A general purpose acetonitrile interaction potential to describe its liquid, solid and gas phases
A flexible and polarizable force field to describe acetonitrile in its three states of matter has been developed on the basis of an ab initio potential energy surface at the MP2 level. The acetonitrile molecule is represented by a sophisticated twelve-site model: the six nuclei plus six mobile charg...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Universidad de Sevilla (US) |
| Repositorio: | idUS. Depósito de Investigación de la Universidad de Sevilla |
| OAI Identifier: | oai:idus.us.es:11441/152726 |
| Acceso en línea: | https://hdl.handle.net/11441/152726 https://doi.org/10.1016/j.molliq.2020.113975 |
| Access Level: | acceso abierto |
| Palabra clave: | Ab initio force field Polarizable and flexible acetonitrile model MD simulations X-ray and neutron diffractograms Physicochemical properties Acetonitrile crystals |
| Sumario: | A flexible and polarizable force field to describe acetonitrile in its three states of matter has been developed on the basis of an ab initio potential energy surface at the MP2 level. The acetonitrile molecule is represented by a sophisticated twelve-site model: the six nuclei plus six mobile charges. Three thousands structures have been employed for the fitting including monomers, dimers and trimers. Gas phase behavior has been tested by analyzing aggregates from dimers to 27-mer which give accurate reproducibility of the experimental and quantummechanical results. Classical MD simulations have been performed for the liquid and its crystalline α- and βforms. An analysis of liquid in a wide range of structural, dynamic, energetics and spectroscopic properties has been performed, as well as neutron diffraction data. Comparison with experimental information is satisfactory. Due to the first principles nature and the polarizable character of this force field properties of the three states of matter are properly reproduced. |
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