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cyanine dyes definition

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Synthetic dyes with the general formula R2N[CH=CH]nCH=N+R2 R2N+=CH[CH=CH]nNR2 (n is a small number) in which the nitrogen and part of the conjugated chain usually form part of a heterocyclic system, such as imidazole, pyridine, pyrrole, quinoline and thiazole. E.g.

F. M. Hamer, The Cyanine Dyes and Related Compounds, Interscience, 1964.


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