Method for regulating fluorescence performance of helical nanobelt

Abstract

The application relates to a method for regulating the fluorescence performance of a spiral nanobelt. 4-amino phthalic acid and an amino acid are added into deionized water in a 1:1 molar ratio, and a mixed solution is obtained by ultrasonic homogenization. The mixed solution is transferred into a hydrothermal reaction kettle, and after hydrothermal reaction, the reaction is cooled to room temperature. Suspended matter appearing in the reaction is a fluorescent chiral 4-ATAD spiral nanobelt. When the reaction temperature is increased from 120 DEG C to 180 DEG C, the fluorescence emission wavelength of the product spiral belt is changed from 540 nm to 400 nm, and the fluorescence performance of the 4-ATAD spiral nanobelt is regulated. The method disclosed by the application is simple in operation, low in cost and friendly to the environment. The product has fluorescence and chirality, and the fluorescence emission range of the spiral nanobelt can be changed in the range of 400-550 nm by adjusting the hydrothermal reaction temperature. The method has wide application potential in the fields of photoelectric display and information encryption.

Description

Technical Field

[0001] This invention belongs to the fields of chemistry and materials science and technology, and specifically relates to a method for regulating the fluorescence properties of helical nanoribbons. Background Technology

[0002] Due to their optical activity, circular dichroism, and selective emission of polarized light, circularly polarized luminescent (CPL) materials are considered the core of many optical and electronic devices, with enormous application prospects in three-dimensional imaging, information storage, biological probes, and spintronic devices. Therefore, CPL materials have gradually become a new research hotspot in the field of chirality in recent years. Luminescence and chirality are the two fundamental elements of a material exhibiting CPL properties, and the key to constructing CPL materials is the chiral arrangement of the luminescent units. Researchers have used various techniques to arrange or assemble different luminescent units into chiral structures, and have developed metal complexes, small organic molecules, supramolecular systems, and polymer materials with CPL properties. Among them, the luminescent units of polymer materials are linked by covalent bonds, giving them the advantage of stable luminescence performance. Furthermore, they exhibit higher quantum yield (φ) and asymmetry factor (g) only in solution compared to other materials. lum Unlike other materials, polymer materials are easier to process into films, and the CPL properties of these films are even stronger, making them the most likely CPL materials to be applied to related devices.

[0003] Although significant progress has been made in the research of CPL polymers in recent years, much work remains to be done before these materials can be applied practically. In previous work, the applicant used aniline derivative 4-aminophthalic acid (4-ATA) as a precursor to prepare chiral helical nanoribbons with stable fluorescence emission wavelengths in the 528-547 nm range via a simple one-step hydrothermal reaction. This material shows promising application prospects in CPL devices, 3D displays, and other fields. To obtain chiral organic polymer molecules with different fluorescence emission wavelengths, the applicant added amino acids to the reaction system and discovered that the fluorescence emission range could be controlled by adjusting the reaction temperature, further broadening its potential application value. Summary of the Invention

[0004] Given the above research background and significance, the purpose of this invention is to broaden the application range of 4-ATAD helical nanoribbons by regulating their fluorescence properties through the addition of amino acids and temperature control.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for regulating the fluorescence properties of helical nanoribbons includes the following steps:

[0007] 4-Aminophthalic acid and amino acids were added to deionized water in a 1:1 molar ratio and ultrasonically homogenized to obtain a mixture. The mixture was then transferred to a hydrothermal reactor and cooled to room temperature after the hydrothermal reaction. The suspended matter appearing in the reactants was the fluorescent chiral helical nanoribbon. When the reaction temperature was increased from 120℃ to 180℃, the fluorescence emission wavelength of the product helical ribbon changed from 540nm to 400nm, thereby achieving the regulation of the fluorescence performance of the helical nanoribbon.

[0008] Furthermore, the amino acid is phenylalanine, tryptophan, glutamic acid, or alanine.

[0009] Furthermore, the concentration of the mixture is 0.01-0.06 mol / L; the hydrothermal reaction time is 3-7 hours.

[0010] Compared with the prior art, the beneficial effects of this invention are as follows: This invention uses 4-aminophthalic acid (4-ATA) as a precursor and synthesizes meta-condensed 4-aminophthalic acid dimer (4-ATAD) dimer through a one-step hydrothermal reaction combined with the addition of amino acids. Testing has confirmed that it is a helical nanoribbon with fluorescent chirality. Furthermore, research has found that the fluorescence emission range of the helical nanoribbon can be varied from 400-550 nm by adjusting the hydrothermal reaction temperature, thus broadening its application range. The preparation method disclosed in this invention is simple to operate, low in cost, and environmentally friendly. The product simultaneously possesses fluorescence emission properties and chirality, and has broad application potential in fields such as optoelectronic displays and information encryption. Attached Figure Description

[0011] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0012] Figure 1 (a) Scanning electron microscope (SEM) and (b) Transmission electron microscope (TEM) images of product LY-4-ATAD; (c) Scanning electron microscope (SEM) and (d) Transmission electron microscope (TEM) images of product DY-4-ATAD.

