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Synthesis and electronic spectra of some bis-heterocyclic methine cyanine dyes

โœ Scribed by A.I.M. Koraiem; Kh.M. Hassan; R.M.Abd el All


Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
598 KB
Volume
13
Category
Article
ISSN
0143-7208

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Syntheses and electronic absorption spec
โœ Reda M. Abd El-Aal; Hassan A. Shindy; Ahmed Ibrahim M. Koraiem ๐Ÿ“‚ Article ๐Ÿ“… 1997 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 242 KB ๐Ÿ‘ 2 views

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