Exploration and Validation of Force Field Design Protocols through QM-to-MM Mapping

21 December 2021, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


The scale of the parameter optimisation problem in traditional molecular mechanics force field construction means that design of a new force field is a long process, and sub-optimal choices made in the early stages can persist for many generations of the force field. We hypothesise that careful use of quantum mechanics to inform molecular mechanics parameter derivation (QM-to-MM mapping) should be used to significantly reduce the number of parameters that require fitting to experiment and increase the pace of force field development. Here, we design a collection of 15 new protocols for small, organic molecule force field design, and test their accuracy against experimental liquid properties. Our best performing model has only seven fitting parameters, yet achieves mean unsigned errors of just 0.031 g/cm3 and 0.69 kcal/mol in liquid densities and heats of vaporisation, compared to experiment. The software required to derive the designed force fields is freely available at https://github.com/qubekit/QUBEKit.


Quantum mechanics
Force field
Molecular mechanics
Virtual site

Supplementary materials

Supporting Information for: Exploration and Validation of Force Field Design Protocols through QM-to-MM Mapping
Supporting methods, theory and data.


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