Application of amphoteric side chain-containing fluorescent conjugated polyelectrolyte

Abstract

The present invention discloses an application of an amphoteric side chain-containing fluorescent conjugated polyelectrolyte. With application of the amphoteric side chain-containing fluorescent conjugated polyelectrolyte as a fluorescent sensing system, the application method comprises: (1) mixing water and an organic solvent to prepare a mixed solvent, wherein the volume concentration of the water is 0.1-99.9%, (2) adding an amphoteric side chain-containing fluorescent conjugated polyelectrolyte to the mixed solvent, wherein the concentration of the amphoteric side chain-containing fluorescent conjugated polyelectrolyte in the mixed solvent is 1-10 muM, and (3) under excitation of light with a wavelength of 400-430 nm, measuring intensity and a wavelength of the emission spectrum of the mixed solvent, wherein the organic solvent is one of tetrahydrofuran, dimethyl sulfoxide and N,N-dimethyl formamide. According to the present invention, the amphoteric side chain-containing fluorescent conjugated polyelectrolyte has different fluorescence luminescence performances in the water and organic solvent mixed solvents with different ratios, and provides sensing response for the specific substance, such that the amphoteric side chain-containing fluorescent conjugated polyelectrolyte can be used as the high sensitivity sensing system in the water and organic solvent mixed solution, and has application prospects.

Description

technical field [0001] The invention relates to a fluorescent conjugated polymer and its preparation technology, in particular to a fluorescent conjugated polyelectrolyte containing amphoteric side chains, its preparation and application, and belongs to the field of fluorescent chemical sensing materials. Background technique [0002] In terms of fluorescent sensing materials, fluorescent small molecules have been widely studied as chemical sensors in the past few decades. Compared with small molecular materials, polymer materials have many advantages, such as the strength, stability, and structural adjustability of materials. In practical applications, the small molecule sensing material should eventually be embedded in the polymer matrix, or the small molecule fluorophore and sensing receptors should be introduced into the polymer side chain, and the polymer main chain mainly acts as a scaffold. [0003] Conjugated polymers are sometimes called conductive polymers or molec...

AI Technical Summary

Problems solved by technology

These conjugated polyelectrolytes mainly exist in the form of aggregation in the water environment, which strengthens the electron and energy transfer between molecules, thus affecting its luminescence performance and sensing efficiency.

Due to the strong π-π relationship between the conjugated main chains of polyelectrolytes * interaction, it is difficult to destroy π-π after drying * The interaction makes it redissolve, so it can only be stored in solution, which brings difficulties to storage and transportation

The aggregation of fluorescent conjugated polyelectrolytes also has a self-quenching effect on the fluorescence of the conjugated polymer itself, which reduces the quantum efficiency of the conjugated polymer ( CHEM. COMMUN. , 2002, 446–447)

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