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Effects of solute–solvent interactions on the nitrogen nuclear shieldings of some alkyl cyanides

✍ Scribed by M. Witanowski; W. Sicinska; G. A. Webb

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
520 KB
Volume
27
Category
Article
ISSN
0749-1581

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✦ Synopsis

It was found that the range of solvent effects on the nitrogen NMR shielding of the cyano group appears to he almost independent of the nature of the attached alkyl group and to be in excess of 20 ppm. Effects due to both the polarity of the medium and hydrogen bonding are observed to contribute almost equally to the nitrogen shielding ranges measured for four alkyl cyanides. These contributions are determined from the shielding in nitrogen variations with the solvent by means of a four-parameter model and are supported by molecular orbital calculations employing the solvaton description of non-specific solutesolvent interactions. The observed responses of the nitrogen shieldings to solvent effects are found to he significantly different from those reported for sp2-type nitrogen atoms.

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