Heterocyclisch substituierte Arendiazoniumsalze mit erweiterter spektraler Empfindlichkeit. II. 4-(1-Heterocycliden-2,3-diaza-prop-2-en-3-yl)-benzendia-zoniumtetrafluoroborate
✍ Scribed by Prof. Dr. E. Fanghänel; Dr. C. K. J. Tschötsch; Dr. A. M. Richter
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 611 KB
- Volume
- 332
- Category
- Article
- ISSN
- 1615-4150
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✦ Synopsis
Heterocyclic Substituted Arenediazonium Salts with a Long‐wave‐length Range of Sensitivity. II. 4‐(1‐Heterocycliden‐2,3‐diaza‐prop‐2‐en‐3‐yl)‐arenediazonium tetrafluoroborates
The title compounds (3) are obtained by reaction of aromatic bis‐diazonium salts with substituted 2‐benzylidene‐1,3‐dithioles and 2‐benzylidene‐1,3‐diselenole, respectively. The maximum of the long wave‐length absorption band of 3 varies from 580 nm up to 665 nm depending on the structure of the compound.
The quantum yields of the photolysis of the diazonium salts 3 are low (1 · 10^−4^ to 7 · 10^−3^). The azo dyes obtained from 3 with usual azo‐couplers absorb in a shorter wave‐length range than the corresponding diazonium salts themselves (hypso‐coupling effect).