A wet-sensitive color-changing functional complex material, a preparation method and application thereof

Abstract

The present application belongs to the technical field of complex materials, and relates to a wet-sensitive color-changing functional complex material, a preparation method thereof and application. The wet-sensitive color-changing functional complex material prepared by the present application has a chemical formula of Na2Cu(C6S2O6NH5)2(NH3)2. The present application further provides a preparation method of the complex material. The prepared complex material has excellent wet-sensitive color-changing performance, can be reused, and has the advantages of simple preparation process, environmental protection, low cost, suitability for large-scale production, and wide application prospects in the fields of humidity visual monitoring, medical treatment, food, agriculture and camouflage.

Description

Technical Field

[0001] This invention belongs to the field of coordination material technology, specifically relating to a coordination material with moisture-sensitive color-changing function, its preparation method and application. Background Technology

[0002] Humidity-sensitive color-changing materials have wide applications in construction, medicine, food, agriculture, and camouflage. Although some humidity-sensitive materials have been developed, their mechanisms of action and applications still have limitations. For example, many color-changing materials contain organic compounds harmful to human health, and their preparation processes are complex and costly, thus restricting their application. By designing and synthesizing organic ligands with special functional groups and self-assembling them with metal ions, novel and functionally superior coordination compounds can be obtained. These coordination compounds possess unique structural characteristics and are simple, environmentally friendly, and inexpensive to prepare, showing broad application prospects in optics, electronics, magnetism, sensing, catalysis, and biomedicine. Developing coordination compounds with humidity-sensitive color-changing functions enables visualized humidity monitoring, possessing broad and significant application value, and has therefore become a current research hotspot. Summary of the Invention

[0003] Based on the above background, this invention provides a moisture-sensitive color-changing complex material, its preparation method, and its application. The moisture-sensitive color-changing complex material prepared by this invention has excellent moisture-sensitive color-changing properties, can be reused, and its preparation process is simple, environmentally friendly, low-cost, and suitable for large-scale production.

[0004] Technical solution of the present invention:

[0005] A moisture-sensitive color-changing complex material is characterized in that the chemical formula of the complex material is Na2Cu(C6S2O6NH5)2(NH3)2, where C6S2O6NH5 is a 2-amino-1,4-benzenedisulfonic acid anion; the complex material belongs to the monoclinic crystal system, space group P 21 / c, and the cell parameters are: a = 10.2027(7) Å, b = 18.2972(11) Å, c = 5.7801(4) Å, α = 90°, β = 101.743(6)°, γ = 90°, V = 1056.45(12) Å. 3 The crystallographic data are shown in Table 1. The structural unit of this complex consists of one copper ion and two sodium ions as metal centers, connected to two 2-amino-1,4-benzenedisulfonic acid anions and two coordinated ammonia molecules, and forms a three-dimensional framework structure through the bridging effect of sulfonic acid groups.

[0006] Table 1 Crystallographic data of coordination materials

[0007] Formula <![CDATA[C 12 H 16 N4Na2S4CuO 12 ]]> Mr 646.06 Crystal system Monoclinic Space group <![CDATA[P 21 / c]]> a (Å) 10.2027(7) b (Å) 18.2972(11) c (Å) 5.7801(4) α (°) 90° β (°) 101.743(6)° γ (°) 90° <![CDATA[V (Å 3 )]]> 1056.45(12) F(000) 654.0 Z 2 <![CDATA[Dx (g cm –3 )]]> 2.031 <![CDATA[μ (mm –1 )]]> 1.544 θ range (°) 3.769- 25.242 Ref. meas. / indep. 3620 Obs. ref. 1875 <![CDATA[R int ]]> 0.0292 <![CDATA[R1 a ]]> 0.0418 <![CDATA[wR2(all data) b ]]> 0.1176 Goof 1.090 <![CDATA[Δρ(max, min) (e Å -3 )]]> 0.792, -0.955

[0008] a R1 = Σ||F o | – |F c || / Σ|F o | b wR2 = 1 / 2 .

