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Physikalisch-chemische Eigenschaften und Elektronenstruktur der Azo-Verbindungen. Teil X: Über die Protonierung der Azo-Gruppe in p′- oder m′-substituierten Derivaten des p-Dimethylamino-azobenzols

✍ Scribed by F. Gerson; E. Heilbronner

Publisher: John Wiley and Sons
Year: 1962
Tongue: German
Weight: 517 KB
Volume: 45
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.19620450107

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✦ Synopsis

Abstract

The absorption spectra and relative basicities of p‐dimethylamino‐azobenzene and of ten of its p′‐ or m′‐substituted derivatives have been determined. The bathochromic shift of the long‐wave π → π*‐transition on protonation of the azo link and the p__K__′~1~ values for this particular acid‐base equilibrium have been compared with the respective values found previously for correspondingly substituted phenylazoazulenes.

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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

✍ F. Gerson; E. Heilbronner 📂 Article 📅 1962 🏛 John Wiley and Sons 🌐 German ⚖ 510 KB

## 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