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Description
Title: | THE ETHANOL-CO2 DIMER IS AN ELECTRON DONOR-ACCEPTOR COMPLEX |
Author(s): | McGuire, Brett A. |
Contributor(s): | McCarthy, Michael C.; Martin-Drumel, Marie-Aline |
Subject(s): | Clusters/Complexes |
Abstract: | Supercritical (sc) CO$_2$ is a common industrial solvent for the extraction of caffeine, nicotine, petrochemicals, and natural products. The ability of apolar scCO$_2$ to dissolve polar solutes is greatly enhanced by the addition of a polar co-solvent, often methanol or ethanol. Experimental and theoretical work show that methanol interactions in scCO$_2$ are predominantly hydrogen bonding, while the gas-phase complex is an electron donor-acceptor (EDA) configuration. Ethanol, meanwhile, is predicted to form EDA complexes both in scCO$_2$ and in the gas phase, but there have been no experimental measurements to support this conclusion. Here, we report a combined chirped-pulse and cavity FTMW study of the ethanol-CO$_2$ complex. Comparison with theory indicates the EDA complex is dominant under our experimental conditions. We confirm the structure with isotopic substitution, and derive a semi-experimental equilibrium structure. Our results are consistent with theoretical predictions that the linearity of the CO$_2$ subgroup is broken by the complexation interaction. |
Issue Date: | 6/22/2017 |
Publisher: | International Symposium on Molecular Spectroscopy |
Citation Info: | APS |
Genre: | Conference Paper / Presentation |
Type: | Text |
Language: | English |
URI: | http://hdl.handle.net/2142/97189 |
DOI: | 10.15278/isms.2017.RH06 |
Date Available in IDEALS: | 2017-07-27 2018-01-29 |