a strategy of selective elongation of metal-organic cages. Owing to the high ligand connectivity, these MOFs do not show interpenetration, and are robust structures that have permanent porosity. Interestingly, activated MFM-185a shows a high Brunauer-Emmett-Teller (BET) surface area of 4,734 m2 g-1 for an octacarboxylate MOF. These MOFs show remarkable CH4 and CO2 adsorption properties, notably with simultaneously high gravimetric and volumetric deliverable CH4 capacities of 0.24 g g-1 and 163 vol/vol (298 K, 5-65 bar) recorded for MFM-185a due to selective elongation of tubular cages. The dynamics of molecular rotors in deuterated MFM-180a-d16 and MFM- 181a-d16 were investigated by variable-temperature 2H solid-state NMR spectroscopy to reveal the reorientation mechanisms within these materials. Analysis of the flipping modes of the mobile phenyl groups, their rotational rates, and transition temperatures paves the way to controlling and understanding the role of molecular rotors through design of organic linkers within porous MOF materials.
AB - Modulation and precise control of porosity of metal-organic frameworks (MOFs) is of critical importance to their materials function. Here we report modulation of porosity for a series of isoreticular octacarboxylate MOFs, denoted MFM-180 to MFM-185, via a strategy of selective elongation of metal-organic cages. Owing to the high ligand connectivity, these MOFs do not show interpenetration, and are robust structures that have permanent porosity. Interestingly, activated MFM-185a shows a high Brunauer-Emmett-Teller (BET) surface area of 4,734 m2 g-1 for an octacarboxylate MOF. These MOFs show remarkable CH4 and CO2 adsorption properties, notably with simultaneously high gravimetric and volumetric deliverable CH4 capacities of 0.24 g g-1 and 163 vol/vol (298 K, 5-65 bar) recorded for MFM-185a due to selective elongation of tubular cages. The dynamics of molecular rotors in deuterated MFM-180a-d16 and MFM- 181a-d16 were investigated by variable-temperature 2H solid-state NMR spectroscopy to reveal the reorientation mechanisms within these materials. Analysis of the flipping modes of the mobile phenyl groups, their rotational rates, and transition temperatures paves the way to controlling and understanding the role of molecular rotors through design of organic linkers within porous MOF materials.
KW - CH
KW - CO
KW - Copper
KW - Metal-organic framework
KW - Molecular rotors
KW - STORAGE
KW - POROUS COORDINATION POLYMERS
KW - molecular rotors
KW - BUILDING-BLOCKS
KW - MOLECULAR ROTORS
KW - CO2
KW - TEREPHTHALATE PHENYLENES
KW - ADSORPTION
KW - CH4
KW - metal-organic framework
KW - FUNCTIONALIZATION
KW - HYDROGEN
KW - copper
KW - LIGAND
KW - CARBON-DIOXIDE
UR - http://www.scopus.com/inward/record.url?scp=85016102050&partnerID=8YFLogxK
U2 - 10.1073/pnas.1615172114
DO - 10.1073/pnas.1615172114
M3 - Article
C2 - 28280097
AN - SCOPUS:85016102050
VL - 114
SP - 3056
EP - 3061
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
SN - 0027-8424
IS - 12
ER -
ID: 10267908