The He(I) photoelectron (p.e.) spectra of azuleno[2,1-c] pyridine (1) and azuleno[1,2-c]pyridine (2), which are iso-π-electron systems of benz[a]azulene, have been measured. To aid the interpretation of the p.e. spectra semiempirical molecular-orbital calculations have been performed. The ionization transitions from the lone-pair orbitals have been assigned as 9.06 and 9.00 eV for (1) and (2), respectively.
H. Yamaguchi, M. Higashi, K. Fujimori and T. Kobayashi, J. Chem. Soc., Faraday Trans. 2, 1989, 85, 157 DOI: 10.1039/F29898500157
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