Stopped-Flow FT-IR Spectroscopy of Aqueous Solutions Using Attenuated Total Reflectance
| Autor: | Jonathan R. Marda, Edward M. Eyring, Brian C. Dunn |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Aqueous solution
Chemistry business.industry 010401 analytical chemistry Flow (psychology) Analytical chemistry Infrared spectroscopy 01 natural sciences Chemical reaction 0104 chemical sciences 010309 optics Optics Ultraviolet visible spectroscopy Attenuated total reflection 0103 physical sciences Fourier transform infrared spectroscopy business Spectroscopy Instrumentation |
| Zdroj: | Applied Spectroscopy. 56:751-755 |
| ISSN: | 1943-3530 0003-7028 |
| DOI: | 10.1366/000370202760077711 |
| Popis: | An apparatus for the study of solution phase kinetics using FT-IR spectroscopy has been developed. The observation chamber consists of an integrated tangential mixer-flow cell and a ZnSe element permitting attenuated total reflectance (ATR) measurements. The short optical pathlength afforded by ATR allows mid-IR observation of chemical reactions in aqueous solution, including the spectral region near the water bending vibration (1640 cm−1). High hydraulic backpressures required to force solution rapidly through a thin layer flow cell are not necessary with the ATR flow cell because the optical pathlength and the flow cross-section have been decoupled, allowing for a relativity large flow chamber when compared with instruments incorporating a transmission flow cell. Overall system performance has been evaluated using the hydrolysis of methylchloroacetate as a test reaction. The feasibility of observing reactions with initial half-lives of approximately 250 ms is demonstrated. The system is very robust, with little risk of damaging the optics during routine maintenance. |
| Databáze: | OpenAIRE |
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