The structure and interaction energies of the weak complexes of CHClF2 and CHF3 with HCCH: a test of density functional theory methods |
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Authors: | Vincent Mark A Hillier Ian H |
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Institution: | School of Chemistry, University of Manchester, Manchester M13 9PL, UK. |
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Abstract: | The structure and interaction energies of the weak non-covalent complexes of CHClF(2) and CHF(3) with HCCH have been predicted using a number of density functional based approaches, and compared with both high resolution spectroscopic data recently reported by Sexton et al. Phys. Chem. Chem. Phys., 2010, 12, 14263-14270], and with high level benchmark calculations reported herein. We find that this is another case where the M05 and M06 families of functionals, as well as the DFT-D approach, are competitive with the more costly wavefunction based methods. We highlight the problem of deriving unique intermolecular structural parameters from the experimental microwave data. |
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