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• W3133268162 abstract "We performed ab initio molecular dynamics (AIMD) simulations to benchmark bulk liquid structures and to evaluate results from all-atom force field molecular dynamics (FFMD) simulations with the generalized Amber force field (GAFF) for organophosphorus (OP) and organochlorine (OC) compounds. Our work also addresses the current and important topic of force field validation, applied here to a set of nonaqueous organic liquids. Our approach differs from standard treatments, which validate force fields based on thermodynamic data. Utilizing radial distribution functions (RDFs), our results show that GAFF reproduces the AIMD-predicted asymmetric liquid structures moderately well for OP compounds that contain bulky alkyl groups. Among the OCs, RDFs obtained from FFMD overlap well with AIMD results, with some offsets in position and peak structuring. However, re-parameterization of GAFF for some OCs is needed to reproduce fully the liquid structures predicted by AIMD. The offsets between AIMD and FFMD peak positions suggest inconsistencies in the developed force fields, but, in general, GAFF is able to capture short-ranged and long-ranged interactions of OPs and OCs observed in AIMD. Along with the local coordination structure, we also compared enthalpies of vaporization. Overall, calculated bulk properties from FFMD compared reasonably well with experimental values, suggesting that small improvements within the FF should focus on parameters that adjust the bulk liquid structures of these compounds." @default.
• W3133268162 created "2021-03-01" @default.
• W3133268162 creator A5030102792 @default.
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• W3133268162 date "2021-02-23" @default.
• W3133268162 modified "2023-10-16" @default.
• W3133268162 title "<i>Ab initio</i> and force field molecular dynamics study of bulk organophosphorus and organochlorine liquid structures" @default.
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• W3133268162 doi "https://doi.org/10.1063/5.0033426" @default.
• W3133268162 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33639727" @default.
• W3133268162 hasPublicationYear "2021" @default.
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