Copper(II) oxalate
Overview
Copper(II) oxalate is an inorganic compound consisting of copper cations (Cu²⁺) and oxalate anions (C2O4²⁻). It is typically produced by reacting copper salts with oxalic acid in aqueous solutions. The compound is valued in industrial applications for its role as a precursor to other copper-based materials and catalysts. As a high-purity material, copper(II) oxalate finds particular use in specialized chemical processes where impurity control is critical. Its thermal decomposition properties make it useful for producing fine copper powders and copper oxide coatings through controlled calcination processes.
Physical and Chemical Properties
Copper(II) oxalate appears as a light blue crystalline powder that is insoluble in water but dissolves in mineral acids. The compound undergoes thermal decomposition at relatively low temperatures (starting around 200°C) to form copper oxide, carbon dioxide, and carbon monoxide. The material exhibits diamagnetic properties due to the d⁹ electron configuration of copper(II) ions. In its anhydrous form, it crystallizes in the monoclinic system. When heated carefully, it can serve as a source of highly pure copper or copper oxide materials, as the decomposition process leaves minimal residues.
Main Applications
The primary industrial use of copper(II) oxalate is as a precursor for copper-based catalysts, particularly for organic synthesis and oxidation reactions. It serves as an intermediate in the production of specialty copper compounds used in electronics and ceramics. In the pigment industry, copper(II) oxalate contributes to certain blue and green color formulations. The compound also finds niche applications in pyrotechnics and as a component in some types of gas sensors. Recent research explores its potential in battery technologies and as a component in metal-organic frameworks (MOFs).
Safety and Storage
Copper(II) oxalate requires careful handling due to its toxicity. Personal protective equipment including gloves, goggles, and dust masks should be worn when handling the powder. The compound is classified as harmful if swallowed or inhaled, and it can cause skin and eye irritation. For storage, keep containers tightly sealed in a cool, dry place away from oxidizing agents. The material should be stored separately from food and feedstuffs. Spills should be cleaned up immediately with appropriate protective measures, and disposal should comply with local environmental regulations for heavy metal compounds.
B2B Procurement Guide
When sourcing copper(II) oxalate for industrial applications, buyers should specify purity requirements (typically 98-99.9%), particle size distribution, and moisture content. Technical grade is commonly available at lower costs, while reagent grade commands higher prices but offers greater consistency. Suppliers often provide this compound in 25kg fiber drums or custom quantities. Lead times may vary depending on purity specifications and order volume. For consistent quality, establish long-term relationships with manufacturers who can provide certificates of analysis and material safety data sheets with each shipment.
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