Elektronenstruktur und physikalisch‐chemische Eigenschaften von Azo‐Verbindungen. Teil XIV: Die Konformation des Benzalanilins

Abstract

Abstract A re‐evaluation of the electronic spectra of benzalaniline (II), 3, 3‐dimethyl‐2‐phenyl‐indolenine (X), mono‐aryl substituted azomethines (XI, XIV, XV) and trimethylindolenine (XII) as well as of their conjugate acids strongly supports the hypothesis of I SMAILSKI & S MIRNOV [14] and of E BARA [15] that benzalaniline exists in a preferred peri‐perpendicular conformation. The same is true for N‐phenylazomethines. The n → π* transition of a ‘planar benzalaniline’ has been located at 27 600 cm −1 (ε ≈ 60).