Cupferron

Cupferron (CAS 135-20-6): A Comprehensive Introduction

Cupferron, with the CAS number 135-20-6, is a chemical compound that has found wide – ranging applications in various industries. In this detailed introduction, we will explore its basic information, physical and chemical properties, uses, applications in different fields, and the methods of its preparation.

Basic Information

Cupferron, also known as Ammonium N – nitrosophenylhydroxylamine, has a molecular formula of C₆H₉N₃O₂ and a molecular weight of approximately 155.15 g/mol. It is an organic salt that is commonly used in analytical chemistry and other industrial processes. The compound appears as a white to pale – yellow crystalline powder under normal conditions. It has a characteristic odor, although it is not extremely pungent. Cupferron is soluble in water to a certain extent, and its solubility is influenced by factors such as temperature and pH.

Physical and Chemical Properties

Physically, Cupferron has a melting point in the range of 150 – 152 °C. When heated above its melting point, it may decompose, releasing potentially hazardous nitrogen – containing compounds. Its density is around 1.25 g/cm³. Chemically, Cupferron is a reducing agent due to the presence of the N – nitroso group. It can react with various metal ions to form insoluble complexes. For example, it reacts with copper(II) ions to form a copper – Cupferron complex that can be used for the separation and determination of copper in analytical samples. The reaction mechanism involves the donation of electrons from the Cupferron molecule to the metal ion, resulting in the formation of a stable coordination compound.

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Cupferron Uses

One of the primary uses of Cupferron is in analytical chemistry. It is widely employed as a precipitating agent for the determination of metals such as copper, iron, aluminum, and titanium. In a typical analytical procedure, a solution containing the metal ions of interest is treated with a solution of Cupferron. The metal – Cupferron complexes precipitate out of the solution, and they can be filtered, washed, and then analyzed using various techniques such as gravimetry or spectroscopy. This method provides a highly selective and sensitive way to determine the concentration of these metals in complex samples.

Cupferron is also used in the separation of metals from mixtures. By carefully controlling the reaction conditions, different metal – Cupferron complexes can be formed and separated based on their solubility differences. This is particularly useful in the purification of metals and in the analysis of ores and alloys.

In addition, Cupferron has some applications in the field of organic synthesis. It can be used as a reagent to introduce specific functional groups into organic molecules. For example, it can react with certain organic compounds to form N – nitroso derivatives, which can be further transformed into other useful compounds through subsequent chemical reactions.

Applications in Different Fields

Metallurgy

In the metallurgical industry, Cupferron plays a crucial role in the analysis and purification of metals. In the analysis of ores, it helps to accurately determine the content of valuable metals such as copper and iron. This information is essential for the economic evaluation of ore deposits and the optimization of the extraction process. In the purification of metals, Cupferron can be used to remove impurities by forming insoluble complexes with them, which can then be separated from the metal of interest.

For example, in the production of high – purity copper, Cupferron can be used to precipitate out trace amounts of other metals such as iron and aluminum, ensuring the quality of the final copper product.

Environmental Science

In environmental science, Cupferron is used for the analysis of metal pollutants in water and soil samples. By measuring the concentration of metals such as lead, cadmium, and mercury using Cupferron – based analytical methods, scientists can assess the level of environmental pollution and develop appropriate remediation strategies. For instance, in the study of contaminated water bodies, Cupferron can be used to determine the amount of heavy metals present, which is important for understanding the impact on aquatic life and human health.

Biomedical Research

Although its use in biomedical research is relatively limited compared to other fields, Cupferron has shown some potential in certain areas. Some studies have investigated its role as a potential anti – tumor agent due to its ability to interact with metal ions in biological systems. Metal ions are involved in many important biological processes, and by interfering with their normal function, Cupferron may have an impact on the growth and survival of cancer cells. However, more research is needed to fully understand its mechanism of action and its potential therapeutic applications.

Preparation Methods

There are several methods for the preparation of Cupferron. One of the common methods involves the reaction between phenylhydroxylamine and nitrous acid in the presence of ammonia.

The first step is the generation of nitrous acid, which is usually done by reacting sodium nitrite with a dilute acid such as hydrochloric acid. Then, phenylhydroxylamine is added to the nitrous acid solution. The reaction between phenylhydroxylamine and nitrous acid forms N – nitrosophenylhydroxylamine. Finally, ammonia is added to the solution to form the ammonium salt, which is Cupferron.

The reaction equations are as follows:
1. NaNO₂ + HCl → HNO₂+ NaCl
2. C₆H₅NHOH + HNO₂ → C₆H₅N(NO)OH + H₂O
3. C₆H₅N(NO)OH+ NH₃ → C₆H₅N(NO)ONH₄

Another method involves the reaction of nitrobenzene with zinc dust and hydrochloric acid to form phenylhydroxylamine, followed by the same steps of nitrosation and salt formation as described above. This method requires more steps but can be a viable option depending on the availability of starting materials.