where it has been shown to significantly modulate electronic transitions, 8 help sustain or otherwise modify excited state coherent nuclear dynamics, and mediate intramolecular electron transfer. As experiments move towards mapping out the explicit molecular mechanisms of the solvent influence on e.g. bond-formation or charge-transfer 16 reactions, more accurate and general theoretical models are needed to support this e↵ort. The analysis of experimental measurements carried out on these systems rests on molecular simulations where the accuracy of the results depend strongly on the quality of the interaction potential (or 'force field') used for the ACN interactions.