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Pentaborane(9)
Pentaborane(9) is an inorganic compound with the formula B5H9. It is one of the most common boron hydride clusters, although it is a highly reactive compound.
Properties B 5 H 9 Molar mass 63.12 g/mol Appearance Colorless liquid Odor pungent, like sour milk[1] Density 0.618 g/mL Melting point −46.8 °C (−52.2 °F; 226.3 K) Boiling point 60.1 °C (140.2 °F; 333.2 K) Reacts SolubilityBenzene, Cyclohexane, and in other hydrocarbonsVapor pressure 171 mmHg (20°C)[1] Hazards Occupational safety and health(OHS/OSH): Extremely toxic, extremely flammable, can ignite spontaneously, corrosive NFPA 704(fire diamond) Pentaborane is a highly polar compound, with a dipole moment of 2.13 D.[7] It is soluble in hydrocarbons like benzene, and cyclohexane, and in greases including those used in lab equipment. The propellant mix that would produce the greatest specific impulse for a rocket motor is sometimes given as oxygen difluoride and pentaborane[ citation needed].
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