A semi-empirical investigation of the annulenes

The Low‐Temperature UV/VIS Absorption Spectrum of [14]Annulene

“…This UVjVIS spectrum was interpreted by Blattniann et al [4]: on the basis of a PPP calculation, these authors demonstrated the correlation existing between the reported transitions of [14]annulene and those of benzene and of [18]annulene. One year later, TrinajstiC and Wratten [5] considered the agreement between the theoretical and experimental spectrum of the title compound as very poor, stating that this poor agreement 'indicates that the PPP method may not be applicable to this important class of conjugated molecules' [5]. They were led to such a conclusion due to their ignorance of the existence of a transition at ca.…”