## Abstract Experimental solvent effects on ^13^C and ^17^O chemical shifts of acetone, and ^13^C chemical shifts of acetonitrile are compared with theoretical calculations by Jallali‐Heravi and Webb (solvaton model). Calculated values are, generally, in agreement with experimental results for atom
A theoretical study of solvent effects on the 13C chemical shifts of some polar molecules
✍ Scribed by M. Jallali-Heravi; G. A. Webb
- Publisher
- John Wiley and Sons
- Year
- 1980
- Tongue
- English
- Weight
- 271 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
Calculations of the dependence of ^13^C chemical shifts on the dielectric constant, ϵ, of the medium are reported using the INDO/S parameterized version of Pople's method together with the solvaton model. Satisfactory agreement with the available experimental data is obtained. The rather sensitive dependence of chemical shift upon ϵ suggests that polar solute—solvent interactions in aprotic media should be taken into account when considering ^13^C chemical shifts.
📜 SIMILAR VOLUMES
The dye molecule in a saturated hydrocarbon solvent (instead of the vacuum) is taken as reference state: the a-electrons of solute and solvent are treated as a continuous medium of dielectric constant E o = 2. The n-electrons of the solute are assumed to be immersed in this medium. Solvent shifts O:
In the present work, a theoretical analysis was carried out on the effect of the proximity of a polar bond to a polarizable bond on the magnetic shielding constants of the nuclei belonging to the polarizable bond. In particular, the case of 13 C magnetic shielding constants in a vinylic C C bond is
## Abstract Sum‐over‐states perturbation and finite perturbation calculations, within the ‘Solvaton’ model, are presented for the variation of some ^17^O and ^19^F chemical shifts as a function of the dielectric constant of the medium. In general, the nuclear screening and charge are predicted to i
## Abstract The synthesis and assignment of ^15^N and ^13^C NMR signals of the isoxazole ring in a series of __para__‐substituted 3‐phenyl derivatives are reported. DFT calculations of ^15^N and ^13^C chemical shifts are presented and compared to observed values. Substituent effects are interpreted
## Abstract GIAO/HF and DFT methods were utilized to predict the ^13^C chemical shifts of substituted ketenimines. GIAO HF/6–311+G(2d,p) and B3LYP/6–311+G(2d,p) methods were applied on the optimized B3LYP/6–31G(d) geometries and ^13^C chemical shifts of C~α~ and C~β~ of substituted ketenimines were