Fluorescent color changing eutectic material under ultrahigh pressure conditions and preparation method thereof
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A eutectic material, ultra-high pressure technology, applied in the direction of color-changing fluorescent materials, organic chemistry methods, chemical instruments and methods, etc., can solve the problem of unpredictable fluorescence color
Active Publication Date: 2018-12-18
BEIJING NORMAL UNIVERSITY
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However, the luminescent properties of p-phenylene vinylene-type compounds not only depend on the properties of the single molecule itself, but also are usually affected by factors such as molecular configuration, molecular packing and arrangement, and aggregate particle size in its aggregates. Its solid-state fluorescent color will have a certain degree of unpredictability
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Embodiment 1
[0033] 1. Weigh 0.0664g of 1,4-bis(1-cyano-2-phenylethenyl)benzene and 0.1821g of 2,3,5,6-tetrafluorohydroquinone;
[0034] 2. Mix the two evenly, put them in the MM200 ball mill, add 3 drops of chloroform with a dropper, then put them into the ball mill, and ball mill at 20Hz for 20 minutes;
[0035] 3. Take about 0.1g of the ground powder and dissolve it in 10mL of chloroform, place it at room temperature, and wait for the solvent to evaporate slowly to obtain a binary eutectic single crystal product;
[0036] To characterize the product,
[0037]According to the single crystal X-ray diffraction analysis, the cyano-substituted p-phenylene vinylene and 2,3,5,6-tetrafluorohydroquinone form a two-component with a double ring structure through intermolecular multiple hydrogen bond interactions Co-crystal products such as figure 1 shown.
[0038] It can be seen from the fluorescence spectrum that the maximum emission of the new co-crystal material is at about 498nm, and it sho...
Embodiment 2
[0041] 1. Weigh 0.0332g of 1,4-bis(1-cyano-2-phenylethenyl)benzene and 0.0420g of 2,3,5,6-tetrafluoro-4-hydroxybenzoic acid, dissolve in 6mL Chloroform solvent, using ultrasonic or heating means to make it dissolve as much as possible, at this time, the liquid gradually turns into a light blue-green turbid liquid;
[0042] 2. Add methanol solvent to the light blue-green turbid liquid drop by drop until the solution is clear and transparent. The volume of methanol added is about 0.5-1mL, and then continue to sonicate or heat to make the solution evenly mixed and the solute fully dissolved;
[0043] 3. After standing for 1-2 weeks under natural volatilization conditions, the eutectic compound of cyano-substituted p-phenylene vinylene and 2,3,5,6-tetrafluoro-4-hydroxybenzoic acid can be obtained;
[0044] To characterize the product,
[0045] According to the analysis of single crystal X-ray diffraction, the cyano-substituted p-phenylene vinylene and 2,3,5,6-tetrafluoro-4-hydrox...
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Abstract
The invention discloses a fluorescent color changing eutectic material under ultra-high pressure conditions and a preparation method thereof, and belongs to the field of molecular solid-state light-emitting materials. A plurality of multi-fluoro-substituted organic small molecules are selected as co-assembly units, and a novel multi-component molecular co-crystal compound is prepared by using a solvent-assisted grinding method, a solvent evaporation method, an ultrasonic synthesis method and the like. Cyano substituted p-phenylene vinyl type molecules and the co-assembled small molecules mutually recognize each other through multiple hydrogen bonds, Pi- Pi force and other non-covalent forces to form a structure-ordered supramolecular structure, changing self-stacking molecular configuration and spatial arrangement of original cyano-substituted phenylene vinyl type molecules so as to achieve a certain modulation effect on photophysical properties. The novel fluorescent color changing eutectic material prepared by the method can produce different fluorescent discoloration behaviors under the ultra-high pressure conditions, is the first fluorescent discoloration eutectic system underthe ultra-high pressure conditions, and has application prospects in the fields of new optical sensors and pressure sensitive materials and the like.
Description
technical field [0001] The invention belongs to the technical field of molecular solid luminescent materials, in particular to a fluorescent color-changing eutectic material under ultra-high pressure conditions and a preparation method thereof. Background technique [0002] High-pressure chemistry refers to an interdisciplinary science that studies the composition, properties, structure and changes of substances under high-pressure environmental conditions. Under the extreme conditions of ultra-high pressure, the structure and properties of many well-known substances will undergo tremendous changes. For example, in 2013, Zhang Weiwei et al. reported that sodium chloride crystals have multiple crystal forms under high pressure conditions. The stoichiometric ratio of sodium ions and chloride ions in the crystals obtained through experiments is 1:3 or 3:1, which is not what people expected. The familiar 1:1 under normal pressure conditions. In-situ testing under high-pressure...
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