Lee, Hyunjoo Jung, Young Mee Lee, Keun Im Kim, Hoon Sik Park, Ho Seok 2024-01-20T11:02:19Z 2024-01-20T11:02:19Z 2021-09-05 2013-12 2046-2069 https://pubs.kist.re.kr/handle/201004/127395 Control of the interaction between sorbents and acid gases (SO2 and CO2) is of prime importance for a fundamental understanding of acid-base chemistry to aid in the development of new absorbents. However, delicated and precise monitoring of the reaction dynamics by conventional one-dimensional (1D) spectroscopy is still challenging due to overlapping bands and restricted static information. Herein, we investigated the unique interactions of an amine-containing ionic compound, [Bztmeda][MeSO3], and SO2, which are related to the high absorption capacity and reversibility of the reaction, by principal component analysis (PCA) and two-dimensional infrared correlation spectroscopy (2D IR COS). The physical transition of [Bztmeda][MeSO3], arising from the hydrogen bonding interactions with SO2, could not be observed by 1D IR spectra, but was captured by PCA analysis. Synchronous 2D correlation spectra demonstrated that the absorption of SO2 was derived from the hydrogen bonding interactions between the tertiary amine groups of [Bztmeda] cations and the oxygen atoms of SO2 and/or between the sulfonate groups of [MeSO3] anions (bridged by water molecules) and the oxygen atoms of SO2. Asynchronous 2D correlation spectra decoupled the new bands of amine and sulfonate groups under the different chemical environments, showing the order of the actual sequence of the SO2 absorption processes. English ROYAL SOC CHEMISTRY FLUE-GAS LIQUIDS SPECTROSCOPY CAPTURE Understanding the unique interaction of amine-containing ionic compounds with SO2 for high absorption capacity Article 10.1039/c3ra45052j 1 RSC ADVANCES, v.3, no.48, pp.25944 - 25949 RSC ADVANCES 3 48 25944 25949 scie scopus 000327261700064 2-s2.0-84887980279 Chemistry, Multidisciplinary Chemistry Article FLUE-GAS LIQUIDS SPECTROSCOPY CAPTURE