Abstract
In 1881 Jones and Taylor demonstrated the existence of a compound of boron and hydrogen, and 20 years later Ramsay and Hatfield published a preliminary account of a research on the hydrides of boron, describing experiments which, even if they cannot be regarded as conclusive, opened up a field of investigation well worthy of attention. They found that on passing the gas evolved by the action of dilute acids on magnesium boride through a bulb cooled in liquid air, a solid substance was deposited which, on warming the bulb, volatilised and could be collected as a gas. From the results of the analysis of the gas, and its density, its formula appeared to be B
3
H
3
; but it appeared to consist of two isomeric substances, one stable, and the other unstable and readily decomposed by reagents. The gas which was not condensed by liquid air appeared to consist mainly of hydrogen, but to contain a hydride or hydrides of boron. Assuming the trivalency of boron, it is possible, as Ramsay and Hatfield point out, that a very large number of “hydroborons” may exist. The simpler of these may be represented by the formulæ:— (
a
) BH
3
, (
b
) BH
2
-BH
2
(
c
) BH=BH, (
d
) BH
2
-BH-BH
2
(
e
) BH
2
-B=BH, (
f
) BH / BH-BH.
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