Syntheses and electronic absorption spec
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Reda M. Abd El-Aal; Hassan A. Shindy; Ahmed Ibrahim M. Koraiem
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Article
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1997
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John Wiley and Sons
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English
โ 242 KB
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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