2,4 - Dimethylaniline, also known as 2,4 - Xylidine, is a significant organic compound with diverse applications in the chemical industry. As a reliable supplier of 2,4 - Dimethylaniline, I often encounter inquiries regarding its physical and chemical properties, with the melting point being a common question. In this blog post, I will delve into the melting point of 2,4 - Dimethylaniline, its influencing factors, and its relevance in various industrial processes.
Understanding the Melting Point of 2,4 - Dimethylaniline
The melting point of a substance is the temperature at which it changes from a solid to a liquid state at a given pressure. For 2,4 - Dimethylaniline, the melting point is approximately -14 °C. This relatively low melting point indicates that 2,4 - Dimethylaniline is a liquid at room temperature under normal atmospheric conditions. The low melting point is attributed to the molecular structure of 2,4 - Dimethylaniline. The compound consists of a benzene ring with two methyl groups (-CH₃) and an amino group (-NH₂) attached at the 2 and 4 positions respectively. The presence of these substituents disrupts the regular packing of the molecules in the solid state, reducing the intermolecular forces and thus lowering the melting point.
Factors Affecting the Melting Point
Purity
The purity of 2,4 - Dimethylaniline has a significant impact on its melting point. Impurities can act as defects in the crystal lattice, preventing the molecules from packing efficiently. As a result, the intermolecular forces are weakened, and the melting point is lowered. A pure sample of 2,4 - Dimethylaniline will have a sharp melting point close to the reported value of -14 °C. In contrast, a sample with impurities will have a broader melting range, starting at a lower temperature.
Pressure
Although the effect of pressure on the melting point of 2,4 - Dimethylaniline is relatively small under normal conditions, it can still be a factor in high - pressure industrial processes. According to the Clausius - Clapeyron equation, an increase in pressure generally raises the melting point of substances that expand upon melting. However, for most organic compounds like 2,4 - Dimethylaniline, the change in volume upon melting is small, so the pressure effect is usually negligible.
Applications Related to the Melting Point
Chemical Synthesis
The low melting point of 2,4 - Dimethylaniline makes it easy to handle in liquid form during chemical synthesis. It can be readily mixed with other reactants, facilitating homogeneous reactions. For example, 2,4 - Dimethylaniline is used as an intermediate in the synthesis of dyes, pesticides, and pharmaceuticals. Its liquid state at room temperature allows for smooth addition to reaction vessels and efficient mixing with other reagents, which is crucial for achieving high - quality products.
Solvent and Extraction Processes
The physical state of 2,4 - Dimethylaniline at room temperature also makes it suitable for use as a solvent or in extraction processes. Its relatively low melting point means that it can be easily incorporated into various solvent systems. It can dissolve a wide range of organic compounds, making it useful for extracting specific components from mixtures.
Comparison with Similar Compounds
Hexamethyldisilazane HMDS
Hexamethyldisilazane HMDS is another important chemical compound in the industry. Unlike 2,4 - Dimethylaniline, HMDS has a much lower melting point of around -78 °C. The large difference in melting points is due to the difference in molecular structure. HMDS is a silicon - containing compound with a more flexible and less polar structure compared to 2,4 - Dimethylaniline. The weak intermolecular forces in HMDS result in a very low melting point, which makes it a useful reagent in low - temperature reactions and as a silylating agent.
2 - Nitroaniline
2 - Nitroaniline has a significantly higher melting point than 2,4 - Dimethylaniline. The melting point of 2 - Nitroaniline is around 71 - 73 °C. The nitro group (-NO₂) in 2 - Nitroaniline is highly polar and can form strong intermolecular interactions such as dipole - dipole forces and hydrogen bonding. These strong intermolecular forces lead to a more ordered solid - state structure and a higher melting point.
Quality Control and Assurance in Supply
As a supplier of 2,4 - Dimethylaniline, ensuring the quality of the product is of utmost importance. We conduct rigorous quality control measures to guarantee that our 2,4 - Dimethylaniline meets the highest standards. Our quality control team uses advanced analytical techniques such as gas chromatography (GC) and melting point determination to assess the purity of the product. By accurately measuring the melting point, we can detect any impurities and ensure that the product has the desired physical properties.
Relevance in the Supply Chain
The melting point of 2,4 - Dimethylaniline is also relevant in the supply chain. Since it is a liquid at room temperature, it can be easily transported and stored in standard containers. However, proper handling is still required to prevent exposure to air, moisture, and other contaminants that could affect its quality. Our company has established a reliable supply chain system to ensure that the product is delivered to our customers in a timely and efficient manner while maintaining its quality.
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Conclusion
In conclusion, the melting point of 2,4 - Dimethylaniline is an important physical property that is influenced by factors such as purity and pressure. Its low melting point at -14 °C makes it a convenient and versatile compound in various industrial applications, including chemical synthesis and solvent processes. As a supplier, we are committed to providing high - quality 2,4 - Dimethylaniline that meets the strictest industry standards. If you are interested in purchasing 2,4 - Dimethylaniline or have any questions about its properties and applications, please feel free to contact us for further discussion and procurement negotiation.
References
- "Organic Chemistry" by Paula Yurkanis Bruice
- Chemical databases and literature on 2,4 - Dimethylaniline properties and applications.