Metal organic optical waveguide material with solvatochromism and application of metal organic optical waveguide material in field of information storage

Abstract

The invention discloses a metal organic optical waveguide material with lyochromism and application of the metal organic optical waveguide material in the field of information storage. The preparation method of the material comprises the following steps: mixing phthalonitrile and silver tetrafluoroborate according to a molar ratio of 0.005-70, then adding acetonitrile for ultrasonic dissolution, slowly volatilizing at room temperature, and obtaining the microcrystalline material after the solvent is volatilized. Placing the coordination polymer in a humid environment for 12 hours, wherein the structure of the coordination polymer is connected from a one-dimensional coordination polymer to a two-dimensional coordination polymer; then placing in an acetonitrile atmosphere for 20 hours to convert the structure from a two-dimensional coordination polymer to a one-dimensional coordination polymer; the structure conversion and color conversion cycle is reversible. According to the invention, not only is solvent-induced tunable photoluminescence realized, but also a color-tunable optical waveguide system is constructed, a miniature active optical waveguide system with high safety and high information density is developed by using the material, and the application of the material in the field of information storage is shown.

Description

Technical Field

[0001] This invention belongs to the field of optical functional materials technology, specifically relating to a metal-organic optical waveguide material with lyochromic properties and its application in the field of information storage. Background Technology

[0002] Materials with stimulus-responsive properties are widely used in information storage and anti-counterfeiting fields due to their reversible changes in appearance or color. However, with the advent of the big data era, there is an urgent need for advanced information security and storage technologies. Traditional photosensitive materials are far from meeting the demands of the times. Notably, photoluminescent materials with dynamically tunable photophysical properties show fascinating promise in the field of information security, especially those with tunable emission characteristics. Therefore, developing stimulus-responsive material systems with high color gamut resolution will provide a key material foundation for building next-generation information security technologies.

[0003] Optical waveguide materials are typical dielectric devices for propagating optical signals and play a crucial role in optical integration. Based on the ability of luminescent centers with different excited states to simultaneously capture multiple photons, constructing novel optical waveguide materials with tunable emission colors is at the forefront of research in optical communication and optical anti-counterfeiting. As information carriers, color-tunable optical waveguide materials can not only ensure accurate information transmission but also greatly expand information transmission capabilities. Solvent-stimulated response methods can not only efficiently control the emission color of optical waveguide materials, but their rich optical parameters also help to further control other properties of optical waveguide materials. However, currently, optical waveguide materials with solvent-stimulated response characteristics are rarely reported.

[0004] In specialized fields involving information security, information transmission and storage systems require multi-layered security protection mechanisms. These mechanisms not only necessitate the use of encryption-level information protection technologies but also require dynamic information writing and erasure mechanisms. Against this backdrop, the development of new high-density information storage media has become a strategic priority across various sectors. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing a novel optical waveguide material with lyochromic properties. This method not only achieves solvent-induced tunable photoluminescence but also constructs a color-tunable optical waveguide system. Furthermore, this material is used to develop a class of highly secure and high-information-density micro-active optical waveguide systems, demonstrating their application in the field of information storage.

[0006] The preparation method of the solubility-chromatic metal-organic optical waveguide material is as follows: phthalonitrile and silver tetrafluoroborate are mixed in a molar ratio of 0.005-70, then acetonitrile is added and dissolved by ultrasonication. The mixture is then slowly evaporated at room temperature. After the solvent evaporates, a microcrystalline material is obtained, which is the solubility-chromatic metal-organic optical waveguide material.

[0007] The structural transformation method of the lyochromic metal-organic optical waveguide material is as follows: the lyochromic metal-organic optical waveguide material is placed in a humid environment for 12 hours, and its structure is transformed from a one-dimensional coordination polymer to a two-dimensional coordination polymer; then it is placed in an acetonitrile atmosphere for 20 hours, and its structure is transformed from a two-dimensional coordination polymer back to a one-dimensional coordination polymer; the structural transformation and color change are cyclically reversible.

[0008] The metal-organic optical waveguide material with lyochromic properties prepared above can be used as an information storage material.

[0009] This invention uses phthalonitrile organic compounds as building blocks and employs a solvent evaporation method to self-assemble them with silver tetrafluoroborate to form a novel metal-organic complex material with lyochromic properties. The self-assembly of phthalonitrile organic compounds and silver tetrafluoroborate effectively promotes intersystem crossing between singlet and triplet states, achieving highly efficient photoluminescence. Furthermore, the tunable coordination mode of silver ions allows the metal-organic material to undergo structural transformation under solvent stimulation, thereby controlling the solvent-induced molecular structure and electron transfer path of the metal-organic material through a lyochromic strategy, thus altering its photoluminescence color. Finally, due to the material's smooth surface and highly ordered structure, it exhibits excellent optical waveguide properties. In summary, the material prepared by this invention possesses reversible lyochromic properties and full phosphorescent emission waveguide characteristics, exhibiting active optical waveguide properties both before and after lyochromic transformation. Its waveguide performance can be effectively regulated using lyochromism, and the application of this novel waveguide material in the field of information storage is demonstrated. Attached Figure Description

[0010] Figure 1 Assembly mode and crystal spatial arrangement of the lyochromic metal-organic optical waveguide material prepared in Example 1. Optical waveguide material with lyochromic properties. Figure 2 The ultraviolet spectrum of the lyochromic metal-organic optical waveguide material prepared in Example 1. Steady-state and delayed spectral characterization show that this type of metal-organic complex exhibits solvent-stimulated tunable photoluminescence.

