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A refined general AMBER force field for liquid acetonitrile: Development and validation.

Noah Deveaux1, Benoît Champagne1, Tárcius N Ramos1

  • 1Laboratory of Theoretical Chemistry, Namur Institute of Structured Matter, University of Namur, Rue de Bruxelles 61, Namur 5000, Belgium.

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A new force field, GAFF-ACN, accurately models liquid acetonitrile properties. This general AMBER force field (GAFF) provides precise density and dielectric constants for molecular dynamics simulations.

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Area of Science:

  • Computational Chemistry
  • Molecular Dynamics Simulations
  • Physical Chemistry

Background:

  • Accurate molecular models are crucial for simulating liquid properties.
  • Existing force fields may not precisely capture acetonitrile's behavior.
  • Developing specialized force fields enhances simulation accuracy.

Purpose of the Study:

  • Introduce GAFF-ACN, a refined general AMBER force field for liquid acetonitrile.
  • Achieve accurate reproduction of experimental density and static dielectric constant.
  • Provide a reliable model for solvation studies of organic solutes.

Main Methods:

  • Parameterization using quantum-mechanically derived geometry and restrained electrostatic potential charges.
  • Incorporation of standard GAFFv2.11 parameters and enforced molecular linearity.
  • Classical NPT molecular dynamics (MD) simulations.

Main Results:

  • GAFF-ACN closely reproduces experimental acetonitrile density (-0.4% error).
  • Achieved a highly accurate static dielectric constant (13% error), the best for a fixed-charge model.
  • Successfully modeled thermodynamic observables, transport coefficients, and structural properties.

Conclusions:

  • GAFF-ACN offers an accurate and practical model for liquid acetonitrile.
  • The force field enables reproducible simulations across common MD packages.
  • It is suitable for solvation studies involving GAFF-parameterized organic solutes.