Bismuth pentafluoride

In a generalized sense, acids are electron pair acceptors. They include both protic (Bronsted) acids and Lewis acids such as AlCb and BF3 that have an electron-deficient central metal atom. Consequently, there is a priori no difference between Bronsted (protic) and Lewis acids. In extending the concept of superacidity to Lewis acid halides, those stronger than anhydrous aluminum chloride (the most commonly used Friedel-Crafts acid) are considered super Lewis acids. These superacidic Lewis acids include such higher-valence fluorides as antimony, arsenic, tantalum, niobium, and bismuth pentafluorides. Superacidity encompasses both very strong Bronsted and Lewis acids and their conjugate acid systems. 

Bismuth Penta.fIuoride, Bismuth(V) fluoride consists of long white needles that have been shown to have the same stmcture as the body-centered, tetragonal a-polymorph of uranium hexafluoride. The density of the soHd is 5.4 g/mL at 25°C. The soHd consists of infinite chains of trans-bridged BiF polyhedra dimers and trimers are present in the vapor phase (22). Bismuth pentafluoride may be prepared by the fluorination of BiF or... 

Bismuth pentafluoride is an active fluorinating agent. It reacts explosively with water to form ozone, oxygen difluoride, and a voluminous chocolate-brown precipitate, possibly a hydrated bismuth(V) oxyfluoride. A similar brown precipitate is observed when the white soHd compound bismuth oxytrifluoride [66172-91 -6] BiOF, is hydrolyzed. Upon standing, the chocolate-brown precipitate slowly undergoes reduction to yield a white bismuth(Ill) compound. At room temperature BiF reacts vigorously with iodine or sulfur above 50°C it converts paraffin oil to fluorocarbons at 150°C it fluorinates uranium tetrafluoride to uranium pentafluoride and at 180°C it converts Br2 to bromine trifluoride, BrF, and bromine pentafluoride, BrF, and chlorine to chlorine fluoride, GIF. It apparently does not react with dry oxygen. 

Bismuth ligands, 2,989-1061 bonding, 2,1030-1041 7i bonding, 2, 1033-1039 trigonal bipyramidal complexes, 2,1036 Bismuth line, 3,294 Bismuthotungstates, 3, 1042 Bismuth pentafluoride, 3, 292 Bismuth tribromide, 3, 291 Bismuth trichloride, 3, 290 Bismuth trifiuoride, 3, 290 Bismuth triiodide, 3,292 Bismuth trioxide, 3,284 2,2 -Bisphenol metal complexes color photography, 6,109 Bis(trimethylene)triamine metal complexes, 2, 49 4,4 -Bi-l, 2,4-triazolyl metal complexes, 2, 89 polymers... 

Bismuthonium ylides, 4 34 Bismuth(III) oxide, 4 23-24 Bismuth oxide(l l), 4 23 Bismuth oxide(l 2), 4 23 Bismuth oxide(2 4), 4 23 Bismuth oxide(3 5), 4 23 Bismuth oxide(4 9), 4 23 Bismuth oxide halides, 4 23 Bismuth oxides, 4 23-24 Bismuth oxybromide, 4 23 Bismuth oxychloride, 4 23 physical properties of, 4 20t pigment used in makeups, 7 836t Bismuth oxyfluoride, 4 23 Bismuth oxyiodide, 4 23 Bismuth pentafluoride, 4 22 physical properties of, 4 20t Bismuth phosphate, 4 25... 

Direct halogenation of metallic bismuth yields bismuth pentafluoride in the case of fluorine, the corresponding bismuth trihalides for the other halogens. Reaction of bismuth trioxide with aqueous HF, HC1, or HBr yields the corresponding bismuth trihalide. Physical and thermochemical properties of the more important bismuth halides appear in Table 2. 

Bismuth oxide hydroxide, see Bismuthic acid, 0228 Bismuth pentafluoride, 0227 Bismuth trioxide, 0233 Bismuth trisulfide, 0234... 

Beryllium chloride, 0221 Beryllium fluoride, 0223 Bis(l-chloroethylthallium chloride) oxide, 1586 Bismuth pentafluoride, 0227... 

All halides of the type AX6 are very hygroscopic and are hydrolyzed by water. Bismuth pentafluoride, a white solid, becomes yellow with the least trace of water and readily fluorinates other substances, with reversion to BiF3. 

Bismuth pentafluoride under normal conditions is a white solid, which is probably polymerized by fluorine bridges. X-ray powder photography shows it to have the same structure as the body-centered tetragonal a-UF6 (49). Other halides of bismuth (V) are unknown. 

White to gray dimorphic crystals, d 8.3. mp 725-730. Volatilizes at higher temps slowly and without decompn. Practically insol in water. Sol in coned HF with the forma -tion of complexes. See also Bismuth Pentafhioride. use In the prepn of bismuth pentafluoride. 

Bismuth pentafluoride, made by direct fluorination of liquid bismuth at 600° with fluorine at low pressure, is a white crystalline solid and an extremely powerful fluorinating agent. 

Bismuth pentafluoride 8185 7787-62-4 303.972 wh tetr needles 161.4 230 6.66 reac EIjO... 

Bismuth line, 294 Bismuthotungstates, 1042 Bismuth pentafluoride, 292 Bismuth tribromide, 291 Bismuth trichloride, 290 Bismuth trifluoride, 290 Bismuth triiodide, 292 Bismuth trioxide, 284 Bond dissociation Si=Cr, 184 Bond energies Group IVB elements, 185 Bonds... 

Uses In prep, of bismuth pentafluoride Manuf/Distnb. Advance Research Chems. Alfa Aesar http //www.alfa.com-, Atofina http //www.atofinachemicals.com-, Noah http //www.noahtech.com... 

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