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The kinetics of hydrolysis of sulphamic acid have been studied in perchloric acid solutions (0.2-10.2 mol dm-3) at 48.5-80 "C. The measured first-order rate constant increases up to [H+] = ca. 2.0 rnol dm4 and then gradually decreases with increasing acidity. The rate law for the acid-catalysed hydrolysis of sulphamic acid (as distinct from that of the sulphamate ion) is Rate = k2[H+J [NH,SO,-]a, (where a, is the activity ofwater) and an A-2 mechanism is suggested.

Nitroamine and nitrous acid react in aqueous perchloric acid to give nitrate ion and nitrogen. The rate equation is Rate = (k4[NH2N02] f k5[NHN0,-]) [H+] [HN02] where k4 = 2.8 x and k5 = 1.6 x lo3 dms mol-, s-l at 0 "C. corresponding to attack of the nitrosating agent on the neutral and deprotonated nitroamine molecules. Mechanisms for these reactions are discussed, and the lack of reactivity of the neutral nitroamine molecule is considered.NITROAMINE, NH,NO,, is usually prepared by the action of its acid-and base-catalysed decomposition are of sulphuric acid on potassium nitrocarbamatel or of well known, little information is available on other nitric acid on sulphamic acid.2 While kinetic studies aspects of its chemistry. The structure of NH,NO,

Pyridine Pt(II) Compounds, Complexes of Pt(II) and Pd(II) X-ray crystal structures and properties of the two Pd(II) and Pt(II) complexes [bpeH2][PdCl4] and [Pt(bpe)Cl2], [bpe = l,2-bis(pyridin-2-yl)ethane] are described and corre lated with the IR and 'H N M R /13C NM R spectroscopic data. In the case of the Pt(II) com plex, the l,2-bis(pyridin-2-yl)ethane is bound to the metal by the heterocycle nitrogen atoms but no direct bond is found in the case of the Pd(II) complex. The ligand exhibits low energy geom etries in both compounds: the c/s-conformation in the Pt(II) complex, and the transconformation in the Pd(II) complex.