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Physikalisch-chemische Eigenschaften und Elektronenstruktur der Azo-Verbindungen. Teil XI: Bemerkung zur Struktur des Azonium-Kations des p,p′-Bis-dimethylamino-azobenzols

✍ Scribed by F. Gerson; E. Heilbronner

Publisher
John Wiley and Sons
Year
1962
Tongue
German
Weight
510 KB
Volume
45
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

The absorption spectrum of p,p′‐bis‐dimethylamino‐azobenzene has been measured in solvents of different acidities. The bathochromic shift of the long‐wave transition associated with protonation of the azo link falls in line with the corresponding shifts, observed for a series of p′‐substituted p‐dimethylamino‐azobenzenes. The same is true – inside wider limits of error – for the p__K__′ values of the equilibrium: base + H^⊕^ ⇆ azonium‐cation of these compounds. These results support the view that protonation of p,p′‐bis‐dimethylamino‐azobenzene does not differ in principle from that of the unsymmetric p′‐substituted p‐dimethylaminoazobenzenes.

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