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3-Aminopyrazine-2-carboxylic acid is a solid compound, commonly in the form of colorless to light yellow crystalline powder. Has good solubility in water. At room temperature, it is soluble in water and forms a colorless solution. It is an acidic compound with a pKa value of approximately 3.8. There is an absorption peak within the visible ultraviolet range. It exhibits an absorption peak in ultraviolet light with a wavelength range of 200-400 nm, with a maximum absorption wavelength typically between 230-240 nm. The infrared spectrum displays a series of vibrational frequencies and bond information. Typical infrared absorption peaks include carbonyl (C=O) stretching vibrations, amino (N-H) stretching vibrations, and C-H stretching vibrations on aromatic rings. Relatively unstable at high temperatures and may undergo decomposition and degradation. Therefore, it is necessary to avoid excessive temperatures during storage and handling. It is an organic compound that may burn under appropriate conditions. However, under general conditions, it is not easy to burn. It has a wide range of applications in coordination chemistry, including the preparation of metal complexes, catalytic reactions, fluorescent probes, biosensors, antibacterial/fungicides, toxin detection, and optoelectronic materials. It has important applications in the field of drug research. It can be used as a structural framework for drug molecules and can be modified and functionalized to prepare compounds with specific pharmacological activities. This compound has been widely used in the research of anti-tumor drugs, anti infective drugs, antibacterial drugs, and other fields.
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Chemical Formula |
C5H5N3O2 |
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Exact Mass |
139 |
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Molecular Weight |
139 |
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m/z |
139 (100.0%), 140 (5.4%), 140 (1.1%) |
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Elemental Analysis |
C, 43.17; H, 3.62; N, 30.21; O, 23.00 |
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3-Aminopyrazine-2-carboxylic acid (APCA) is an organic molecule with multiple coordination sites of nitrogen and oxygen atoms, making it widely used in coordination chemistry.
Application in the field of pesticides
3-Aminopyrazine-2-carboxylic acid and its derivatives have shown great potential in the field of fungicides due to their excellent antibacterial activity. Research has shown that compounds containing pyrazine ring structures can often interfere with bacterial cell wall synthesis, inhibit bacterial protein synthesis, or damage bacterial DNA, thereby exerting bactericidal effects. As an important derivative of pyrazine ring, it also possesses these potential bactericidal mechanisms. By introducing different substituents, 3-aminopyrazine-2-carboxylic acid derivatives with broad-spectrum bactericidal activity can be synthesized. These derivatives can inhibit the growth and reproduction of various plant pathogens, such as bacterial diseases, fungal diseases, etc. Compared to traditional fungicides, these new compounds may have lower toxicity, better environmental compatibility, and longer shelf life. In addition to broad-spectrum fungicides, compounds with specific bactericidal activity can also be synthesized through structural optimization. These compounds can exert bactericidal effects against specific plant pathogens while being harmless to other non target organisms. The development of this specific fungicide can help reduce the use of pesticides, lower environmental pollution risks, and improve crop yield and quality.
Development and application of fungicides
The development of fungicides based on 3-Aminopyrazine-2-carboxylic acid has become one of the research hotspots in the field of pesticides. At present, multiple fungicides based on this compound have been reported and have shown good bactericidal effects and application prospects. Some derivatives of 3-aminopyrazine-2-carboxylic acid have good inhibitory effects on plant pathogens such as rice blast fungus and wheat Fusarium graminearum. These compounds inhibit the growth and reproduction of pathogenic bacteria by interfering with their cellular metabolic processes, thereby achieving the goal of disease prevention and control. In practical applications, these fungicides can be applied through foliar spraying, soil treatment, and other methods to effectively control the occurrence and spread of plant diseases.
The presence of pyrazine ring structure suggests that this compound may have the ability to interfere with plant growth regulation mechanisms, thereby exerting herbicidal effects. Research has shown that certain compounds containing pyrazine ring structures can interfere with plant auxin synthesis, transport, or signaling processes, leading to abnormal plant growth and even death. 3-Aminopyrazine-2-carboxylic acid, as an important derivative of pyrazine ring, may also have these potential herbicidal mechanisms. By structural modification, 3-Aminopyrazine-2-carboxylic acid derivatives with selective herbicidal activity can be synthesized. These derivatives can exert weeding effects on specific weed species without harming crops. The development of this selective herbicide can help reduce the use of pesticides, lower environmental pollution, and improve crop yield and quality.
Development and application prospects of herbicides
In order to synthesize 3-aminopyrazine-2-carboxylic acid derivatives with herbicidal activity, a reasonable synthesis strategy needs to be adopted. This includes selecting appropriate raw materials, reaction conditions, and catalysts to optimize the structure and properties of the product. At the same time, factors such as product stability, solubility, and bioavailability need to be considered to ensure its effectiveness in practical applications. With the continuous development of agricultural production and the increasing demand for environmental protection, there is a growing demand for efficient, low toxicity, and environmentally friendly herbicides. 3-Aminopyrazine-2-carboxylic acid and its derivatives have broad application potential in this field due to their unique chemical structure and potential herbicidal activity. In the future, with the deepening of research and advances in technology, these compounds are expected to become important sources of new herbicides.
The following are the brief steps and corresponding chemical equations for synthesizing 3-Aminopyrazine-2-carboxylic acid from methyl cyanoacetate as the starting material:
1. Synthesis of 3-Aminopyrazine-2-one:
Firstly, methyl cyanoacetate is reacted with ammonium cyanide to produce 3-aminopyrazine-2-nitrile. Then, 3-aminopyrazine-2-nitrile is converted into 3-aminopyrazine-2-one through a hydroxylamine reaction.
