Copper hexafluorosilicate hydrate

• CAS: 12062-24-7
• Catalog Number: ACM12062247
• Category: Main Products
• Molecular Weight: 205.62
• Molecular Formula: CuF6Si
• Synonyms: copper fluorosilicate
• IUPAC Name: CUPRIC FLUOROSILICATE
• Boiling Point: 19.5ºC at 760 mmHg
• Appearance: white powder/ colorless liquid
• Application: Copper hexafluorosilicate hydrate is a chemical compound that consists of blue, hygroscopic crystals. It is decomposed by heat and is soluble in water, with slight solubility in alcohol. This product is commonly used for dyeing and hardening white marble, as well as for treating grapevines affected by "white disease."
• Exact Mass: 204.89700

Case Study

Development of a Flame-Retardant Composite Coating Based on Copper Hexafluorosilicate Modification

Mykhalichko B, et al. Period. Polytech. Chem. Eng., 2022, 66(2), 304-312.

This work developed a novel flame-retardant coating for wood based on copper hexafluorosilicate (CuSiF6)-modified epoxy-amine composite. Compared with the unmodified epoxy-amine composite, the maximum temperature of the combustion gas of the CuSiF6-modified epoxy-amine composite was reduced by 204-327 °C, and the mass loss during combustion was reduced by 7.8-10.4%. In addition, the fire-retardant coating was applied to wood for fire tests, and the results showed that its flame retardant efficiency (FPE) could reach group I (flame retardant efficiency index ≤ 9 %).
Preparation of CuSiF6 modified flame-retardant composite coating
· The first method involves obtaining the polymer sample by mixing the flame retardant-hardener and the binder, namely the [Cu(eda) (deta)]SiF6 chelate complex with ED-20, until a dark blue thick mass is formed. This resulting polymer sample is denoted as ED/pepa/CuSiF6 (II).
· In the second method, ED-20 and pepa are stirred together for 5-10 minutes in specific ratios. Then, anhydrous copper(II) hexafluorosilicate is added to the mixture and stirred until a uniform consistency is achieved. The color change from light yellow to dark blue after adding CuSiF6 indicates the formation of the [Cu(eda)(deta)]SiF6 chelate complex due to the bonding of the inorganic copper(II) salt with pepa during the curing process of the composites.

CuSiF6 Used in the Sequential One-Step Synthesis Strategy for M-XF6-Based MOF Materials

Guillerm, Vincent, et al. Chemistry-A European Journal, 2017, 23(28), 6829-6835.

This work demonstrates the continuous, one-step spray-drying (SD) synthesis of several members of this isoreticular MOF family, which differ in their anion pillars (XF6=[SiF6]2- and [TiF6]2-), N-donating organic ligands (pyrazine and 4,4'-bipyridine), and metal ions (M=Co, Cu, and Zn). These synthesized M-XF6-based MOFs can be considered as "ready-to-use" adsorbents for CO2 and N2 adsorption. In the synthetic example of SIFSIX-3-Cu, copper hexafluorosilicate hydrate was used as the anion pillar.
Synthesis procedure of SIFSIX-3-Cu
· The one-step SD synthesis involved atomizing two methanolic solutions at 85 °C, one containing M-SiF6 (M = Co, Cu, Zn) and the other containing pyrazine (pyz), resulting in fine powders that were collected with minimal methanol (MeOH) to prevent air sensitivity.
· In the case of SIFSIX-3-Cu, a 6 mL methanolic solution of 300 mg (1.34 mmol) of CuSiF6·H2O and a 6 mL methanolic solution of 325 mg (4.05 mmol) of pyz were simultaneously spray-dried under specific conditions to produce a blue powder of SIFSIX-3-Cu. The powder was then collected with a minimal amount of MeOH (272 mg; 55% yield based on Cu).
· To evaluate the CO2 sorption properties of the as-made SIFSIX-3-M MOFs, their performance was compared to that of their bulk counterparts. The SD-synthesized SIFSIX-3-M powders collected in methanol were directly transferred to sorption cells, dried, and evacuated for 12 hours at 65 °C before measuring their CO2 uptake at 298 K.