Is hydrazoic acid (HN3) an intermediate in the destruction of hydrazine by excess nitrous acid?
作者:Anne M. M. Doherty、Kevin R. Howes、Geoffrey Stedman、Memdoh Q. Naji
DOI:10.1039/dt9950003103
日期:——
acidities, and the pKa of NH3+NNOH is 0.57. In excess hydrazine decomposition occurs to form hydrazoic acid (HN3), but in excess nitrous acid a rapid second nitrosation occurs by a diffusion-controlled reaction between NO+ and NH2NNOH which can bypass this pathway, though the possibility of some hydrazoic acid formation cannot be ruled out. Spectrophotometric evidence has been obtained for the formation
NH 2 N NOH的分解动力学,即亚硝酸-肼反应中形成的在225 nm处吸收的中间体,已通过停止流式分光光度法在高达1 mol dm –3 H +的酸度下进行了研究。在高酸度下会发生大量的质子化,并且NH 3 + N NOH的p K a为0.57。过量的肼分解会生成肼酸(HN 3),但是在过量的亚硝酸中,NO +和NH 2 N之间的扩散控制反应会导致快速的第二次亚硝化尽管不能排除某些形成肼基酸的可能性,但NOH可以绕过该途径。已获得分光光度法证据,表明形成了相对稳定的物种,可能是很小的成分,即双亚硝化反应的产物。