Redox-responsive color-changing rare earth supramolecular gel fluorescent material and its preparation

Abstract

The invention belongs to the field of functional materials, and more particularly relates to a redox-responsive color-changing rare earth supramolecular gel fluorescent material and a preparation method thereof. The redox-responsive color-changing rare earth supramolecular gel fluorescent material is prepared by mixing a mixed solution of an aqueous solution containing rare earth ion europium ionsand alkali liquor with an organic solution containing gel factor 3,5-dinitrosalicylic acid. Under alkaline conditions, the rare earth supramolecular gel fluorescent material is self-assembled by utilizing the coordination effect of the gel factor 3,5-dinitrosalicylic acid and rare earth ion europium ions and the PI-PI interaction of benzene rings of the 3,5-dinitrosalicylic acid. The gel formed has unique fluorescence characteristics of the rare earth ions, good luminous intensity and high fluorescence efficiency, and the excitation spectrum is located in a visible light region and has stronganti-interference capability. The rare earth supramolecular gel has redox responsiveness, simple and rapid preparation process, no need of heating treatment, and easily available gel factor, and therare earth supramolecular gel material has better application prospect in the high-end anti-counterfeiting field.

Description

technical field [0001] The invention belongs to the field of functional materials, and more specifically relates to a redox-responsive color-changing rare earth supramolecular gel fluorescent material and its preparation. Background technique [0002] Rare earth fluorescent supramolecular gel, as a new type of soft matter material, is formed by self-assembly of rare earth ions and gelling factors based on metal coordination bonds and non-covalent bonds. Due to its unique optical properties of rare earth ions and the responsiveness of supramolecular gels, this type of material is widely used in anti-counterfeiting, sensors, biomedicine and other fields. [0003] However, the excitation spectra of rare earth fluorescent supramolecular gels reported so far are mostly in the ultraviolet region, and their penetration is poor, so their application in the biological field is limited; and the responsiveness of such materials is mostly temperature, pH and ion responsiveness. However...

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a redox-responsive color-changing rare earth supramolecular gel fluorescent material and its preparation, which is a mixed solution of aqueous solution containing rare earth ion europium ion and alkaline solution It is prepared by mixing with an organic solution containing gel factor 3,5-dinitrosalicylic acid; under alkaline conditions, it utilizes the coordination of gel factor 3,5-dinitrosalicylic acid and rare earth ion europium ion Site interaction and π-π interaction self-assembly of the phenyl ring of 3,5-dinitrosalicylic acid to form the rare earth supramolecular gel fluorescent material, thereby solving the problem that the existing rare earth supramolecular gel has no redox responsiveness , preparation of complex technical issues

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