Synergistic interaction of Re complex and amine functionalized multiple ligands in metal-organic frameworks for conversion of carbon dioxide

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A metal-organic framework (MOF) is composed of secondary building units (SBUs) of metal ions and organic ligands to link each SBU. Moreover, the photosynthetic synthesis of a valuable CO chemical from carbon dioxide (CO2) represents an important class of appealing methods. Herein, we find that a molecular photocatalyst with high selectivity and activity can be designed via a fine balance in the proximity of Re complex (ReI(CO)(3)(BPYDC)(Cl), BPYDC = 2,2'-bipyridine-5,5'-dicarboxylate) and -NH2 functionalized multiple ligands composing a MOF photocatalyst, denoted as Re-MOF-NH2. These ligands in Re-MOF-NH2 has been confirmed by infrared, UV-visible, and H-1 nuclear magnetic resonance spectra. Moreover, we show from extended X-ray absorption fine structure and in-situ infrared spectra that the bond corresponding to Re-CO upon introduction of-NH2 functional groups is divided into asymmetric bonds of 1.4 angstrom and 2.3 angstrom along with different CO2 vibrations, thus making the configuration of carbonyl groups in a Re metal complex become asymmetric in addition to aiding formation of CO2 intermediates within Re-MOF-NH2. Indeed, both of the uneven electron distribution in asymmetric carbonyl groups for Re-CO and the intermolecular stabilization of carbamate intermediates are proven to give the approximately 3-fold increase in photocatalytic activity for conversion of CO2 into CO.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2017-04
Language
English
Article Type
Article
Keywords

PHOTOCATALYTIC CO2 REDUCTION; WATER OXIDATION; CATALYSTS; FORMATE; SILICA

Citation

SCIENTIFIC REPORTS, v.7

ISSN
2045-2322
DOI
10.1038/s41598-017-00574-1
URI
http://hdl.handle.net/10203/223697
Appears in Collection
EEW-Journal Papers(저널논문)
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