Fluorescence conjugated polyelectrolytes with amphoteric side chain, preparation method and application

Abstract

The invention discloses a fluorescence conjugated polyelectrolytes and a preparation technology thereof, in particular to a fluorescence conjugated polyelectrolytes with an amphoteric side chain and a preparation method thereof, which is applied to the field of fluorescent chemical sensing materials. The structure of the fluorescence conjugated polyelectrolytes with the amphoteric side chain contains an OCnH2n+1 oleophylic side chain and an ionic type oleophylic side chain simultaneously, wherein the ionic type oleophylic side chain contains ammonium salt or sulphonate. The fluorescence conjugated polyelectrolytes with the amphoteric side chain is prepared by comprising the following steps: mixing oil-soluble monomers and water-soluble monomers in molar ratio of 1-1.12:1, adding catalyst tetrakis-(triphenylphosphine)-palladium and cuprous iodide, and carrying out coupling reaction, wherein the ratio of the catalyst tetrakis-(triphenylphosphine)-palladium to the oil-soluble monomers is 1:0.0.5-0.08, and the ratio of the cuprous iodide to the oil-soluble monomers is 1:0.05-0.08. The substance has different fluorescence luminous performance in the mixed solvent of the water and organic solvent in different proportion and has sensing response for a specific substance, thereby serving as a high-sensitive sensing system in the mixed solvent of the water and the organic solvent and having an application prospect.

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...

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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* interaction between the conjugated main chains, it is difficult to destroy the π-π* interaction and redissolve the polyelectrolyte after drying, so it can only be stored in solution. transport presents difficulties

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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