Dicyanmethylen-acenaphthenon-hydrazone — Polymethine mit dem Amino-dicyanallylidenimin-Chromophor

Acenaphthenequinone reacts with malononitrile and asymm. substituted hydrazines to deeply coloured 2-dicyanomethylene-1-acenaphthenone-hydrazones. They are classified as aza-cyanine type polymethine dyes with the amino-dicyanoallylidenimide chromophore.