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Reaction of o-phenylenediamine with diacetyl monoxime: characterisation of the product by solid-state 13C and 15N MAS NMR

✍ Scribed by T. Radhakrishnan; P. Sreekumari Nair; G. A. Kolawole; N. Revaprasadu; G. E. Hawkes; M. Motevalli; E. S. Bento; P. O'Brien

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
217 KB
Volume
45
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

2,3‐Dimethylquinoxaline (DMQ) and dimethylglyoxime (DMGH~2~) form a 1:1 hydrogen‐bonded complex in the solid state, which is completely dissociated in methanol solution. There are small differences in solid‐state ^13^C shifts between the separated components DMQ and DMGH~2~ and the complex. The changes in ^15^N solid‐state chemical shifts are more significant: the hydrogen bond imparting a low frequency shift of ca 19 ppm. The effect of direct protonation on the DMQ solid‐state ^15^N shifts was measured, and the experimental ^15^N data correlated with those from GIAO molecular orbital (MO) calculations. Copyright © 2007 John Wiley & Sons, Ltd.

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