[0009] A moisture-sensitive color-changing complex material and its preparation method include the following steps:

[0010] (1) Dissolve 28 parts by mass of copper acetate monohydrate in 1500 parts by mass of deionized water to obtain a homogeneous copper acetate solution for later use.

[0011] (2) Dissolve 10 parts by weight of 2-amino-1,4-benzenedisulfonic acid monosodium salt in 1500 parts by weight of deionized water to obtain a homogeneous solution for later use.

[0012] (3) Add the solution obtained in step (2) to the copper acetate solution obtained in step (1) and stir at room temperature for 1 hour to obtain a homogeneous blend solution;

[0013] (4) The blend solution obtained in step (3) above is sealed in a beaker with plastic wrap, and then placed in an oven at 80°C for 48 hours. After that, it is cooled to room temperature, filtered, washed and dried to obtain complex crystals (the color of which is green).

[0014] (5) After exposing the complex crystals obtained in step (4) above to an ammonia environment for 30 seconds, a complex material with moisture-sensitive color-changing function (its color is blue) is obtained.

[0015] The beneficial effects of this invention are as follows:

[0016] The humidity-sensitive color-changing complex material prepared by this invention has excellent humidity-sensitive color-changing properties, can be reused, and has a simple, environmentally friendly, and low-cost preparation process. It is also suitable for large-scale production and has broad application prospects in fields such as humidity visualization monitoring, medical treatment, food, agriculture, and camouflage. Attached Figure Description

[0017] Figure 1 This is a crystal structure unit diagram of the moisture-sensitive color-changing complex material prepared according to the present invention.

[0018] Figure 2 This is a three-dimensional framework structure diagram of the moisture-sensitive color-changing complex material prepared according to the present invention. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to specific embodiments.

[0020] Example:

[0021] A moisture-sensitive color-changing complex material has the chemical formula Na2Cu(C6S2O6NH5)2(NH3)2, where C6S2O6NH5 is a 2-amino-1,4-benzenedisulfonic acid anion. This complex material belongs to the monoclinic crystal system, space group P 21 / c, and its cell parameters are: a = 10.2027(7) Å, b = 18.2972(11) Å, c = 5.7801(4) Å, α = 90°, β = 101.743(6)°, γ = 90°, V = 1056.45(12) Å. 3 Its crystallographic data are shown in Table 1. The structural unit of this complex consists of one copper ion and two sodium ions as the metal center, connected to two 2-amino-1,4-benzenedisulfonic acid anions and two coordinated amine molecules (e.g., Figure 1 As shown), and through the bridging effect of sulfonic acid groups, a three-dimensional framework structure is formed (such as...). Figure 2 (As shown).

[0022] The preparation method of the above-mentioned moisture-sensitive color-changing complex material includes the following steps:

[0023] (1) Dissolve 28 parts by mass of copper acetate monohydrate in 1500 parts by mass of deionized water to obtain a homogeneous copper acetate solution for later use.

[0024] (2) Dissolve 10 parts by weight of 2-amino-1,4-benzenedisulfonic acid monosodium salt in 1500 parts by weight of deionized water to obtain a homogeneous solution for later use.

[0025] (3) Add the solution obtained in step (2) to the copper acetate solution obtained in step (1) and stir at room temperature for 1 hour to obtain a homogeneous blend solution;

[0026] (4) The blend solution obtained in step (3) above is sealed in a beaker with plastic wrap, and then placed in an oven at 80°C for 48 hours. After that, it is cooled to room temperature, filtered, washed and dried to obtain complex crystals (the color of which is green).

[0027] (5) After exposing the complex crystals obtained in step (4) above to an ammonia environment for 30 seconds, a complex material with moisture-sensitive color-changing function (its color is blue) is obtained.

