Arsenic pentafluoride

Chemical Name Synonyms Chemical Formula CAS number Molecular Weight Boiling point Melting point Vapor pressure (20°C) Absolute density 

Self contained breathing apparatus should be worn in confined areas or where air displacement is a possibility. 

NFPA hazard identification health U flammability 0 reactivity 2 

Exposnre limits Known carcinogen Arsenic, inorganic 10 mg/m OSHA 200mg/mACGIHTWA 2 mg/m NIOSH 15 min. ceiling 

Target effects Corrosive—inhalation, skin, eye neurotoxin, poisoning may effect skin, liver, kidneys, gastrointestinal tract, hematopoietic and cardiovascular systems. 

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Arsenic forms the binary compounds arsenous triduoride and arsenic pentafluoride, as well as a series of compounds and the acid of the very stable hexafluoroarsenate ion. 

Arsenic pentafluoride can be prepared by reaction of fluorine and arsenic trifluoride or arsenic from the reaction of NF O and As (16) from the reaction of Ca(FS02)2 and H AsO (17) or by reaction of alkaH metal or alkaline-earth metal fluorides or fluorosulfonates with H AsO or H2ASO2F (18). 

Arsenic Halides. Arsenic forms a complete series of trihaUdes, but arsenic pentafluoride is the only well-known simple pentahaUde. AH of the arsenic haUdes, the physical properties of which are given in Table 2, are covalent compounds that hydrolyze in the presence of water. The trihaUdes form pyramidal molecules similar to the trivalent phosphoms analogues and may be prepared by direct combination of the elements. 

Arsenic pentafluoride (arsenic(V) fluoride), AsF, is a colorless gas that condenses to a yellow Hquid its dielectric constant is 12.8 at 20 °C. It is formed by reaction of a mixture of bromine and antimony pentafluoride with arsenic trifluoride. The molecule is a trigonal bipyramid and is somewhat dissociated as indicated by vapor density measurements. 

No tniodoarsorane has been reported. Triduorodiphenylarsorane [2357-18-8] C22H2QASF2, has been prepared by several methods. One method involves the reaction of benzene with arsenic pentafluoride and subsequent treatment of the resulting salt with cesium fluoride (147) ... 

Seif-Tfst 3.1A Predict the shape of an arsenic pentafluoride molecule, AsF. ... 

Arsenic pentafluoride, Benzene See Arsenic pentafluoride Benzene, etc. 

Gillespie, R. J. et al., J. Chem. Soc., Chem. Comm., 1977, 595-597 Although stable at below -40°C in absence of moisture, it will explode if warmed rapidly (>20°C/h). Explosive decomposition of the solid difluoride oxide at -196°C occurs on contact with mercury, or antimony pentafluoride or arsenic pentafluoride [1], The fluoride explodes at about 0°C, and also in contact with arsenic pentafluoride in absence of hydrogen fluoride at -78°C [2],... 

ARSENIC TRI BROMIDE ARSENIC TRICHLORIDE ARSENIC TRIFLUORIDE ARSENIC PENTAFLUORIDE ARSINE... 

Sulfur atoms extraneous to the heteropentalene system in (4 X = S) can be oxidized by MCPBA to SO and SO2 groups in 64-70% yields <85JCS(P2)833>. Arsenic pentafluoride coordinates to the thiadiazole ring of (59 R = Cl) as shown in (15) (x-ray analysis) <86ZN(B)162>, whereas (rj -ethene)bis(triphenyl-phosphane)platinum(0) inserts into the thiadiazole ring to give a new six-membered metallocycle <86CB366>. 

When heated with chlorine, bromine or iodine vapors arsenic forms the corresponding trihalides however, with fluorine, arsenic pentafluoride, AsFs is produced. With sulfur it forms mixtures of sulfides, AS2S3, AS2S2 and AS2S5 in vitreous forms and varying proportions depending on the conditions of reactions. 

The trimer of cyanogen chloride, (CNClls reacts with fluorine in the presence of arsenic pentafluoride in chlorofluorocarbon solvent forming the complex [C3N3Cl3F][AsF6]. 

Arsenic pentachloride, instability of, 7 7-8 Arsenic pentafluoride, 7 2, 4, 5 chalcogen(IV) compound adducts, 35 259-261... 

When heated, polyvinyl chloride (PVC) and polyvinyl alcohol (PVA) lose HC1 and H20, respectively, to produce dark-colored conductive polyacetylene. Superior polymers of acetylene can be made by the polymerization of acetylene with Ziegler-Natta catalysts. The conductivity of polyacetylene is increased by the addition of dopants, such as arsenic pentafluoride or sodium naphthenide. 

Arsenic pentafluoride (b.p. -52.8 °C) is the only stable well-characterized arsenic(V) halide. Electron diffraction49 shows it to be a trigonal bipyramidal molecule, with equatorial d As—F) 1.656 A and axial d(As—F) 1.711 A 19F NMR shows that the five fluorines are equivalent. The apparent inconsistency displayed by the two techniques is due to the differing time scales of the measured effects. On the slower NMR time scale the axial-equatorial bonds rotate via a square pyramidal intermediate resulting in the observed equivalence (pseudorotation). 

Arsenic pentafluoride is a Lewis acid capable of forming adducts with basic molecules, e.g. (23), the adduct with TV-methyl-S,5-difluorosulfoximine.59 Neglecting the methyl group there is a mirror plane through F(ax),As,N,S,0. The methyl C atom lies ca. 0.05 A out of this plane ... 

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