Theoretical calculation of 13C chemical shielding anisotropy in some organic compounds
โ Scribed by Isao Ando; Atsuo Nishioka; Masahiro Kondo
- Publisher
- Elsevier Science
- Year
- 1974
- Tongue
- English
- Weight
- 331 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
The 13C chemical shielding anisotropies of benzene, toluene, he~~e~yl~a~ne and acetone molecules are calculated theoretically by a linear combination of gauge invariant atomic orbitals -molecular orbital theory using the MIND0 method.
๐ SIMILAR VOLUMES
Hi& resolution 13C and l5 N NMR spectra fiave been obtained for powdered C&CN. The presence of resolved dip&r structure in the ' 3 C spectra permits the cancIusion that the symmetry axis of the \* 3C shielding tensor lies
The principal elements of the axially symmetric nitrile ~3C chemical shift tensor, and the C-=N bond distance of solid CH3CN have been determined from both static and sample spinning NMR experiments at 78 and 140 K. The spectra show no significant differences between the a and /3 forms of the solid
## Abstract Calculations based on Pople's independent electron model, with CNDO/S and INDO/S parameterizations, are reported for some ketenimines and carbodiimides. The unusually large shielding of the central carbon uncleus is accounted for by means of the various electronic transitions which cont