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Aromatic methane dyes

Author:admin   AddTime:2021-09-28

Arylmethane dyes include diarylmethane, triarylmethane, diarylamine, and triarylamine dyes. In the classic arylmethane dye molecule (22), by increasing the number of conjugated olefinic bonds, λmx can be redshifted to the near-infrared region. The redshift ability of the spectrum mainly depends on the power supply ability of the substituents on the benzene end groups, and the redshift is generally 70-100m. In aryl methane dyes, introducing a current-attracting group (such as CN) on the central carbon atom and replacing the central carbon atom Amx with a more electronegative nitrogen atom will produce a corresponding red shift, such as dyes (22) (m=n =0, R1=R2=NMe2, R3=CN) Amx is 716nm, and dye (23) max=920nm. Inserting an ethynyl group in the conjugate system can expand the conjugate system and redshift the maximum absorption wavelength. The corresponding data can also be verified by the quantitative calculation of the PPP-MO method.



The dye molecule (24) has a strong spectral absorption band around 800nm, so it has received extensive attention in the field of optical data storage materials. The dye molecules of this structure have two absorption bands: the x-band in the near-infrared light and the y-band in the visible light region. When R2 in the dye is a current-absorbing group, Am will red shift. Dye components (25) are formed by replacing the carbon atoms on the benzene ring in the arylmethane dye molecules with heteroatom fragments. Compared with the unsubstituted dye molecules, they will cause the x-band to produce a red shift, usually 700~900nm. . In the dye molecule (26), the decrease of the electronegativity of the central atom can cause the red shift of the spectral absorption band. The PiccardJ theory foresees and discovers the research of near-infrared absorbing dyes starting from this type of dye. After years of research and development, these compounds have been widely used in the dye industry and functional dyes. Some of these dyes absorb in the visible light region, have low visible light transmittance, have poor light stability, and are easily decomposed at high temperature, which is not conducive to post-processing. Modification of the structure of this type of dye can improve its photothermal stability and make the λmx red shift larger. Therefore, after a lot of research on this type of dye, it is expected to be applied to laser protection and laser stealth materials.

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