Molecular Dynamics Simulation of Two Toluene Molecules in Vacuum Using GROMACS
Prasha Maskey (1) (1) St. Xavier’s College, Loyola Campus — Kathmandu, Nepal
Toluene is an extensively used solvent for chemical synthesis and pharmaceutical production. In spite of its abundant use, the dynamics of its bimolecular interactions remain insufficiently characterised in scientific literature. In this study, GROMACS was employed to investigate collision dynamics between two molecules of toluene to identify energy exchange mechanisms. This draws a simple analogy to high-energy particle physics, specifically particle accelerators, where particles are accelerated to probe forceful collisions in order to understand energy exchange mechanisms. The simulation included energy minimisation, NVT equilibration and MD runs. The system reached the target temperature of 298 K and remained stable throughout the equilibration process. Analysis of distance graphs revealed that the centre-of-mass distance became stable at approximately 3.8 nm and the minimum atomic separation at about 3.2 nm, meaning under these specific experimental conditions, no direct collision occurs between two toluene molecules. These results demonstrate that toluene-toluene interactions exist in a dynamic equilibrium governed by van der Waals forces, and no stable aggregate is formed upon interaction.
Keywords: molecular dynamics simulation, GROMACS simulation, toluene-toluene interaction, van der Waals forces molecular simulation, computational chemistry
Article Type: Original Research
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What an insightful post! Your detailed exploration of toluene's molecular dynamics using GROMACS is fascinating. It makes me think about how similar principles could apply in other areas, like the strategic moves in drift boss. Thanks for sharing such amazing research!
I tried a similar two-molecule vacuum run a while back and was surprised how sensitive the trajectory was to the starting orientation.
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Did the authors test more than one initial configuration, or does a single setup hold up well enough for this system?
What stuck with me was running just two toluene molecules in vacuum and letting GROMACS reveal whether they dimerize through pi-stacking without solvent interference.
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It made me wonder how much the initial orientation and force field choice shape that contact, especially for such a small system.
I like that they ran the pair in vacuum first, mirroring how bench chemists isolate a system before adding solvent.
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Most MD tutorials jump straight to a solvated box, so starting from two molecules alone makes the pi-stacking geometry much easier to actually see.