Selenium compounds fluorides

Toxic inorganic substances e.g. Lead, manganese, cadmium, antimony, beryllium, mercury arsenic phosphorus selenium and sulphur compounds, fluorides. 

Sodium selenate (see Selenium and selenium compounds) Sodium selenite (see Selenium and selenium compounds) Sodium silicofluoride (see Fluorides)... 

A number of hexahalogenotellurates(IV) have been investigated. A few rather unstable hexafluoro complexes are known, for example the nitrosonium compounds of composition (NO)2XF6 have been obtained40 from the reaction of nitrosulfuryl fluoride, NOS02F, with selenium or tellurium tetrachloride. The selenium compound loses nitrosyl fluoride at room temperature to leave the pentafluoroselenate(lV), whereas the tellurium analogue remains... 

SAFETY PROFILE Poison by inhalation. When heated to decomposition it emits very toxic fumes of F and Se. See also SELENIUM COMPOUNDS and FLUORIDES. 

The volatile components include alkali oxides, PbO, B2O3, ZnO, PiOg and fluorides, and the minority components AS2O3, Sb203 and selenium compounds. All... 

Selenium compounds Sodium azide Sodium carbonate Sodium fluoride Sodium hydroxide Sodium hypochlorite Sodium metabisulfite Stoddard solvent... 

Arsenic (III) fluoride solvates anions, such as fluoride ions to give [AsF4] as well as some covalent compoundsi " with the exception of alkali metal fluorides. The AsF4 -ion is isoelectronic with selenium(IV) fluoride, which has a distorted trigonal bipyramidal structure. Ionic compounds are usually insoluble. Various other halides are fluorinated such as phosphorus(III) chloride, phosphorus(V) chloridp, silicon(IV) chloride, thionyl chloride or tungsten hexachloride. Neutralization type reactions, such as... 

The magnetic criterion is particularly valuable because it provides a basis for differentiating sharply between essentially ionic and essentially electron-pair bonds Experimental data have as yet been obtained for only a few of the interesting compounds, but these indicate that oxides and fluorides of most metals are ionic. Electron-pair bonds are formed by most of the transition elements with sulfur, selenium, tellurium, phosphorus, arsenic and antimony, as in the sulfide minerals (pyrite, molybdenite, skutterudite, etc.). The halogens other than fluorine form electron-pair bonds with metals of the palladium and platinum groups and sometimes, but not always, with iron-group metals. 

Fluorine also reacts with other halogens, forming interhalogen compounds. While with bromine and iodine it reacts vigorously at ordinary temperatures, with chlorine the reaction occurs at 200°C. Such interhalogen products with these halogens include iodine heptafluoride, bromine trifluoride, bromine pentafluoride, and chlorine trifluoride. Metalloid elements, such as arsenic, silicon, selenium, and boron also inflame in a stream of fluorine, forming fluorides. 

Gas chromatography and mass spectroscopy (GC/MS) of inorganic and organometallic compounds, 18 273-276 Gaseous hydroxides, 5 215-258 dimerization of, 5 224 mass spectrometric study of, 5 220-225 metalic, 5 220 nonmetallic, 5 217-220 study of in oxyhydrogen flame, 5 225-226 types of, 5 215-217 Gases, see also specific substances high ternperamre species from, 14 137-139 thermal decomposition of, 17 90-93 Gas phase electron resonance spectra, of sulfur and selenium fluorides, 24 190... 

Selenium tetrafluoride is a liquid (bp 106 C) which is soluble in halogenated solvents enabling reactions to be carried out at atmospheric pressure. It is has been reported to fluorinate alcohols to their corresponding fluorides, carbonyl compounds to gem-difluorides, e.g. 1—2, and carboxylic acids to acid fluorides. 

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