137823-33-7

Basic information

• Product Name: tris(triethylsilyl) arsenate
• CAS NO: 137823-33-7
• Molecular Formula: C₁₈H₄₅AsO₄Si₃
• Molecular Weight: 484.7256
• Mol File: 137823-33-7.mol
• Article Data: 1

Chemical Properties

• Boiling Point: 429.4°C at 760 mmHg
• Flash Point: 177.4°C
• Vapor Pressure: 3.53E-07mmHg at 25°C
• CAS DataBase Reference: tris(triethylsilyl) arsenate(CAS DataBase Reference)
• NIST Chemistry Reference: tris(triethylsilyl) arsenate(137823-33-7)
• EPA Substance Registry System: tris(triethylsilyl) arsenate(137823-33-7)

Safety Data

• Hazardous Substances Data: 137823-33-7(Hazardous Substances Data)

Upstream product

• 2117-18-2 bis(triethylsilyl)amine 
• 994-30-9 triethylsilyl chloride 

Relevant articles and documents

Arsenosiloxanes: Formation and Decomposition of Trialkylsilyl Arsenates und Arsenites

Tris(trialkylsilyl) arsenates(V) are prepared from silver arsenate(V) and chlorotrialkylsilanes or from arsenic acid and hexaalkyldisilazanes.The triethylsilyl ester 1b is stable, but the trimethylsilyl ester 1a undergoes condensation at ambient temperature to give hexamethyldisiloxane and trimethylsilyl polyarsenates(V), including tetrakis(trimethylsilyl) diarsenate(V) (4a).According to an X-ray crystal structure determination of 4a (triclinic, space group P1) centrosymmetrical dimers are present containing two edge-sharing AsO6 octahedra with apex-bridging by two AsO4 tetrahedra. 1a is converted into the salt + CF3SO3-, the cation of which is believed to be a component of the reaction chain.There is also evidence by mass spectrometry for the existence of (Me3SiO)5As (5). - Tris(trimethylsilyl) arsenite(III) (6) is prepared from AsCl3 and NaOSiMe3.With modified stoichiometry, side reactions give also the byproducts Cl2AsOSiMe3, ClAs(OSiMe3)2, Cl2AsOAsCl2, Cl2AsOAsCl(OSiMe3), O2, and cyclic chloroarsenosiloxanes (12, 13). Key Words: Heterosiloxanes / Arsenosiloxanes / Arsenates, silyl- / Arsenites, silyl-