Chloroauric acid

• CAS: 16903-35-8
• Catalog Number: ACM16903358-1
• Category: Metal & Ceramic Materials
• Molecular Weight: 339.79
• Molecular Formula: HAuCl4
• Synonyms: Hydrogen tetrachloroaurate(III) solution
• Boiling Point: 100 °C
• Melting Point: 30 °C
• Density: 3.9 g/mL at 25 °C (lit.)
• Solubility: Miscible with water, alcohol, ester, ether and ketone
• Appearance: Yellow liquid
• Application: Chlorine acid is mainly used for alkaloid determination, electroplating gold, photography, gold powder, porcelain coloring, red glass manufacturing, special ink and treatment of tuberculosis. It can also be used as analytical reagent, such as microanalysis of rubidium (Rb) and cesium (Cs). It is used for semiconductor, electronic connector and local gold-plated of integrated circuit lead frame, also for printing circuit boards.The HCl plus the HNO2; (hydrochloric and nitric acids) are combined to produce agua regia acid, which is the only; acid that can dissolve gold.
• Storage: 2-8 °C
• Hazard Statements: H302-H314-H317
• MDL Number: MFCD00149903
• Safety Description: Danger
• Symbol: GHS05, GHS07
• UN Number: UN 3260 8 / PGIII

Case Study

In-Situ Reduction of Chloroauric Acid to Prepare Au@COPN Catalyst

Dursun S, et al. RSC advances, 2019, 9(66), 38538-38546.

Covalent organic polymer networks (COPN) are used as catalyst supports due to their stable and good structure. The simple synthesis of gold nanoparticles embedded in triazine-based covalent organic polymer networks (Au@COPN-1) was achieved by in situ reduction of gold ions in chloroauric acid (HAuCl4).
Synthetic route for in situ reduction of chloroauric acid
· COPN-1 was first synthesized through the reaction of tris(2,3-epoxypropyl)isocyanurate and melamine.
· Add gold (III) chloride trihydrate (10 mg, 0.0254 mmol) in 1 mL of distilled water dropwise to the COPN-1 solution under continuous stirring, and stir for 12 hours.
· Insert the flask containing the mixture of HAuCl4 ·3H2O and COPN-1 into an oil bath at 100°C. After heating for 3 hours, the mixture was cooled to room temperature. The crude product was washed and dried to obtain a dark red solid product.

Chloroauric Acid Reacts with Histidine in Microdroplets to Produce Catalytically Active Substances

Luo K, et al. Chemical Science, 2020, 11(9), 2558-2565.

An electroacoustic spray ionization (ESSI) strategy can be used to prepare the catalytically active species Au-(His)2 from the droplet reaction of chloroauric acid and histidine. Furthermore, microdroplet reaction using Au-(His)2 complex as catalyst was scaled up by room temperature ultrasonic atomization.
· Electroacoustic spray ionization (ESSI)
A sample solution containing histidine (100 μM) and chloroauric acid (10 μM) was sprayed from the fused silica capillary tip of the nebulizer and supplemented with dry N2 nebulizing gas at a pressure of 120 psi. The aqueous droplet reaction of chloroauric acid and histidine produces a transient intermediate in which Au bridges two histidine ligands, namely Au-(His)2.
· Ultrasonic atomization droplets
Inject HAuCl4 (10 mM, 100 μL) and histidine (100 mM, 100 μL) solutions into a UN pool containing 900 μL aqueous solution. The reaction time is 12 minutes to generate Au-(His)2 complex. Then, solutions of phenylacetylene (200 mM, 100 μL) and indoline (100 mM, 100 μL) in acetonitrile were added to the same glass spray cell for further ultrasonic atomization to induce in situ catalysis of the enamine reaction.

Custom Q&A

What is the molecular weight of Chloroauric acid?

The molecular weight of Chloroauric acid is 339.79.

What are the product categories of Chloroauric acid?

The product categories of Chloroauric acid include chemical reaction, pharm, electronic, materials, metal acid halide, and more.

What is the color of Chloroauric acid?

Chloroauric acid is yellow in color.

What are the synonyms for Chloroauric acid?

The synonyms for Chloroauric acid include Hydrogen tetrachloroaurate(III) solution, auric acid, tetrachloroauric, and more.

Is Chloroauric acid soluble in water?

Yes, Chloroauric acid is soluble in water.

At what temperature does Chloroauric acid decompose into gold trichloride?

Chloroauric acid decomposes into gold trichloride at 120°C.

How is Chloroauric acid mainly used?

Chloroauric acid is mainly used for electroplating gold, photography, gold powder, porcelain coloring, red glass manufacturing, and treatment of tuberculosis.

What acid is used to dissolve gold to form Chloroauric acid?

Hydrochloric and nitric acids are combined to produce aqua regia acid, which can dissolve gold to form Chloroauric acid.

How is Chloroauric acid prepared?

Chloroauric acid is prepared by dissolving pure gold in aqua regia (or hydrochloric acid saturated by chlorine gas), followed by distillation and crystallization.

What role does Chloroauric acid play in the preparation of gold compounds?

Chloroauric acid acts as a key starting material for the preparation of gold compounds and also plays a role as a catalyst in various reactions.