Note 20 bis — Chapter VI · TTHE COMPOUNDS OF NITROGEN WITH HYDROGEN AND OXYGEN

Imide, NH, has not been obtained in a free state, but its hydrochloric acid salt, NHHCl, has apparently been obtained (1890) by Maumené by igniting the double bichloride of platinum and ammonium chloride, PtCl2NH4Cl = Pt + 2HCl + NHHCl. It is soluble in water, and crystallises from its solution in hexagonal rhombic prisms. It gives a double salt with FeCl3 of the composition FeCl33NHHCl. The salt NHHCl is similar (isomeric) with the first possible product of the metalepsis of ammonia, NH2Cl, although it does not resemble it in any of its properties.