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Lookup NU author(s): Dr Su Stephens,
Dr Nick Walker,
Professor Anthony Legon
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An isolated complex of C2H4 and ICF3 has been generated in the gas phase and studied by chirped-pulse. Fourier transform microwave (CP-FTMW) spectroscopy. Ab initio calculations at the CCSD(T)(F12*)/VTZ level support the experimental work and further establish the dissociation energy, D-e, and dipole moment, mu, of the complex. Rotational constants, B-0 and C-0, the centrifugal distortion constant, Delta(J), nuclear quadrupole coupling constants. chi(aa)(I) and (chi(bb)(I)-chi(cc)(I)) and the nuclear spin-rotation coupling constant C-bb(1) of the complex are determined from the experimental data. The iodine atom interacts with pi-electrons on C2H4 resulting in the formation of a linear (angle(C-I...*)) halogen bond (where * indicates the centre of the C=C bond) and a complex of Cs symmetry. The measured rotational constants allow the length of the halogen bond to be determined as 3.434(2) angstrom in the r(0) geometry. The complex is formally an asymmetric top but with a very low barrier to internal rotation of C2H4 about the C-3 axis defined by the CF3I sub-unit. Adopting an approach also used in a recent study of H2O...ICF3, other transitions are assigned using the Hamiltonian of a symmetric top molecule. (C) 2012 Elsevier Inc. All rights reserved.
Author(s): Stephens SL, Mizukami W, Tew DP, Walker NR, Legon AC
Publication type: Article
Publication status: Published
Journal: Journal of Molecular Spectroscopy
Print publication date: 11/06/2012
ISSN (print): 0022-2852
ISSN (electronic): 1096-083X
Publisher: Academic Press
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