Structural Formula Vector Image
Title: Tribromosilane
CAS Registry Number: 7789-57-3
Additional Names: Tribromomonosilane; silicobromoform
Molecular Formula: Br3HSi
Molecular Weight: 268.81
Percent Composition: Br 89.18%, H 0.37%, Si 10.45%
Line Formula: SiHBr3
Literature References: Prepd by passing hydrogen bromide over heated silicon or a silicide such as copper silicide: Schumb, Young, Inorg. Synth. 1, 38 (1939); Schenk in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) pp 692-694.
Properties: Mobile liquid. Spontaneously flammable when the contact surface with air is large. d417 2.7. mp -73.5°. bp760 111.8°. The vapor pressure at 0° is given as 8.8 mm Hg. Dipole moment 0.79. Hydrolyzed by water with the formation of silicoformic anhydride, H2Si2O3 and HBr. Sol in chlorinated hydrocarbons.
Melting point: mp -73.5°
Boiling point: bp760 111.8°
Density: d417 2.7

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