Abstract
A computational study of metal difluorides (MF2; M = Ca to Zn) and their interactions with carbon dioxide and water molecules was performed. The structural parameter values obtained and the results of AIM analysis and energy decomposition analysis indicated that the Ca–F bond is weaker and less ionic than the bonds in the transition metal difluorides. A deformation density plot revealed the stablizing influence of the Jahn–Teller effect in nonlinear MF2 molecules (e.g., where M= Sc, Ti, Cr). An anaysis of the metal K-edge peaks of the difluorides showed that shifts in the edge energy were due to the combined effects of the ionicity, effective nuclear charge, and the spin state of the metal. The interactions of CO2 with ScF2 (Scc3 geometry) and TiF2 (Tic2 geometry) caused CO2 to shift from its usual linear geometry to a bent geometry (η2(C=O) binding mode), while it retained its linear geometry (η1(O) binding mode) when it interacted with the other metal difluorides. Energy decomposition analysis showed that, among the various geometries considered, the Scc3 and Tic2 geometries possessed the highest interaction energies and orbital interaction energies. Heavier transition metal difluorides showed stronger affinities for H2O, whereas the lighter transition metal (Sc and Ti) difluorides preferred CO2. Overall, the results of this study suggest that fluorides of lighter transition metals with partially filled d orbitals (e.g., Sc and Ti) could be used for CO2 capture under moist conditions.
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Acknowledgements
This work was supported by the INSPIRE program under the Department of Science and Technology, India [DST/INSPIRE fellowship/2015/IF0672].
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Arokiyanathan, A.L., Lakshmipathi, S. Molecular properties of metal difluorides and their interactions with CO2 and H2O molecules: a DFT investigation. J Mol Model 23, 345 (2017). https://doi.org/10.1007/s00894-017-3511-9
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DOI: https://doi.org/10.1007/s00894-017-3511-9