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Decaborotetradecahydride, B10H14

When the hydride B4H10 is heated for four or five hours to 100°, or when the hydride B2H6 is heated for forty- eight hours to 115° to 120°, a volatile solid hydride, B10H14, is produced.

This hydride is a colourless solid of peculiar odour resembling that of osmium tetroxide. It sublimes in vacuo at 60° to 80°, producing beautiful long needles of density 0.94. It melts at 99.5° to a colourless liquid that does not decompose below 200°. The molecular weight in benzene solution and the percentage composition are in harmony with the molecular formula B10H14.

The hydride is soluble in alcohol, ether, benzene, and carbon disulphide. It is not decomposed by air or water, is little affected by nitric acid, but is oxidised by potassium permanganate. It dissolves in alkalies, forming a yellow solution.

When prepared from B4H10 or B2H6 by heating, the hydride B10H14 is accompanied by two other non-volatile solid boron hydrides, which are also produced when B10H14 is heated: (i.) a yellow hydride, probably (B5H4)x, insoluble in carbon disulphide and decomposed by water; and (ii.) a colourless hydride, probably B12Hx, soluble in carbon disulphide, not decomposed by water, and converted into (i.) at 150°.

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