Adsorption properties and structure of CO2 adsorbed on open coordination sites of metal-organic framework Ni-2(dhtp) from gas adsorption, IR spectroscopy and X-ray diffraction

The microporous metal-organic framework Ni-2(dhtp) (H(4)dhtp = 2,5-dihydroxyterephthalic acid) shows distinct end-on CO2 coordination to coordinatively unsaturated nickel sites giving rise to high CO2 adsorption capacity at sub-atmospheric pressures and ambient temperatures.