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Enhanced Diffusion of Molecular Catalysts Is Due to Convection

preprint
revised on 14.06.2019 and posted on 14.06.2019 by Thomas MacDonald, William S. Price, R. Dean Astumian, Jonathon Beves
Intriguing reports of enhanced diffusion in enzymes and molecular catalysts have spurred significant interest in experimental and theoretical investigations of this phenomenon, with mechanistic understanding the subject of ongoing and lively debate. Here we use time-resolved diffusion NMR methods to measure the diffusion coefficients of small molecule species involved in chemical reactions with high temporal resolution. We show the enhanced diffusion of small molecules cannot be explained by reaction velocity, and that apparent measurements of enhanced diffusion by small molecules appear to be caused by bulk fluid flow processes such as convection.

Funding

Australian Research Council FT170100094

History

Email Address of Submitting Author

j.beves@unsw.edu.au

Institution

UNSW Sydney

Country

Australia

ORCID For Submitting Author

0000-0002-5997-6580

Declaration of Conflict of Interest

No conflicts of interest

Exports