A quantum mechanics-molecular mechanics study of dissociative electron transfer : The methylchloride radical anion in aqueous solution
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A quantum mechanics-molecular mechanics study of dissociative electron transfer : The methylchloride radical anion in aqueous solution

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A quantum mechanics-molecular mechanics study of dissociative electron transfer : The methylchloride radical anion in aqueous solution

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dc.contributor.author Soriano, Alejandro
dc.contributor.author Silla Santos, Estanislao
dc.contributor.author Tuñón, Iñaki
dc.date.accessioned 2010-06-14T08:06:10Z
dc.date.available 2010-06-14T08:06:10Z
dc.date.issued 2002
dc.identifier.uri http://hdl.handle.net/10550/12941
dc.language.iso en en
dc.relation http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=JCPSA6000116000014006102000001&idtype=cvips&prog=normal&doi=10.1063/1.1453955 en
dc.source SORIANO, Alejandro ; SILLA, Estanislao ; TUÑÓN, Iñaki. A quantum mechanics-molecular mechanics study of dissociative electron transfer: The methylchloride radical anion in aqueous solution. En: Journal of Chemical Physics, 2002, vol. 116, no. 14 en
dc.subject Organic compounds ; Dissociation ; Charge exchange ;Free radicals ; Negative ions ; Molecular dynamics method ; Digital simulation en
dc.title A quantum mechanics-molecular mechanics study of dissociative electron transfer : The methylchloride radical anion in aqueous solution en
dc.type info:eu-repo/semantics/article en
dc.type info:eu-repo/semantics/publishedVersion en
dc.subject.unesco UNESCO::FÍSICA::Química física en
dc.identifier.doi 10.1063/1.1453955 en
dc.description.abstractenglish The dissociative electron transfer reaction CH3Cl+e−→CH3•+Cl− in aqueous solution is studied by using a QM/MM method. In this work the quantum subsystem (a methylchloride molecule plus an electron) is described using density functional theory while the solvent (300 water molecules) is described using the TIP3P classical potential. By means of molecular dynamics simulations and the thermodynamic integration technique we obtained the potential of mean force (PMF) for the carbon–chlorine bond dissociation of the neutral and radical anion species. Combining these two free energy curves we found a quadratic dependence of the activation free energy on the reaction free energy in agreement with Marcus’ relationship, originally developed for electron transfer processes not involving bond breaking. We also investigated dynamical aspects by means of 60 dissociative trajectories started with the addition of an extra electron to different configurations of a methylchloride molecule in solution. The PMF shows the existence of a very flat region, in which the system is trapped during some finite time if the quantum subsystem quickly losses its excess kinetic energy transferring it to the solvent molecules. One of the most important factors determining the effectiveness of this energy transfer seems to be the existence of close contacts (hydrogen bonds) between the solute and the solvent. en
dc.description.private Estanislao.Silla@uv.es Ignacio.Tunon@uv.es en
dc.identifier.idgrec 015946 en

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