Polymethine Dyes with Light Absorption in the Near Infrared. There is a currently significant interest in days that absorb in the near infrared (NIR) region, These compounds are mainly used as laser days and photoreceptors of photodiode lasers. Many NIR dyes are of polymethinic structure such as polymethine cyanines and polymethine violenes. Knowledge about structure‐color relationships enables dyes of appropriate absorption features to be predicted.
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Jürgen Fabian (1991) studied this question.
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