Photoelectron spectra and electronic structures of 2-alkoxy-1-tert-alkyldiazen-1-oxides and 1-alkoxy- 3,3 -dialkyltriazen-2 -oxides
作者:Mikhail A. Kuznetsov、Yuliya P. Artsybasheva、Boris V. Ioffe、Paul Rademacher、Michael Woydt
DOI:10.1016/0022-2860(91)80075-f
日期:1991.12
The electronic structures of 2-alkoxy-1-tert-alkyldiazen-1-oxides (1b-e) and 1-alkoxy-3,3-dialkyltriazen-2-oxides (2a-c) have been studied by photoelectron spectroscopy and semiempirical quantum chemical calculations. It was shown that n-pi conjugation in such "pi-electron over-crowded" compounds is rather uneffective. As a result, the presence of the alkoxy groups in 1 and the dialkylamino groups in the cross-conjugated system 2 lead only to minor perturbations of the n- and pi-type orbitals of the diazenoxide moiety. The HOMOs of 1 and 2 are pi-type orbitals localized essentially on the atoms of the diazenoxide fragment. The second (in 1) or third (in 2) highest occupied MOs are n-type orbitals localized on the oxide oxygen atom.