Abstract
In the review on "Cyanine Dyes Containing Quinoline Moieties: History, Synthesis, Optical Properties and Applications" (K. Ilina, M. Henary, Chem Eur. J. 2021, 27, 2430; https://doi.org/10.1002/chem.202003697), some essential aspects were incorrectly described and discussed. To avoid further confusion, this correspondence tries to clarify both the structures and the history of some cyanine and apocyanine dyes that were not presented sufficiently.
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