Abstract
The reaction force F(ξ) is the negative gradient of the potential energy of a chemical process along the intrinsic reaction coordinate ξ. We extend the rigorous concept of F(ξ) to the “activation strain model” of Bickelhaupt et al., to formulate the “strain” force F str(ξ) that retards a reaction and the “interaction” force F int(ξ) that drives it. These are investigated for a group of Diels-Alder cycloadditions. The results fully support the interpretation of the minimum of F(ξ) as defining the beginning of the transition from deformed reactants to eventual products.
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Acknowledgments
The activation strain model of Bickelhaupt et al. was brought to our attention by Professor Bickelhaupt’s presentation in the Virtual Conference on Computational Chemistry (VCCC-2013) organized by Professor Ponnadurai Ramasami. We would like to express our appreciation to both of them. The authors also acknowledge Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT) through the project N° 1100291. D.Y. thanks La Comisión Nacional de Investigación Científica y Tecnológica (CONICYT) for a PhD fellowship.
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This paper belongs to Topical Collection MIB 2013 (Modeling Interactions in Biomolecules VI)
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Politzer, P., Murray, J.S., Yepes, D. et al. Driving and retarding forces in a chemical reaction. J Mol Model 20, 2351 (2014). https://doi.org/10.1007/s00894-014-2351-0
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DOI: https://doi.org/10.1007/s00894-014-2351-0