ISSN:
0749-1581
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Carbon-13 NMR spectra of some solid substituted anilines and aromatic diazonium salts, taken under conditions of cross-polarization with high-power proton decoupling, are presented. In the case of the aromatic diazo compounds the carbon directly attached to the diazo group gives rise at 22.6 MHz to a line shape which has approximately the appearance of a 2:1:1 triplet but which is shown to be in reality a 2:1 doublet of 2:1 doublets. This arises from the presence of both a long-range and a short-range residual (13C, 14N) dipolar coupling. Isotopic labelling of the nitrogen in the diazo group allowed the determination of the nuclear quadrupole coupling constants of the two 14N nuclei and, consequently, theoretical simulation of the apparent triplet line shape. The orientations of the electric field gradient tensors for the 14N nuclei in these compounds are discussed in terms of their electronic structure.
Additional Material:
19 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260230716
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