Evidence of CO2 molecule acting as an electron acceptor on a nanoporous metal–organic-framework MIL-53 or Cr3+(OH)(O2C–C6H4–CO2)?

Chemical Communications Pub Date: 2007-06-08 DOI: 10.1039/B703468G

Abstract

The adsorption mode of CO2 at low coverage in the nanoporous metal benzenedicarboxylate MIL-53(Cr) or Cr3+(OH)(O2C–C6H4–CO2) has been identified using IR spectroscopy; the red shift of the ν3 band and the splitting of the ν2 mode of CO2 in addition to the shifts of the ν(OH) and δ(OH) bands of the MIL-53(Cr) hydroxyl groups provide evidence that CO2 interacts with the oxygen atoms of framework OH groups as an electron-acceptor via its carbon atom; this is the first example of such an interaction between CO2 and bridged OH groups in a solid.

Graphical abstract: Evidence of CO2 molecule acting as an electron acceptor on a nanoporous metal–organic-framework MIL-53 or Cr3+(OH)(O2C–C6H4–CO2)
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