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Syntheses and absorption spectra of new azo dyes containing an azulene ring

โœ Scribed by Koichi Takagi; Akira Mizuno; Hitoshi Iwamoto; Seigo Kawashima; Sohei Nishida; Tomoko Hashikawa; Tetsuo Nozoe


Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
475 KB
Volume
26
Category
Article
ISSN
0143-7208

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The reaction of a ratio of 1 mole of 5-chloro-3-methyl-1-phenyl pyrazolo-4[2(4)]-dimethine cyanine (1a,b) or (5-chloro-4-formyl-3-methyl-1-phenylpyrazole) 2 with 2 moles of an appropriate 2(4)-heterocyclic quaternary salt afforded the novel pentamethine cyanine dyes (3a-3e). Other reactions of 2 wit