Linewidth variation in the dinitronitrosomethyl dianion radical in the slow exchange mode

✍ Scribed by Glen A. Russell; Robert K. Norris

• Publisher: John Wiley and Sons
• Year: 1970
• Tongue: English
• Weight: 321 KB
• Volume: 2
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.1270020610

✦ Synopsis

Abstract

The treatment of nitromethane or dinitromethane in aqueous alkaline solutions (1 to 2·5 M hydroxide) with nitrogen dioxide yields the dianion radical of dinitronitrosomethane [C(NO~2~)~2~(NO)\documentclass{article}\pagestyle{empty}\begin{document}$ \buildrel\textstyle.\over= $\end{document}] which at 30° has hfsc of a = 10·75 and 0·65 and a~N~^NO^ = 5·80 g. Restricted rotation about the CNO bond causes magnetic non‐equivalence of the two nitro groups which can slowly exchange giving rise to line broadening. The use of ^15^N labeled nitrogen dioxide gave the dianion radical
which exists in two equally populated conformations, each of which shows the expected line broadening for a ‘slow exchange’ process in which the nitro groups are being interconverted.