[0028] Performance testing and applications:

[0029] The humidity-sensitive color-changing complex material prepared in the embodiments of this invention is blue in color. After being exposed to an environment with a relative humidity of 90%, its color turns green, indicating that the complex material has excellent humidity-sensitive color-changing properties. In addition, after the complex material that turned green was exposed to an ammonia environment for 30 seconds, its color returned to blue. After being exposed to an environment with a relative humidity of 90% again, its color turned green again. The above results show that the humidity-sensitive color-changing complex material prepared in the embodiments of this invention has reversible humidity-responsive color-changing properties and can be reused.

[0030] The humidity-sensitive color-changing complex material prepared in the embodiments of this invention has the chemical formula Na2Cu(C6S2O6NH5)2(NH3)2 and is blue in color. When exposed to an environment with a relative humidity of 90%, its color changes to green, indicating that the multifunctional complex material undergoes a structural transformation after the humidity-sensitive color change. Therefore, X-ray single-crystal diffraction analysis was performed on the aforementioned green-colored complex material, and the results showed that its chemical formula is Na2Cu(C6S2O6NH5)2(H2O)2. It can be seen that when the humidity-sensitive color-changing complex material prepared in the embodiments of this invention is placed in an ammonia environment, two coordinated ammonia molecules are transformed into two coordinated water molecules. This changes the coordination environment between the central sodium ion and copper ion, thereby causing the humidity-sensitive color-changing complex material to change from the initial blue to green after the humidity response.

[0031] In summary, the humidity-sensitive color-changing complex material prepared by this invention has excellent humidity-sensitive color-changing properties, can be reused, and has a simple, environmentally friendly, and low-cost preparation process. It is also suitable for large-scale production and applicable to the visual monitoring of humidity, and has broad application prospects in the fields of medicine, food, agriculture, and camouflage.

[0032] The content of this invention is not limited to the embodiments listed. Any equivalent modifications made by those skilled in the art to the technical solutions of this invention by reading this specification are covered by the claims of this invention.

Claims

1. A complex material with moisture-sensitive color-changing function, characterized in that, The chemical formula of the complex material is Na2Cu(C6S2O6NH5)2(NH3)2, where C6S2O6NH5 is the 2-amino-1,4-benzenedisulfonic acid anion. This complex material belongs to the monoclinic crystal system, space group P 21 / c, and its cell parameters are: a = 10.2027(7) Å, b = 18.2972(11) Å, c = 5.7801(4) Å, α = 90°, β = 101.743(6)°, γ = 90°, V = 1056.45(12) Å. 3 The crystallographic data are shown in Table 1. The structural unit of this complex consists of one copper ion and two sodium ions as metal centers, connected to two 2-amino-1,4-benzenedisulfonic acid anions and two coordinated ammonia molecules, and forms a three-dimensional framework structure through the bridging effect of sulfonic acid groups. Table 1 Crystallographic data of coordination materials a R1 = Σ||F o | – |F c || / Σ|F o |. b wR2 =[Σw(|F o 2 |–|F c 2 |) 2 / Σw(|F o 2 |) 2 ] 1 / 2 。 2. The method for preparing the moisture-sensitive color-changing complex material according to claim 1, characterized in that... Includes the following steps: (1) Dissolve 28 parts by mass of copper acetate monohydrate in 1500 parts by mass of deionized water to obtain a homogeneous copper acetate solution for later use. (2) Dissolve 10 parts by weight of 2-amino-1,4-benzenedisulfonic acid monosodium salt in 1500 parts by weight of deionized water to obtain a homogeneous solution for later use. (3) Add the solution obtained in step (2) to the copper acetate solution obtained in step (1) and stir at room temperature for 1 h to obtain a homogeneous blend solution; (4) The blend solution obtained in step (3) above is sealed in a beaker with plastic wrap, and then placed in an oven at 80°C for 48 hours. After that, it is cooled to room temperature, filtered, washed and dried to obtain complex crystals. (5) After exposing the complex crystals obtained in step (4) above to an ammonia environment for 30 seconds, a complex material with moisture-sensitive color-changing function is obtained.

3. The application of the moisture-sensitive color-changing complex material according to claim 1, characterized in that, Visualized monitoring of humidity.

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