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1,2,3-Triazabutadiene. XIII. UV-vis-spektroskopische Untersuchungen zur Protonierung Z-E-isomerer 1-Aryl-3-[3-methylbenzthiazolinyliden-(2)]- und 1-Aryl-3-[1,3-dimethylbenzimidazolinyliden-(2)]-triazene

✍ Scribed by Prof. Dr. E. Fanghänel; Dr. J. Hohlfeld

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
408 KB
Volume
323
Category
Article
ISSN
1615-4150

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✦ Synopsis

1,2,3‐Triazabutadienes. XIII. U.V.‐vis‐Spectroscopic Investigations of the Protonation of Z‐E‐Isomeric 1‐Aryl‐3‐[3‐methylbenzthiazolinyliden‐(2)]‐ and 1‐Aryl‐3‐[1,3‐dimethylbenzimidazolinyliden‐(2)]‐triazenes

The u.v.‐vis absorption spectra of Z‐E‐isomeric 1‐aryl‐3‐[3‐methylbenzthiazolinyliden‐(2)]‐ and 1‐aryl‐3‐[1,3‐dimethyl‐benzimidazolinyliden‐(2)]‐triazenes 1–3 resp. 4 show a pronounced halochromic effect in the presence of acids. The reason is the protonation of the N^1^‐atom of the triazabutadiene chain whereby the energetically favourable structure of a diazatrimethine is formed. The magnitude of the halochromic effect depends on the substituents in the aryl and benzo residue and on the Z‐E‐structure of the compounds.

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