353-66-2

Basic information

• Product Name: DIMETHYLDIFLUOROSILANE
• Synonyms: (CH3)2SiF2;difluorodimethyl-silan;DIFLUORODIMETHYLSILANE;DIMETHYLDIFLUOROSILANE;Dimethyldifluorosilane, tech;EINECS 206-540-5;Difluorodimethylsilane, tech. 85%
• CAS NO: 353-66-2
• Molecular Formula: C₂H₆F₂Si
• Molecular Weight: 96.15
• EINECS: 206-540-5
• Mol File: 353-66-2.mol
• Article Data: 27

Chemical Properties

• Melting Point: -88°C
• Boiling Point: 2-3°C
• Flash Point: <0°C
• Appearance: /
• Density: 0.888 g/cm³
• Vapor Pressure: 1550mmHg at 25°C
• Refractive Index: 1.302
• CAS DataBase Reference: DIMETHYLDIFLUOROSILANE(CAS DataBase Reference)
• NIST Chemistry Reference: DIMETHYLDIFLUOROSILANE(353-66-2)
• EPA Substance Registry System: DIMETHYLDIFLUOROSILANE(353-66-2)

Safety Data

• Hazard Codes: F
• Statements: 12-34
• Safety Statements: 9-16-26-36/37/39-45
• RIDADR: 3309
• TSCA: Yes
• Hazardous Substances Data: 353-66-2(Hazardous Substances Data)

Usage

General Description

Dimethyldifluorosilane is a chemical compound with the formula (CH3)2SiF2. It is a colorless, flammable gas with a pungent odor, and is mainly used as a precursor in the production of silicon-based materials and compounds. Dimethyldifluorosilane is commonly used in the semiconductor industry for the deposition of silicon dioxide and silicon nitride thin films by chemical vapor deposition (CVD). It is also used in the production of silicone polymers and as a reagent in organic synthesis. The chemical is highly reactive and should be handled with caution due to its flammability and potential to form toxic byproducts when it reacts with air or water.

InChI:InChI=1/C2H6F2Si/c1-5(2,3)4/h1-2H3

Upstream product

• 75-78-5 dimethylsilicon dichloride 
• 1627-98-1 1,1,3,3-tetramethyl-1,3-disiletane 
• 3277-26-7 1,1,3,3-Tetramethyldisiloxane 
• 661-68-7 1,2-difluoro-1,1,2,2-tetramethyl-disilane 
• 754-25-6 trimethyl(trifluoromethyl)tin 
• 556-67-2 octamethylcyclotetrasiloxane 
• 420-56-4 trimethylsilyl fluoride 
• 1112-39-6 dimethyldimethoxysilan 
• 52686-74-5 methoxydimethylfluorosilane 
• 3768-58-9 bis(dimethylamino)dimethylsilane 
• 661-62-1 Dimethyl-N-dimethylamino-fluor-silan 
• 3860-91-1 Dimethyl-bis-methylsulfanyl-silane 
• 373-74-0 methyltrifluorosilane 
• 271772-12-4 methylfluorodimethoxysilane 

Downstream Products

• 83312-36-1 1-(Fluoro-dimethyl-silanyl)-2,2,4,4-tetraisopropyl-[1,3,2,4]diazadisiletidine 
• 83312-37-2 1,3-Bis-(fluoro-dimethyl-silanyl)-2,2,4,4-tetraisopropyl-[1,3,2,4]diazadisiletidine 
• 420-56-4 trimethylsilyl fluoride 
• 1112-39-6 dimethyldimethoxysilan 
• 3768-58-9 bis(dimethylamino)dimethylsilane 
• 373-74-0 methyltrifluorosilane 
• 52686-74-5 methoxydimethylfluorosilane 
• 271772-12-4 methylfluorodimethoxysilane 
• 271772-13-5 methyldifluoromethoxysilane 
• 1639345-42-8 3-cyanopropyldimethylfluorosilane 
• 65768-31-2 N-(Fluordimethylsilyl)-2,4-6-trimethylanilin 
• 67142-02-3 C₁₆H₃₆BFN₄Si₄ 
• 1570054-11-3 [bis(triphenyl-λ⁵-phosphanylidene)ammonium][Me2SiF3] 
• 70557-59-4 C₁₆H₂₂F₂N₂Si₂ 

Relevant articles and documents

Synthesis of alkyl fluorosilanes by the reaction of alkyl chlorosilanes with pyridinium poly(hydrogen fluoride) at room temperature

Dimethyl difluorosilane (DFS) has been prepared in high yield (80-90percent) by the reaction of dimethyl dichloro-silane with pyridinium poly(hydrogen fluoride) at room temperature (25-35 deg C).The gas has been characterised by IR and 19F NMR spectroscopy, molecular weight measurements and elemental analysis.The method has been extended to the preparation in high yields of monomethyl and trimethyl fluorosilanes.

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NONAQUEOUS ELECTROLYTE COMPOSITIONS COMPRISING SILYL OXALATES

Disclosed herein are electrolyte compositions comprising a fluorinated solvent, at least one silyl oxalate represented by the formulas RR′Si(C2O4), wherein R and R′ are each the same or different from each other and independently selected from C1-C8 alkyl, C2-C8 alkenyl, C2-C8 alkynyl, or C6-C10 aryl radical, optionally comprising at least one substituent selected from halogen, hydroxyl, alkoxy, carbonyl, and carboxyl groups; and LiPF6. Also disclosed herein are electrolyte compositions comprising a fluorinated solvent and a lithium oxalato phosphate salt represented by the formula LiPF(6-2q)(C2O4)q, wherein q is 1, 2 or 3; wherein the oxalato phosphate salt comprises at least a portion that is derived from at least one silyl oxalate as defined herein. The electrolyte compositions are useful in electrochemical cells, such as lithium ion batteries.

Thermal and hydrolytic decomposition mechanisms of organosilicon electrolytes with enhanced thermal stability for lithium-ion batteries

The high flammability and thermal instability of conventional carbonate electrolytes limit the safety and performance of lithiumion batteries (LIBs) and other electrochemical energy storage devices. Organosilicon solvents have shown promise due to their reduced flammability and greater chemical stability at high temperatures. A series of organosilicon electrolytes with different functional substituents were studied to understand the structural origins of this enhanced stability. The thermal and hydrolytic stability of organosilicon and carbonate solvents with LiPF6 was probed by storage at high temperatures and with added water. Quantitative monitoring of organosilicon and carbonate electrolyte decomposition products over time using NMR spectroscopy revealed mechanisms of degradation and led to the discovery of a key PF5-complex that forms in organosilicon electrolytes to inhibit further salt breakdown. Increased knowledge of specific structural contributions to electrolyte stability informs the development of future electrolyte solvents to enable the safer operation of high-performing lithium-ion batteries.