Ab initio GIAO CPHF calculations on the NMR chemical shifts of the noble gas guests in the He@&,, Ne@Cso, He&&g,-, He@& and HeaCT endohedral complexes are reported. Changes in shifts experienced by the guests upon encagement are found to be sensitive to the host geometries but only weakly dependent
GIAO studies of magnetic shielding in FHF- and HF
✍ Scribed by Robert Ditchfield
- Publisher
- Elsevier Science
- Year
- 1976
- Tongue
- English
- Weight
- 385 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Proton and fluorine magnetic shielding tensors are calculated for FHF-and HF using coupled Hartrec-Fock (CHF) the ory with gauge-invariant atomic orbitals (CIAO). The theoretical value of the hydrogen bond shift in FHF'-determined from slightly extended basis set studies is in good agreement with experimental results. Thus a recent suzestion that the CIAO CHF approach will suffer from the same deficiencies as the ordinary CHF method for the FHF-ion does not appear to be COrieCt.
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