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Free radical dyes

Author:admin   AddTime:2021-09-29

Free radical dyes generally contain conjugated structures, and most of them show very dark colors. Most of these dyes are transition-state anions or cations formed during oxidation or reduction of organic compounds. In addition, it can also be obtained by ionizing different conjugated heterocycles or hydrocarbon systems. It includes free radical dyes such as polyenes, carotenoids, pyrenes and their derivatives, pyrroles, and porphyrin rings. The benzene ring or conjugated system with charge-absorbing group is easy to form anions, such as (18), (19), etc.; the charge-absorbing group is easy to form cations, such as (20), etc.; in addition, there are compounds with neutral radicals, such as (21) etc. Dongguan Irwin New Materials Electronics Division specializes in the development and research of absorbing materials.



Free radical dyes are usually unstable in the air, and the stability of substituted benzene rings, heterocyclic compounds and quinoid radical compounds is generally better. With the growth of the conjugated chain, the first absorption band of the absorption spectrum will have a definite red shift. The Mllr research team systematically studied the synthesis, electrochemical properties, near-infrared spectroscopy, electronic structure, etc. of near-infrared quinoid radical compounds, and found that the near-infrared absorption spectrum can cover the light region of 600-2000, and the molar absorption coefficient is 30-4.6. However, the absorption characteristic peak of the absorption spectrum is not strong, and there is considerable absorption in the visible light region.

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