Abstract
In this paper, 2,3,3-trimethyl-3H-indolin was synthesized by phenylhydrazine and 3-methyl-2-butanone as raw materials in the acetic acid reacted with different nitrogenalkylating reagents. Semi mono-cyanine dye and semi dicyanine dye were prepared with the help of squaric acid diethyl ester. The spectral properties of the target products were checked. The results show that compared with symmetrical squarylium mono-indocyanine dyes with the same substituent, the photo-stability of the bi-cyanine dyes were much better. When dissolved in water, the dye showed shorter maximum absorption wavelength, shorter maximum emission wavelength and shorter Stokes shift and apparent aggregation. In protic solvents, dye spectra showed a blue shift effect with an increase of solution polarity, while in aprotic solvents, dye spectrum showed a red shift with solution polarity increased. Among different solvents, the photostability of the dye in methanol is strongest.
Highlights
Cyanine dyes refer to a system featured with push-pull electronic connection, conjugating methyl dyne chain with N, O, S and other heteroatoms at both ends of the chromosphere, which are connected by conjugating methyl dyne chain links between each
The synthesis of indole acid cyanine dyes is the reaction between indole acid half-cyanine dyes and the corresponding indole quaternary ammonium salt
That is probably because in double cyanine dyes, two single cyanine dyes connected to butyl chain can be the base of each other, that help the introduction of the substituent with high space steric, which can hinder the attack of singlet oxygen or ultraoxygen anion, so the oxidation resistance and light stability of the dye are improved
Summary
Cyanine dyes refer to a system featured with push-pull electronic connection, conjugating methyl dyne chain with N, O, S and other heteroatoms at both ends of the chromosphere, which are connected by conjugating methyl dyne chain links between each This special kind of structure makes the dyes be able to emit fluorescence [1]. It is found that the cyanine dye itself has special spectral properties that traditional dyes do not have, such as superior molar extinction coefficient, broad absorption wavelength range, etc. It has been developed rapidly in various aspects in recent years
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