{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,12]],"date-time":"2026-07-12T01:35:40Z","timestamp":1783820140963,"version":"3.55.0"},"reference-count":45,"publisher":"AIP Publishing","issue":"21","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2006,6,7]]},"abstract":"<jats:p>A molecular association between chloroform and sulfur dioxide in the gas phase at room temperature was studied by Fourier transform infrared spectroscopy. Since the intensity of the CH-stretching fundamental vibration of monomer chloroform is very weak but much stronger upon complexation, a simple subtraction procedure isolated the CH-stretching vibration spectrum of the complex. The presence of a 1:1 complex was confirmed by two dilution series, where the monomer concentrations were varied. The molecular association manifested itself as a shift of the peak absorbance of the CH-stretching vibration of CHCl3\u2013SO2 by +7cm\u22121 and of the CD-stretching vibration of CDCl3\u2212SO2 by +5cm\u22121 to higher wave numbers compared to monomer chloroform, accompanied by a considerable broadening of the band contour. In agreement with previous ab initio calculations, this indicates a \u201cblueshifting\u201d or more appropriately, a \u201cC\u2013H contracting\u201d hydrogen bond between chloroform and sulfur dioxide. An estimate of the complex concentration was made based on ab initio calculations for the integrated band strength and the measured spectrum. With this estimate, the equilibrium constant Kp\u2008(295K)=0.014\u2008(po=105Pa) for the dimerization was calculated, providing one of the very few cases where the formation of a hydrogen-bonded gas phase complex at room temperature could be quantitatively studied by infrared spectroscopy.<\/jats:p>","DOI":"10.1063\/1.2207617","type":"journal-article","created":{"date-parts":[[2006,6,13]],"date-time":"2006-06-13T22:19:11Z","timestamp":1150237151000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":61,"title":["Infrared spectroscopy of hydrogen-bonded CHCl3\u2013SO2 in the gas phase"],"prefix":"10.1063","volume":"124","author":[{"given":"Susan","family":"Chung","sequence":"first","affiliation":[{"name":"University of Sheffield Department of Chemistry, , Sheffield S3 7HF, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael","family":"Hippler","sequence":"additional","affiliation":[{"name":"University of Sheffield Department of Chemistry, , Sheffield S3 7HF, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2006,6,7]]},"reference":[{"key":"2023073022243727300_c1","volume-title":"The Hydrogen Bond","year":"1960"},{"key":"2023073022243727300_c2","volume-title":"Hydrogen Bonding by C\u2013H Groups","year":"1974"},{"key":"2023073022243727300_c3","doi-asserted-by":"publisher","first-page":"397","DOI":"10.1039\/cs9932200397","volume":"22","year":"1993","journal-title":"Chem. 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