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 Title: Rotational Spectra Of Adducts Of Pyridine With Methane And Its Halides Author(s): Gou, Qian Contributor(s): Caminati, Walther; Cocinero, Emilio J.; Lesarri, Alberto; Vallejo-López, Montserrat; Spada, Lorenzo Subject(s): Clusters/Complexes Abstract: The rotational spectra of the 1:1 complexes of pyridine (PYR) with methane and its halides have been observed and assigned using pulsed jet Fourier transform microwave technique. Depending on the nature of the chemical species linked to PYR, $\pi$ or $\sigma$ type complexes have been observed, in relation to the PYR interaction sites, that is the $\sigma$ system of the aromatic ring, or the n orbital of the nitrogen atom. In the case of PYR-\chem{CF_4}, where the two subunits are held together by a CF$_{3}$•••N halogen bond, with the top undergoing a free rotation with respect to PYR [1]. Instead, a C-Cl•••N halogen bond characterizes PYR-\chem{CF_3Cl}. In PYR with \chem{CHF_3} [2], \chem{CH_3F} and \chem{CH_2F_2} two kind of weak hydrogen bonds, C-H•••N and C-H•••F, have been found to connect the two constituent units. The barriers to the internal rotations of the \chem{CHF_3} and of the \chem{CH_3F} groups have been determined from the A-E splittings of the rotational transitions. The rotational spectrum of the adduct PYR-\chem{CH_4} shows that \chem{CH_4} links to an aromatic molecule through a C H•••$\pi$ weak hydrogen bond. The shape and the internal dynamic behavior of this complex are very similar to that of the van der Waals complexes involving aromatic molecules with rare gases, which would suggest classifying \chem{CH_4}, in relation to its ability to form molecular complexes with aromatic molecules, as a pseudo rare gas. References: [1] A. Maris, L. B. Favero, B. Velino, W. Caminati, J. Phys. Chem. A, 2013, 117, 11289. [2] L. B. Favero, B. M. Giuliano, A. Maris, S. Melandri, P. Ottaviani, B. Velino, W. Caminati, Chem. Eur. J. 2010, 16, 1761. Issue Date: 2014-06-19 Publisher: International Symposium on Molecular Spectroscopy Citation Info: Gou, Q.; Caminati, W.; Cocinero, E.J.; Lesarri, A.; Vallejo-López, M.; Spada, L. ROTATIONAL SPECTRA OF ADDUCTS OF PYRIDINE WITH METHANE AND ITS HALIDES. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.RB05 Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/51165 DOI: https://doi.org/10.15278/isms.2014.RB05 Rights Information: Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/ Date Available in IDEALS: 2014-09-172015-04-14
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