[0013] Figure 2 (a) Liquid chromatograms and (b) chromatograms of the obtained products 4-ATAD, LY-4-ATAD, and DY-4-ATAD. 1 (c) H NMR spectrum, (d) mass spectrum.

[0014] Figure 3The circular dichroism (CD) spectra of the obtained products 4-ATAD, LY-4-ATAD and DY-4-ATAD are shown.

[0015] Figure 4 The fluorescence spectra of 4-ATAD prepared at different temperatures are shown.

[0016] Figure 5 The fluorescence spectra of LY-4-ATAD prepared at different temperatures are shown.

[0017] Figure 6 The fluorescence spectra of DY-4-ATAD prepared at different temperatures are shown. Detailed Implementation

[0018] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0020] Example 1:

[0021] Step 1) Add 0.1358g of 4-ATA and 0.1531g of L-tryptophan (or D-tryptophan) to an Erlenmeyer flask, then add 15ml of water, and sonicate at room temperature to form a mixed solution with a concentration of 0.05mol / L.

[0022] Step 2) Fill the mixture obtained in Step 1) into a polytetrafluoroethylene liner, place the liner into the stainless steel reactor kit, and tighten the kit.

[0023] Step 3) Place the reactor from Step 2) in an oven and raise it from room temperature to 160°C within half an hour, then maintain the temperature for 7 hours;

[0024] Step 4) Turn off the oven power and let the reactor cool naturally to room temperature; put the solution in the reactor liner into a centrifuge tube, centrifuge at high speed (1000 r / min), and obtain the product in the precipitate, which is denoted as LY-4-ATAD (or DY-4-ATAD). Perform morphological characterization, chemical structure characterization and performance testing on the product.

[0025] like Figure 1The images show SEM and TEM images of the product obtained in Example 1. As can be seen from the images, the main structure of the product is a helical nanoribbon with a width of about 8 nm, a length of 300-800 nm, and a helical period of about 30 nm.

[0026] In contrast, this application also prepared 4-ATAD helical nanoribbons made from pure 4-ATA without amino acids.

[0027] like Figure 2 The figure shows the liquid chromatography, nuclear magnetic resonance (NMR) coating, and mass spectra of 4-ATAD, LY-4-ATAD, and DY-4-ATAD. The results show that the main chemical component of the product obtained from pure 4-ATA is a meta-condensed 4-ATAD dimer. The product has a certain degree of crystallinity. The product after adding amino acids is also a 4-ATAD dimer, and the structure does not change.

[0028] Figure 3 The CD and fluorescence spectra of the obtained product are shown, indicating that the product has optical chirality.

[0029] Figure 4-6 The fluorescence spectra of 4-ATAD, LY-4-ATAD, and DY-4-ATAD prepared at different temperatures are shown below. Figure 4 It can be seen that the fluorescence wavelength of 4-ATAD does not change significantly at different temperatures. Figure 5 and 6 As can be seen, the fluorescence wavelengths of LY-4-ATAD and DY-4-ATAD gradually shift with increasing temperature, ranging from 400 to 545 nm.

[0030] The above results indicate that the main structure of the prepared product is a helical nanoribbon, and the main chemical component is 4-ATA dimer. After adding amino acids to the reaction system, the fluorescence emission wavelength of the product (range of 400-545 nm) can be controlled by changing the reaction temperature.

[0031] The experiment found that, under the premise that other experimental conditions remain unchanged, replacing tryptophan with phenylalanine, glutamic acid or alanine can regulate the stable optical chiral properties of the obtained product.

[0032] The experiment found that, under the premise that other experimental conditions remain unchanged, the range of fluorescence emission wavelength of the obtained product can be adjusted by varying the hydrothermal reaction temperature between 100-200℃.

[0033] In summary, the method for preparing fluorescent chiral helical nanoribbons disclosed in this invention is simple to operate, low in cost, and has relatively relaxed synthesis conditions. Moreover, the product exhibits stable luminescence properties and obvious chiral optical signals, showing promising application prospects.

[0034] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for regulating the fluorescence properties of helical nanoribbons, characterized in that, Includes the following steps: 4-Aminophthalic acid and amino acids were added to deionized water in a 1:1 molar ratio and ultrasonically homogenized to obtain a mixture. The mixture was then transferred to a hydrothermal reactor and cooled to room temperature after the hydrothermal reaction. The suspended matter appearing in the reactants was the fluorescent chiral helical nanoribbon. When the reaction temperature was increased from 120℃ to 180℃, the fluorescence emission wavelength of the product helical ribbon changed from 540nm to 400nm, thereby achieving the regulation of the fluorescence performance of the helical nanoribbon.

2. The method for regulating the fluorescence properties of helical nanoribbons as described in claim 1, characterized in that, The amino acid is phenylalanine, tryptophan, glutamic acid, or alanine.

3. The method for regulating the fluorescence properties of helical nanoribbons as described in claim 1, characterized in that, The concentration of the mixture is 0.01-0.06 mol / L; the hydrothermal reaction time is 3-7 hours.

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