Chemical equation:
C4H5NO2+CH2N2 → C5H4N4
C5H4N4+H3NO → 3-aminopyrazin-2-one
2. Reduction of 3-aminopyrazine-2-one:
By reducing 3-aminopyrazine-2-one with a catalyst (such as iron powder or ferrous salt), the ketone group is reduced to an alcohol group to obtain 3-aminopyrazine-2-ol.
Chemical equation:
3-aminopyrazine-2-one+catalyst+H2 → 3-aminopyrazine-2-ol
3. Acidified 3-aminopyrazine-2-ol:
Acidify 3-aminopyrazine-2-ol with concentrated sulfuric acid to obtain APCA.
Chemical equation:
3-Aminopyrazine-2-ol+H2O4S → C5H5N3O2
A brief step and corresponding chemical equation for a common chemical synthesis method of APCA:
1. Synthesis of 3-Aminopyrazine:
In this synthesis method, pyrazine is first reacted with diethyl malonate to produce acetylated 3-aminopyrazine. Next, acetyl groups are removed through alkaline catalyzed hydrolysis reaction to obtain 3-aminopyrazine.
Chemical equation:
C4H4N2+C7H12O4 → acetylated 3-aminopyrazine
Acetylated 3-aminopyrazine+NaOH/H2O → 3-aminopyrazine
2. Hydroxylated 3-aminopyrazine:
React 3-aminopyrazine with excess hydrogen peroxide (H2O2) under appropriate conditions for hydroxylation to obtain 3-aminopyrazine-2-one.
Chemical equation:
3-aminopyrazine+H2O2 → 3-aminopyrazine 2-one
3. Reduction of 3-aminopyrazine-2-one:
Perform a reduction reaction between 3-aminopyrazine-2-one and a catalyst (such as ferrous salt) to reduce the ketone group to an alcohol group, resulting in 3-aminopyrazine-2-ol.
Chemical equation:
3-aminopyrazine-2-one+catalyst+H2 → 3-aminopyrazine-2-ol
4. Acidified 3-aminopyrazine-2-ol:
Acidify 3-aminopyrazine-2-ol with concentrated sulfuric acid to obtain 3-Aminopyrazine-2-carboxylic acid.
Chemical equation:
3-Aminopyrazine-2-ol+concentrated sulfuric acid → C5H5N3O2
Interaction mechanism between 3-APCA and NV color centers
The coupling between 3-APCA and NV color centers can be achieved through various mechanisms:
Magnetic coupling
If the 3-APCA molecule has unpaired electron spin, its magnetic dipole dipole interaction with the NV color center electron spin can be expressed as H_dip=μ 0/(4 π r3) [N_NV · S-APCA-3 (S-NV · r) (S-APCA · r)/r2], where r is the distance between the two and μ 0 is the vacuum permeability. This interaction can cause small shifts in the spin energy levels of NV color centers (on the Hz kHz scale), which can be detected by microwave spectroscopy or fluorescence.
Electric dipole coupling
The molecular dipole moment of 3-APCA (generated by the charge distribution of amino and carboxyl groups) can interact with the electron cloud of NV color centers, resulting in Stark shift. Its Hamiltonian is H_Stark=- d · E, where d is the molecular dipole moment and E is the electric field at the NV color center. This effect can be used to regulate the optical properties or spin energy levels of NV color centers.
Photo induced interaction
By laser excitation of 3-APCA, the fluorescence or non radiative energy transfer generated by its electronic transitions may affect the excited state dynamics of NV color centers, thereby altering the fluorescence readout signal.
Design and Optimization of Coupling Scheme
Experimental setup and sample preparation
To achieve coupling between 3-APCA and NV color centers, 3-APCA molecules need to be fixed near the diamond surface (distance<10 nm). The specific steps are as follows:
Diamond surface treatment
Oxygen plasma cleaning or acid treatment is used to remove surface pollutants, followed by hydrogen termination or amination modification of the surface to enhance the chemical adsorption of 3-APCA.
3-APCA self-assembly
Immerse the diamond sample in a 3-APCA solution (such as ethanol or water solution, concentration 1-10 mM), and achieve molecular self-assembly through electrostatic forces or covalent bonds (such as reaction between amino groups and carboxyl groups on the diamond surface).
Characterization and verification
Use atomic force microscopy (AFM) or X-ray photoelectron spectroscopy (XPS) to confirm the coverage and orientation of 3-APCA on the diamond surface; Detect whether the optical properties of NV color centers have changed through fluorescence spectroscopy.
Optimization strategy for coupling efficiency
The coupling efficiency is influenced by various factors, including molecular spacing, orientation, ambient temperature, and external fields. The optimization strategy is as follows:
Distance control
By adjusting the concentration of 3-APCA solution or modifying the diamond surface to shorten the distance between molecules and NV color centers. For example, introducing linking molecules (such as alkyl chains) can increase surface roughness and promote 3-APCA to approach the NV color center.
Orientation regulation
Design chemical modifications of 3-APCA (such as replacing amino groups with orientation groups) or apply an external electric field to align the molecular dipole moment or spin axis with the symmetry axis of the NV color center, maximizing coupling strength.
Temperature and field regulation
Lowering the temperature can reduce thermal noise and prolong the spin coherence time of NV color centers; Applying an external magnetic field can adjust the spin energy level of NV color centers and optimize the resonance conditions with 3-APCA.
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