Azomethane, spectroscopy

Very high pressure (1-200 bar) room temperature data have been obtained by Hippier et al. [61] by following the [CH3] produced by the photolysis of azomethane with UV absorption spectroscopy. The agreement with the data of McPherson et al. [58] is excellent and shows no pressure dependence between 1 and 10 bar. Thereafter there is a slight decrease in the rate due to the onset of diffusion limited kinetics. 

NO on the basis of NMR and IR spectroscopy. At low temperatures, an unstable complex with /no at 1670 cm S assigned to the bent nitrosyl of (39), was observed. By monitoring the NMR spectrum at room temperature, researchers observed a signal they assigned to the N-methyl group of (40), and rj -nitrosomethane complexes have been isolated and structurally characterized (21 i). This complex then decomposes, either by a binuclear mechanism or by unimolecular elimination of methylnitrene, to give azomethane and the resulting oxocomplex (41). 

From PE spectroscopy results for azomethane (Haselbach and Heilbron-ner, 1970) the energy of the n MO is known to lie between those of the n + and n orbitals. Thus, a HOMO-LUMO crossing results and the trans-cis... 

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