Infrared Spectra and ab initio Calculations for Fluoride-acetylene Clusters: F–-(HCCH)n, n = 3–6
Duncan A. Wild A D , Zoë M. Loh B and Evan J. Bieske CA School of Biomedical, Biomolecular, and Chemical Sciences, The University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia.
B CSIRO Marine & Atmospheric Research/Centre for Australian Weather and Climate Research, PMB1, Aspendale, Vic. 3195, Australia.
C School of Chemistry, University of Melbourne, Parkville, Vic. 3010, Australia.
D Corresponding author. Email: duncan.wild@uwa.edu.au
Australian Journal of Chemistry 64(5) 633-637 https://doi.org/10.1071/CH11032
Submitted: 18 January 2011 Accepted: 11 February 2011 Published: 30 May 2011
Abstract
Infrared spectra and ab initio calculations are presented for gas phase clusters consisting of a fluoride anion attached to acetylene ligands. Spectra obtained in the C-H stretch region contain a single strong band, consistent with cluster structures in which roughly equivalent acetylene ligands are hydrogen bonded to a central fluoride anion core. Minimum energy structures predicted from ab initio calculations at the MP2 level of theory are highly symmetric with acetylene ligands equally spaced about a central fluoride anion core. The predicted H-bonded C-H stretching frequencies, after scaling to correct for anharmonicity, agree well with the experimental band positions.
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