[0011] Figure 3 The metal-organic optical waveguide material with solubility-induced color change prepared in Example 1 showed obvious changes in the color of the optical waveguide before and after solvent stimulation response, indicating that the material has multicolor optical waveguide properties with solvent stimulation response characteristics.

[0012] Figure 4 Application of the lyochromic metal-organic optical waveguide material prepared in Example 1 as a photonic communication material. Detailed Implementation

[0013] Example 1 128 mg of phthalonitrile and 292 mg of zinc chloride were dissolved in 5 mL of acetonitrile, sonicated for 10 minutes, and then sealed in a 10 mL glass bottle. The reaction mixture was then allowed to evaporate slowly at room temperature. After the solvent evaporated, one-dimensional rod-shaped crystals were obtained. These single crystals were separated, washed, and dried to obtain the target product.

[0014] Single-crystal X-ray diffraction analysis of the single-crystal product revealed that the organometallic complex belongs to the monoclinic crystal system, space group P21 / c. Ag... + It binds to three nitrogen atoms from two phthalonitrile and one acetonitrile molecule in a tricoordinate manner. Figure 1 a). Ag + Ions are further linked by ligands to form one-dimensional coordination polymers with a herringbone chain structure. These chains exhibit long-range ordered arrangement through cation-anion electrostatic interactions, hydrogen bonds, halogen bonds, and other interactions, ultimately constructing a metal-organic complex material (named Complex 1), which is a metal-organic optical waveguide material with lyochromic properties.

[0015] Upon solvent-induced response, the organometallic complex transforms into an orthorhombic crystal system, space group Pnma. Ag is involved. + It combines in a tetracoordinate manner with nitrogen atoms from two phthalonitriles and oxygen atoms from two water molecules. Figure 1 b). Ag + The ions are further linked by ligands to form two-dimensional coordination polymers. These polymers exhibit long-range ordered arrangement through cation-anion electrostatic interactions, hydrogen bonds, and other interactions, ultimately achieving a structural transformation of the organometallic complex (named complex 1-Y).

[0016] Spectral analysis shows that, when excited at 365 nm, the photoluminescence emission peaks of organometallic complexes 1 and 1-Y are at 520 nm and 535 nm, respectively. Figure 2 Organometallic complex 1 emits green light under ultraviolet light excitation, while organometallic complex 1-Y emits yellow light under ultraviolet light excitation.

[0017] Optical waveguide characterization revealed that this metal-organic complex exhibits color-tunable photoluminescence properties. Furthermore, the waveguide color shows a significant change before and after solvent stimulation, indicating that the material possesses multicolor optical waveguide properties with solvent-stimulated response. Figure 3 ).

[0018] The metal-organic complexes prepared above possess solvent-stimulated optical waveguide properties, and their rich color-tunable optical characteristics endow them with the potential to become advanced photonic communication materials. Figure 4 For example, it can be used as an optical storage system. Its preparation and use process is as follows: Under 365 nm ultraviolet light irradiation, green light emission is defined as representing the "1" state, while yellow light emission induced by solvent represents the "0" state. When the a end of the metal-organic complex microrod is excited with ultraviolet light, the b end will collect green or yellow optical signals, thereby realizing the storage and erasure of massive amounts of information.

Claims

1. A method for preparing a metal-organic optical waveguide material with lyochromic properties, characterized in that, The specific operation of the preparation method is as follows: phthalonitrile and silver tetrafluoroborate are mixed at a molar ratio of 0.005-70, then acetonitrile is added and dissolved by ultrasonication. The mixture is then slowly evaporated at room temperature. After the solvent evaporates, a microcrystalline material is obtained, which is a metal-organic optical waveguide material with lyochromic properties.

2. The method for structural conversion of the metal-organic optical waveguide material with lyochromic properties prepared according to claim 1, characterized in that, The specific operation of the conversion method is as follows: the metal-organic optical waveguide material with lyochromic properties is placed in a humid environment for 12 hours, and its structure is connected from a one-dimensional coordination polymer to a two-dimensional coordination polymer; then it is placed in an acetonitrile atmosphere for 20 hours, and its structure is transformed from a two-dimensional coordination polymer back to a one-dimensional coordination polymer; the structure conversion and color change are cyclically reversible.

3. The application of the lyochromic metal-organic optical waveguide material prepared according to claim 1 as an information storage material.

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