The electncshieldmg tensor at nuclei III the molecules HzO, NH3, Cb and CO has been evaluated via coupled Hartree-Fock perturbation theory. The amrage trace of the shreldmg tensor 1s bnearly dependent on atomic electronegativities in the Isoelectronic senes Hz 0, NH3, C&.
LCAO Xα calculations of nuclear magnetic shielding in molecules
✍ Scribed by W. Bieger; G. Seifert; H. Eschrig; G. Grossmann
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 467 KB
- Volume
- 115
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
On the basis of the four-current density functional formalism. a method to calculate chemical shifts is developed, allowing the use of Xa wavefunctions in computations of magnetic properties of molecules First results of calculated nuclear magnetrc shielding constants and diamagnetic susceptibilities in small molecules using a LCAO Xa scheme within_a_minimal basis set are presented and compared with values obtained by CHF, UCHF, and FPT methods and with expernnent The CHF results show better agreement with experiment than our calculaQons, but our results are of the quality of UCHF data.
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