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A computational study of the structures of Van der Waals and hydrogen-bonded complexes of ethene and ethyne

✍ Scribed by H. Chuan Kang

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
443 KB
Volume
254
Category
Article
ISSN
0009-2614

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✦ Synopsis

The structures of the weakly bonded complexes X-C12 and X-HCI, where X is either C2H 4 or C2H2, are studied using density functional, hybrid density functional, Hartree-Fock and MP2 calculations. While most of the methods used give reasonable agreement with experimental data for bond lengths, the performance of the density functional methods for bond energy and distortion constants are not particularly satisfactory. The hybrid density functionals are less accurate for Van der Waals than for hydrogen-bonded complexes. Our results show that the softest normal modes in the complexes are not accurately treated at all by any of the density functional methods.

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