Title: Pentaborane(11)
CAS Registry Number: 18433-84-6
Additional Names: Dihydropentaborane(9); pentaboron undecahydride
Molecular Formula: B5H11
Molecular Weight: 65.14
Percent Composition: B 82.98%, H 17.02%
Literature References: Prepd from diborane: Burg, Schlesinger, J. Am. Chem. Soc. 55, 4009 (1933).
Properties: Liquid. mp -123°. bp 63°; bp53 0°. Unstable. When heated or allowed to stand for long periods of time, it produces diborane, tetraborane, hydrogen, pentaborane, decaborane and brown nonvolatile liqs and solids. Ignites spontaneously in air. Hydrolyzes in water to boric acid and hydrogen. Reacts with ammonia to form a tetraammoniate.
Melting point: mp -123°
Boiling point: bp 63°; bp53

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