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Structure of the chlorobenzene-argon dimer: Microwave spectrum and ab initio analysis

Authors
Oh, JJPark, IWilson, RJPeebles, SAKuczkowski, RLKraka, ECremer, D
Issue Date
Nov-2000
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF CHEMICAL PHYSICS, v.113, no.20, pp.9051 - 9059
Journal Title
JOURNAL OF CHEMICAL PHYSICS
Volume
113
Number
20
Start Page
9051
End Page
9059
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/16726
DOI
10.1063/1.1319997
ISSN
0021-9606
Abstract
The rotational spectra of the Cl-35 and Cl-37 isotopes of the chlorobenzene-argon van der Waals dimer have been assigned using Fourier transform microwave spectroscopy techniques. Rotational constants and chlorine nuclear quadrupole coupling constants were determined which confirm that the complex has C-s symmetry. The argon is over the aromatic ring, shifted from a position above the geometrical ring center towards the substituted carbon atom, and at a distance of about 3.68 Angstrom from it. This distance is 0.1-0.2 Angstrom shorter than the similar distance in the benzene-argon and fluorobenzene-argon complexes. Experimental results are confirmed and explained with the help of second-order Moller-Plesset perturbation calculations using a VDZP+diff basis set. The complex binding energy of the chlorobenzene-argon complex is 1.28 kcal/mol (fluorobenzene-argon, 1.17; benzene-argon, 1.12 kcal/mol) reflecting an increase in stability caused by larger dispersion interactions when replacing one benzene H atom by F or by Cl. The structure and stability of Ar .C6H5-X complexes are explained in terms of a balance between stabilizing dispersion and destabilizing exchange repulsion interactions between the monomers. (C) 2000 American Institute of Physics. [S0021-9606(00)01644-5].
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