Cadion appears as a light brown to dark brown powdery substance. This color change may be related to the nitro groups and azo bonds in its molecular structure, which play a crucial role in the compound and affect its overall properties. The molecular formula is C18H14N6O2, CAS 5392-67-6, with a density of 1.3 g/cm³. It is easily soluble in organic solvents such as benzene and acetone, which makes it widely applicable in organic synthesis and separation processes. Meanwhile, the compound appears purple in alkaline alcohol solutions, which can be used to detect its presence and purity. However, it is not soluble in water, which limits its application in certain aqueous solution systems. It is used for the detection of cadmium and magnesium, and the main application area of this compound is for the detection of cadmium and magnesium. This use reflects the importance of p-nitrobenzenediazoaminoazobenzene in chemical analysis and detection, especially when detecting cadmium and magnesium elements. By using p-nitrobenzenediazoaminoazobenzene, scientists and laboratory technicians can more accurately analyze and determine the presence and concentration of these elements, which is crucial for many scientific research and industrial applications.
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Chemical Formula |
C18H14N6O2 |
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Exact Mass |
346 |
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Molecular Weight |
346 |
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m/z |
346 (100.0%), 347 (19.5%), 347 (2.2%), 348 (1.8%) |
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Elemental Analysis |
C, 62.42; H, 4.07; N, 24.27; O, 9.24 |
Cadion (CAS No. 5392-67-6), as an important organic compound, has wide applications in chemistry and related fields.
1. Chemical Analysis Field
(1) Calibration of cadmium and magnesium:
Nitrobenzenediazoaminoazobenzene is a commonly used chemical reagent for the determination of cadmium and magnesium in chemical analysis. It can form stable complexes with these metal ions and achieve rapid and accurate detection of these ions through color changes or other detection methods.
(2) In the fields of environmental monitoring, food testing, etc.
the application of nitrobenzenediazoaminoazobenzene is particularly widespread because it can provide a simple and efficient method to detect the content of these metal ions.
2. Dye And Pigment Industry
(1) Synthesis of Azo Dyes and Oxazine Dyes:
Although nitrobenzenediazoaminoazobenzene itself is not a dye, it is an important intermediate in the synthesis of azo dyes and oxazine dyes. Through a series of chemical reactions, it can be transformed into various dyes with specific colors and properties. Azo dyes and oxazine dyes have wide applications in fields such as textiles and printing, and p-nitrobenzenediazoaminoazobenzene provides important intermediates for their synthesis. These dyes have a wide range of applications in industries such as textiles, printing, and coatings, providing products with rich colors and excellent performance.
(2) PH indicator:
In certain specific chemical reactions, p-nitrobenzenediazoaminoazobenzene can also be used as a pH indicator. By changing its color, the acidity and alkalinity of the reaction system can be intuitively determined, providing important reference information for experiments.
3. Research And Teaching
(1) Organic synthesis experiment:
In organic chemistry teaching and research, p-nitrobenzenediazoaminoazobenzene is often used in organic synthesis experiments. By studying its synthesis, properties, and reactions, students and researchers can gain a deeper understanding of the basic principles and reaction mechanisms of organic chemistry.
At the same time, the synthesis process of nitrobenzenediazoaminoazobenzene also involves various organic synthesis techniques and methods, providing valuable practical opportunities for the teaching and research of organic chemistry.
(2) Analytical Chemistry Experiment:
In analytical chemistry experiments, p-nitrophenyldiazoaminoazobenzene is commonly used as a standard reagent or indicator. Its unique chemical properties make it irreplaceable in experiments.
For example, in acid-base titration experiments, p-nitrobenzenediazoaminoazobenzene can be used as an indicator to determine the titration endpoint based on its color change; In ion identification experiments, it can also react with specific ions and produce significant color changes.
4. Other Fields
(1) Foaming agents for rubber and resin:
In the production process of rubber and resin, p-nitrodiazoaminoazobenzene can be used as a foaming agent. The gas generated by its decomposition can form porous structures in rubber and resin during processing, thereby improving their physical properties.
This porous structure can enhance the elasticity, impact resistance, and thermal insulation properties of rubber and resin.
(2) Potential applications:
With the deepening of research on the properties of nitrobenzenediazoaminoazobenzene and the advancement of technology, its applications in fields such as medicine and pesticides are also constantly being explored.
Cadion, as an important organic chromogenic reagent, has a wide range of applications in the field of analytical chemistry. Especially in the determination of cadmium, nitrodiazoaminoazobenzene exhibits high sensitivity and selectivity, becoming an effective method for determining cadmium content in environmental water samples.
The principle of color reaction between p-nitrodiazoaminoazobenzene and cadmium
The color reaction between p-nitrodiazoaminoazobenzene and cadmium is based on the principle of complexation reaction. Under specific pH values and the presence of surfactants, cadmium ions form stable complexes with p-nitrodiazoaminoazobenzene, which exhibit specific colors, enabling quantitative analysis of cadmium.
The specific reaction process is as follows:
(1) Formation of complex:
In the presence of surfactant Triton X-60, cadmium ions (Cd ² ⁺) react with p-nitrodiazoaminoazobenzene (p-Nitrodiazoaminoazobenzene) in a pH 10.3 NH4Cl-NH3 · H2O buffer solution to form a stable deep red complex. The maximum absorption wavelength of the complex is located at 480 nm, with an apparent molar absorptivity of 8.17 × 10 ⁴ L · mol ⁻¹ · cm ⁻¹.
