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Spectrochim Acta A Mol Biomol Spectrosc. 2018 Mar 15;193:447-450. doi: 10.1016/j.saa.2017.12.062. Epub 2017 Dec 21.

Rotational study on the van der Waals complex 1-chloro-1,1-difluoroethane-argon.

Author information

1
Department of Chemistry, School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, 401331 Chongqing, China.
2
Department of Chemistry, School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, 401331 Chongqing, China. Electronic address: qian.gou@cqu.edu.cn.

Abstract

The rotational spectrum of the van der Waals complex formed between 1-chloro-1,1-difluoroethane and argon has been investigated by using a pulsed jet Fourier transform microwave spectrometer. Only one set of rotational transitions belonging to the lowest energy conformer has been observed and assigned, although theoretical calculations suggest six stable conformers that might be observed. The observed conformer, according to the experimental evidence from two isotopologues (35Cl and 37Cl), adopts a configuration in which the argon atom is located, close to the CF2Cl top, between the CCF and CCCl planes (the dihedral angle ∠ArCCCl is 65.2°). The distance between argon atom and the center of mass of CH3CF2Cl is 3.949(2) Å. The dissociation energy, with pseudo diatomic approximation, is evaluated to be 2.4kJmol-1.

KEYWORDS:

Argon; Freon; Pulsed jet; Rotational spectroscopy; Van der Waals interaction

PMID:
29287280
DOI:
10.1016/j.saa.2017.12.062

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