Diborane gas

Chemical Reactivity - Reactivity with Water Reacts to form flammable hydrogen gas Reactivity with Common Materials Reacts with acids to form toxic, flammable diborane gas. Slowly attacks and destroys glass Stability During Transport Stable unless contaminated with acids or is overheated, thereby forming flammable hydrogen gas Neutralizing Agents for Acids and Caustics Caustic formed by the reaction with water can be diluted with water and then neutralized with acetic acid Polymerization Not pertinent Inhibitor of Polymerization Not pertinent. 

H.12 The reaction of boron trifluoride, BF,(g), with sodium borohydride, NaBH4(s), leads to the formation of sodium tetrafluoroborate, NaBF4(s), and diborane gas, B2Hfc(g). The diborane reacts with the oxygen in air, forming boron oxide, B20 j(s), and water. Write the two balanced equations leading to the formation of boron oxide. 

Fig. 19. Hydrogen diffusion coefficient, measured at 240°C, as a function of phosphine and diborane gas phase doping level, deduced from the data in Fig. 17. The dependence on dangling bond density is indicated on the top horizontal scale (Street el al., 1987b).

Fig. 23. Hydrogen evolution rate against temperature for p-type doped a-Si H films for increasing diborane gas phase doping level, as indicated (Beyer and Wagner, 1981). 

The silanol group would be protected from the diborane gas. Mathieu and Imelik (203) supported this theory by infrared spectroscopy of the reaction products. There are no other examples known of analogous reactions of diborane. No compounds of the type —OR were ever... 

Common, Indicator (April 1964), p 15 (An expln results when furfuryl ale is reacted with cyanoacetic acid) 26) R. Scott Jr, C EN 45, No 21(15 May 1967), p 5 (Rept of an expln of a mixt of boron trifluoride-ethyletherate lithium aluminum-hydride in a lab attempt to prep Diborane gas)... 

Borane complexes, borane-THF and borane dimethylsulfide, are generally the appropriate reducing agents in this reaction. Borane thioxane has been used, but it suffers from the inconvenience that thioxane is quite expensive. Diborane gas has been tried by Callery and has proved to be very efficient. The use of this reagent could open new industrial developments for this technology. Catecholborane has shown some advantages at low temperature when selectivity is needed.40... 

The diborane gas is easily separated from the liquid BCI3 and the latter is fed back to the primary process (8.2). The temperature of750 °C is an approximate upper bound for reaction (8.2) because at higher temperatures the decomposition to elemental boron sets in. The process is, nevertheless, carried out at these high temperatures because of the thermodynamic limitations (see Table 8.7). 

A sample of diborane gas (B2H6), a substance that bursts into flames when exposed to air, has a pressure of 345 torr at a temperature of — 15°C and a volume of 3.48 L. If conditions are changed so that the temperature is 36°C and the pressure is 468 torr, what will be the volume of the sample ... 

BOROHIDRURO SODICO (Spanish) (16940-66-2) Combustible solid. Dust or powder forms explosive mixture with air autoignition above 550°F/288°C. Reacts with water, steam, moist air, alcohols, glycols, phenols, cresols, palladium dust, producing flammable hydrogen gas. Violent reaction with acids, forming diborane gas, with the possibility of explosion. Violent reaction with oxidizers, dimethyl formamide, aldehydes, ketones, metal powders, metal salts, sodium hydroxide. Polymerization may be caused by contact with bases, acrylonitrile, sodium borohydride. Forms explosive material that is ultra-sensitive to friction or shock, and moisture-sensitive with salts of ruthenium. Attacks metals. Corrodes glass slowly. 

We want to use the ideal gas law equation to determine the volume of diborane gas. 

We know the initial pressure, volume, and temperature of the diborane gas. 

Note that the value of n is not given. However, we know that n is constant (that is, Hi = n- because no diborane gas is added or taken away. Thus, in this experiment, n is constant and P, V, and T change. Therefore, we rearrange the ideal gas equation PV = nRT) by dividing both sides by T,... 

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