SOPPA and CCSD vibrational corrections to NMR indirect spin-spin coupling constants of small hydrocarbons

Publikation: Bidrag til tidsskriftKonferenceartikelForskningfagfællebedømt

We present zero-point vibrational corrections to the indirect nuclear spin-spin coupling constants in ethyne, ethene, cyclopropene and allene. The calculations have been carried out both at the level of the second order polarization propagator approximation (SOPPA) employing a new implementation in the DALTON program, at the density functional theory level with the B3LYP functional employing also the Dalton program and at the level of coupled cluster singles and doubles (CCSD) theory employing the implementation in the CFOUR program. Specialized coupling constant basis sets, aug-cc-pVTZ-J, have been employed in the calculations. We find that on average the SOPPA results for both the equilibrium geometry values and the zero-point vibrational corrections are in better agreement with the CCSD results than the corresponding B3LYP results. Furthermore we observed that the vibrational corrections are in the order of 5 Hz for the one-bond carbon-hydrogen couplings and about 1 Hz or smaller for the other couplings apart from the one-bond carbon-carbon coupling (11 Hz) and the twobond carbon-hydrogen coupling (4 Hz) in ethyne. However, not for all couplings lead the inclusion of zero-point vibrational corrections to better agreement with experiment.
OriginalsprogEngelsk
Artikelnummer090035
TidsskriftAIP Conference Proceedings
Vol/bind1702
Antal sider6
ISSN0094-243X
DOI
StatusUdgivet - 2015
BegivenhedInternational Conference of Computational Methods in Sciences and Engineering 2015: Computational Chemistry Symposium - Metropolitan Hotel-Conference Center, Athens, Grækenland
Varighed: 20 mar. 201523 mar. 2015

Konference

KonferenceInternational Conference of Computational Methods in Sciences and Engineering 2015
LokationMetropolitan Hotel-Conference Center
LandGrækenland
ByAthens
Periode20/03/201523/03/2015

ID: 132038206