Ab Initio and DFT Studies on CO2 Interacting with Zn(q+)-Imidazole (q=0, 1, 2) Complexes: Prediction of Charge Transfer through σ- or π-Type Models

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Prakash MuthuramalingamMuneerah M Al-Mogren

Abstract

Using first-principles methodologies, the equilibrium structures and the relative stability of CO2 @[Zn(q+) Im] (where q=0, 1, 2; Im=imidazole) complexes are studied to understand the nature of the interactions between the CO2 and Zn(q+) -imidazole entities. These complexes are considered as prototype models mimicking the interactions of CO2 with these subunits of zeolitic imidazolate frameworks or Zn enzymes. These computations are performed using both ab initio calculations and density functional theory. Dispersion effects accounting for long-range interactions are considered. Solvent (water) effects were also considered using a polarizable continuum model approach. Natural bond orbital, charge, frontier orbital and vibrational analyses clearly reveal the occurrence of charge transfer through covalent and noncovalent interactions. Moreover, it is found that CO2 can adsorb through more favorable π-type stacking as well as σ-type hydrogen-bonding interactions. The inter-monomer interaction potentials show a significant anisotropy that might induce CO2 orientation and site-selectivity effects in porous materials and in active sites of Zn enzymes. Hence, this study provides valuable information about how CO2 adsorption takes plac...Continue Reading

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Nov 3, 2016·Physical Chemistry Chemical Physics : PCCP·Reda BoulmèneMajdi Hochlaf
Apr 11, 2017·Chemical Reviews·Jiamei YuPerla B Balbuena
Jul 27, 2017·Physical Chemistry Chemical Physics : PCCP·Majdi Hochlaf
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