Bromine trifluoride, conductivity

When, for example, a weighed amount of metallic gold contained in a fused silica vessel was treated with excess of bromine trifluoiide, it dissolved rapidly. Excess of solvent, together with free bromine, were then evaporated in vacuum and a white solid remained which had the empirical formula AuBrFg. It was freely soluble in bromine trifluoride and enhanced the conductivity of the latter, so that it may reasonably be formulated as an acid (BrFjAuFJ in the bromine trifluoride solvent system. The compound lost bromine trifluoride when heated to 200° and gave auric fluoride AuFg. 

Some BrF is also formed in the reaction, and it can be separated by fractional distillation. Bromine trifluoride is a liquid at room temperature and shows an electrical conductivity high enough to indicate some autoionization, which is usually represented by the reaction... 

The Electrical Conductivity of Solid Chlorine and Bromine Trifluorides... 

T he interest in conductivity measurements on fluorinated inorganic com pounds at cryogenic temperatures lies in the ability of these compounds to form ions for possible synthesis of potential solid oxidizers. In this study we are concerned with the conductivity measurements of solid chlorine and bromine trifluorides to determine their electrical conductivities and its bearing on structural problems. Specific conductivities of <10" at 0° C. (I) and 10 ohm-1cm. 1 (3) have been reported for chlorine trifluoride and 8.0 X l ohm-1cm. 1 at 25° C. (1) for bromine trifluoride. In this work a conductivity cell has been developed for measuring fluorine-containing oxidizers at cryogenic temperatures. The variations of conductivity with temperature of chlorine trifluoride have been measured from +11.3° C. (b.p.) to —130° C. (well below m.p., —83° C.) and of bromine trifluoride from -j-80° C. to —196° C. (m.p., 8.8° C.). Possible mechanisms are discussed. 

The conductivity cell is modified from a conventional type. It is made of borosilicate glass, which resists the attack of anhydrous chlorine and bromine trifluorides, and is equipped with two smooth platinum electrodes to minimize electrode corrosive effects. These electrodes are approximately 12x25 mm. in size, held 1.5 mm. apart with borosilicate glass spacers. The arrangement of electrodes and leads is shown in Figure 1. An internal thermocouple well leads from the top of the cell to a point near the electrodes and contains a copper constantan thermocouple. The cell constant is determined by measuring the cell resistance... 

Figure 5. Conductivity of bromine trifluoride as a function of temperature...

Bromine trifluoride, BrFs, is also commercially available and is used as a nonaqueous ionizing solvent. Its electrical conductivity is derived from a dissociative equilibrium (equation 82). It fluorinates most snbstrates that dissolve in it and typically gives fluorides in their highest valency state. 

ETHYL ACETONE (107-87-9) Forms explosive mixture with air (flash point 45°F/7°C). Reacts violently with strong oxidizers, aldehydes, bromine trifluoride, hydrogen peroxide, nitric acid, perchloric acid. Attacks some plastics, rubber, and coatings. Flow or agitation of substance may generate electrostatic charges due to low conductivity. 

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