Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 24, Issue 28, Pages 16973-16978Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2cp01816k
Keywords
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Funding
- National Natural Science Foundation of China [22073112, 21873012]
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Two efficient methods for measuring acidity of acidic deep eutectic solvents (ADESs) were developed in this study, providing insights into the performance relationship and molecular basis for optimizing their applications.
Acidic deep eutectic solvents (ADESs) have been utilized in various applications. Clearly, it is crucial to obtain acidity information that could reveal the relationship with performance. However, appropriate methods for measuring acidity are limited. Herein, we developed two promising approaches (without additional solvents) to identify and characterize both Lewis and Bronsted acidities by applying acetonitrile as an infrared probe and trimethylphosphine oxide (TMPO) as a nuclear magnetic resonance (NMR) probe. The acetonitrile IR approach is suitable for measuring the acidity of Lewis ADESs by monitoring the peak of nu((C N)) around 2300 cm(-1), and the P-31-TMPO NMR approach could identify and scale both Lewis and Bronsted acidities precisely. Moreover, a perfect linear relationship between the IR shift of nu((C N)) and the effective charge density of metal cations was established, which provides a better understanding of Lewis acidity. In short, this study not only offers two efficient acidity measurement methods but also provides a molecular basis for optimizing the performance of ADESs in applications.
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