Deuterated Ethanol as a Probe for Measuring Equilibrium Isotope Effects for Hydroxyl Exchange

Area of Science:

• Chemistry
• Physical Chemistry
• Isotope Chemistry

Background:

• Hydroxyl proton exchange is fundamental in many chemical and biological processes.
• Understanding equilibrium isotope effects (EIE) provides insights into reaction mechanisms and molecular interactions.
• Quantifying EIE in various functional groups is crucial for chemical analysis.

Purpose of the Study:

• To measure and theoretically calculate equilibrium deuterium isotope effects for hydroxyl proton/deuteron exchange.
• To evaluate the utility of deuterated ethanol as a probe for hydroxyl exchange EIE.
• To explore the application of the 'one-atom isotope effect' for computational efficiency.

Main Methods:

• Nuclear Magnetic Resonance (NMR) spectroscopy was employed to measure EIE.
• Theoretical calculations were performed to determine EIE.
• Deuterated ethanol was utilized as a probe molecule.

Main Results:

• Equilibrium deuterium isotope effects were successfully measured for hydroxyl exchange in tert-butanol, phenol, ethanethiol, diethylamine, and ethanol.
• Deuterated ethanol demonstrated effectiveness as a probe for hydroxyl exchange EIE.
• The 'one-atom isotope effect' method was applied to streamline calculations.

Conclusions:

• The study successfully quantified EIE for hydroxyl exchange across diverse organic molecules.
• Deuterated ethanol is a viable and efficient probe for studying hydroxyl exchange EIE.
• Computational methods, including the 'one-atom isotope effect', can accurately predict and aid in the study of EIE.