(620b) In Situ ATR-FTIR Analyses of CO2 Adsorption Processes in Porous Coordination Polymers

The adsorption/desorption behaviors for CO₂ on several different porous coordination polymers were studied using in situ attenuated total reflectance infrared spectroscopy in a high pressure cell.  The significant IR adsorption cross section of CO₂ and the sensitivity of its IR adsorption bands to the adsorption pore environment make the molecule well-suited for in situ IR investigations.  Give the potential benefits of the spectroscopic technique, literature reports of its use in the study of CO₂ adsorption processes in porous coordination polymers is surprising limited.  The experimental technique is shown to be a powerful tool for investigating the CO₂ adsorption mechanisms in a wide range of porous materials and composite compounds including structurally dynamic materials, porous spin crossover compounds, and mixed matrix coordination polymer/organic polymer composites. The in situ measurements under variable pressures of CO₂ also allow transitions in the host structures to be correlated with the CO₂ adsorption process making the technique particularly valuable in deriving a detailed description of the adsorption process in structurally dynamic materials.