Ab initio molecular dynamics study of the solvated OHCl- complex: implications for the atmospheric oxidation of chloride anion to molecular chlorine.
We have studied the OHCl(-) complex in a six-water cluster and in bulk liquid water by means of Born−Oppenheimer molecular dynamics based on generalized gradient-corrected BLYP density functional theory. Self-interaction-corrected results, which predict a hydrogen-bonded OH···Cl(-) complex, are compared to the uncorrected results, which predict a hemibonded (HO-Cl)(-). A second-order Møller−Plesset potential energy landscape of the gas-phase complex in its ground-state was computed to determine which of the two configurations represents the true nature of the complex. Because no evidence of a local minimum was found in the vicinity of the geometry corresponding to (HO-Cl)(-), we conclude that the self-interaction-corrected results are more accurate and, therefore, that the complex is held together by a hydrogen-bond-like interaction in both an asymmetric solvation environment, as represented by the cluster, and a symmetric solvation environment, as represented by the bulk system. We postulate that the mechanism that governs the atmospheric oxidation of Cl(-)(aq) to Cl(2)(g) on the surface of marine aerosols is initiated by the formation of a H-bonded OH···Cl(-) complex. Furthermore, because no evidence of charge transfer from Cl(-) to OH was found, in either the liquid or the cluster environment, we propose that the second step of the oxidation of Cl(-) is the reaction of the complex with a second Cl(-), resulting in the formation of the species Cl(2)(-) and OH(-). Cl(2)(g) could then be formed via an electron-transfer reaction with an impinging OH molecule.
D'Auria
Raffaella
R
Department of Chemistry and AirUCI, University of California, Irvine, Irvine, California 92697-2025, USA. rdauria@uci.edu
Kuo
I-F William
IF
Tobias
Douglas J
DJ
D001272:Atmosphere; D002712:Chlorides / Q000737:chemistry*; D002713:Chlorine / Q000737:chemistry*; D006860:Hydrogen Bonding; D006878:Hydroxides / Q000737:chemistry*; D007700:Kinetics; D008968:Molecular Conformation; D056004:Molecular Dynamics Simulation; D010084:Oxidation-Reduction; D011789:Quantum Theory; D012997:Solvents / Q000737:chemistry*; D014867:Water / Q000737:chemistry
D002712:Chlorides; D006878:Hydroxides; D012997:Solvents; D014867:Water; D002713:Chlorine; C031356:hydroxide ion