title: Reaction of o-phenylenediamine with diacetyl monoxime: characterisation of the product by solid-state 13C and 15N MAS NMR.
abstract: 2,3-dimethylquinoxaline (DMQ) and dimethylglyoxime (DMGH2) 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 13C shifts between the separated components DMQ and DMGH2 and the complex. The changes in 15N 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 15N shifts was measured, and the experimental 15N data correlated with those from GIAO molecular orbital (MO) calculations.
authors.affiliation: Department of Chemistry, University of Zululand, Private Bag X1001, Kwadlangezwa 3886, Kwa Zulu Natal, Republic of South Africa.
authors.forename: T
authors.initials: T
authors.lastname: Radhakrishnan
authors.forename: P
authors.initials: P
authors.lastname: Sreekumari Nair
authors.forename: G A
authors.initials: GA
authors.lastname: Kolawole
authors.forename: N
authors.initials: N
authors.lastname: Revaprasadu
authors.forename: G E
authors.initials: GE
authors.lastname: Hawkes
authors.forename: M
authors.initials: M
authors.lastname: Motevalli
authors.forename: E S
authors.initials: ES
authors.lastname: Bento
authors.forename: P
authors.initials: P
authors.lastname: O'Brien