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OBSERVATION OF C$-$H${\cdots}$$\pi$ INTERACTIONS: MICROWAVE SPECTRA AND STRUCTURES OF THE CH$_{2}$FX${\cdots}$HCCH (X=F,Cl) WEAKLY BOUND COMPLEXES

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/49300

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Title: OBSERVATION OF C$-$H${\cdots}$$\pi$ INTERACTIONS: MICROWAVE SPECTRA AND STRUCTURES OF THE CH$_{2}$FX${\cdots}$HCCH (X=F,Cl) WEAKLY BOUND COMPLEXES
Creators: Elmuti, Lena F.; Obenchain, Daniel A.; Jurkowski, Don L.; Sanders, Amelia J.; Peebles, Rebecca A.; Peebles, Sean A.; Steber, Amanda L.; Neill, Justin L.; Pate, Brooks H.
Issue Date: 2011
Abstract: With an interest in characterizing C$-$H${\cdots}$$\pi$ interactions, CH$_{2}$F$_{2}{\cdots}$HCCH and CH$_{2}$ClF${\cdots}$HCCH have been examined by Fourier-transform microwave (FTMW) spectroscopy. These interactions involve the $\pi$ bond in acetylene acting as a hydrogen bond acceptor to both hydrogen atoms of CH$_{2}$FX. In addition, there is a secondary contact between one hydrogen atom from acetylene and the X atom in the halomethane (X=F in CH$_{2}$F$_{2}$, X=Cl in CH$_{2}$ClF). \ Initial assignments for the most abundant isotopologues of both species were completed using the chirped-pulse FTMW \hbox{spectrometers} at the University of Virginia (CH$_{2}$ClF${\cdots}$HCCH) and at Eastern Illinois University (CH$_{2}$F$_{2}$${\cdots}$HCCH). Rotational constants \hbox{obtained} from experiment are in good agreement with those of the most stable orientations predicted by ab initio calculations at the \hbox{MP2/6-311++G(2d,2p)} level. Multiple isotopically substituted species for each complex were measured using a Balle-Flygare \hbox{cavity } FTMW spectrometer at Eastern Illinois University. Spectroscopic parameters for all observed isotopologues will be presented, and a comparison of the C$-$H$\cdots\pi$ interactions in these and related complexes will be discussed.
URI: http://hdl.handle.net/1811/49300
Other Identifiers: 2011-RC-12
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