Helvetica Chimica Acta p. 989 - 995 (1981)
Update date:2022-08-22
Topics:
Geiger, Georg
Huber, J. Robert
Photodecomposition of dimethylnitrosamine in the gas phase ( 1 Torr) has been investigated following irradiation into the S1(n?*) <- S0(363.5 nm) and S2(??'*) <- S0(248.1 nm) transitions at room temperature.With a quantum yield of unity, excitation into the S1 state yields the fragments (CH3)2N and NO which then recombine leaving no photoproducts.The addition of O2 results in only one photoproduct, (CH3)2NNO2.Irradiating into the S2 state, the products CH2=N-CH3, (CH2=N-CH3)3, CH2=NOH, N2O, NO, H2, and N2 were identified by capillary gas chromatography mass spectrometry.In the presence of N2 as a buffer gas the photoproducts are only CH2=N-CH3, (CH2=N-CH3)3, N2O, and H2.For both excitation conditions a mechanism is proposed involving cleavage of the N,N-bond as the main primary photolytic process.
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