(2) The applicability of Beer's law:
When the cadmium concentration ranges from 80 to 320 μ g/L, the absorbance of the complex shows a linear relationship with the cadmium concentration, which conforms to Beer's law. This characteristic makes the method suitable for quantitative analysis of cadmium.
Reaction conditions
In order to facilitate the color reaction of p-nitrodiazoaminoazobenzene with cadmium and achieve optimal sensitivity and accuracy, it is necessary to strictly control the reaction conditions:
PH value:
The pH value of the solution has a significant impact on the color reaction. In a pH 10.3 NH4Cl-NH3 · H2O buffer solution, the reaction between cadmium ions and p-nitrodiazoaminoazobenzene is the most stable.
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Surfactant:
The presence of surfactant Triton X-60 can stabilize the complex, prevent its aggregation or decomposition, thereby improving the sensitivity and stability of the reaction.
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Temperature:
Although the effect of temperature on color reaction is not as significant as pH and surfactants, appropriate temperature control (usually at room temperature) can help the reaction proceed smoothly.
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Reaction time:
The color reaction requires a certain amount of time to reach equilibrium. In practical operation, it should be ensured that the reaction time is long enough to fully form stable complexes.
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Interference factors and elimination methods
During the color reaction process, there may be interference from other metal ions. These interfering ions may affect the formation and stability of complexes, thereby affecting the accuracy of the measurement results.
Therefore, appropriate measures need to be taken to eliminate these interferences.
Interference ions:
Metal ions such as nickel, mercury, and copper have serious interference with the determination of cadmium. These ions may form competitive complexes with p-nitrodiazoaminoazobenzene, thereby reducing the sensitivity of cadmium determination.
Elimination method:
To eliminate these interfering ions, thiourea sodium citrate ammonium fluoride can be used as a mixed masking agent. These masking agents can form stable complexes with interfering ions, thereby preventing their reaction with p-nitrodiazoaminoazobenzene.
Application examples
The color reaction between cadion and cadmium has been widely used in the determination of cadmium in environmental water samples. Here is a typical application example:
Sample collection and pretreatment:
Collect water samples from the test environment and perform appropriate pretreatment (such as filtration, dilution, etc.) to remove suspended solids and interfering substances.
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Color reaction:
Add an appropriate amount of p-nitrodiazoaminoazobenzene and surfactant Triton X-60 to the pre treated water sample, adjust the pH of the solution to 10.3, and react at room temperature for a period of time.
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Luminescence measurement:
Use a spectrophotometer to measure the absorbance of the complex at a wavelength of 480 nm. Based on the linear relationship between absorbance and cadmium concentration, the cadmium content in the water sample can be calculated.
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Result analysis:
Compare the measurement results with standard methods such as atomic absorption spectroscopy to verify the accuracy and reliability of the method.
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Related analysis methods
In addition to the nitrodiazoaminoazobenzene spectrophotometric method, there are various other methods that can be used for the determination of cadmium. These methods each have their own advantages and disadvantages, and are suitable for different application scenarios.
(1) Atomic absorption spectroscopy:
This method determines the content of cadmium atoms by measuring their absorption of specific wavelengths of light. It has the advantages of high sensitivity and good selectivity, but the equipment is expensive and the operation is complex.
(2) Inductively Coupled Plasma Mass Spectrometry (ICP-MS):
This method uses inductively coupled plasma to ionize elements in the sample, and separates and detects them through a mass spectrometer. It has the advantages of simultaneous determination of multiple elements, high sensitivity, and good accuracy, but also requires expensive equipment and professional operational skills.
(3) Electrochemical methods:
Such as anodic stripping voltammetry, ion selective electrode method, etc. These methods determine the content of cadmium ions by measuring their oxidation-reduction reactions on the electrode. It has the advantages of easy operation and simple equipment, but its sensitivity is relatively low and it is susceptible to interference.
(4) Other spectrophotometric methods:
In addition to the p-nitrodiazoaminoazobenzene spectrophotometric method, there are various other color reagents that can be used for the determination of cadmium. Such as o-carboxyphenyldiazoaminoazobenzene, 2-chloro-4-nitrophenyldiazoaminoazobenzene, etc. The selection of these methods depends on specific application requirements and experimental conditions.
adverse reaction
Cadion (p-nitrophenyldiazoaminoazobenzene, CAS number 5392-67-6) is a chemical chromogenic reagent commonly used for the detection of metal ions such as cadmium and magnesium. Its adverse reactions mainly involve irritating reactions to the skin, eyes, and respiratory system, as well as potential systemic allergy risks.
Local stimulus response
Skin
Contact dermatitis: erythema, itching, blisters, and in severe cases, ulcers or necrosis may occur.
Allergic reactions: Repeated exposure may cause delayed type hypersensitivity reactions (type IV), manifested as eczema like rashes.
Case: After operating Cadion without wearing gloves, a laboratory staff member developed diffuse erythema on their palms accompanied by severe itching, which was diagnosed as contact allergy through patch testing.
eye
Irritable conjunctivitis: conjunctival congestion, tearing, photophobia, and in severe cases, corneal epithelial damage.
Data: Animal experiments have shown that 5% Cadion solution eye drops can cause corneal opacity in rabbits.
Respiratory tract
Inhalation irritation: Short term exposure to high concentrations of dust can cause coughing, chest tightness, difficulty breathing, similar to asthma attacks.
Long term effects: Chronic exposure may damage respiratory mucosa and increase the risk of infection
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