The reactions of ground-state and first-excited-state oxygen atoms with cyanogen have been investigated using the technique of flash photolysis and kinetic spectroscopy. In experiments using ozone+cyanogen mixtures under conditions where only the ozone is decomposed by the photolytic flash to give O1D, it was possible to detect absorption due to CN and NCO together with other transient spectra in the regions 2807, 3290, 3920 and 4265 Å. From the kinetic evidence described in this work together with spectroscopic data obtained elsewhere these latter spectra would appear to be due to the free NCN radical. No transient species were observed during the photolysis of nitrogen dioxide+cyanogen mixtures where the reaction involved is that between ground-state (3P) oxygen atoms and cyanogen. Investigations were also carried out on cyanogen+oxygen mixtures using an annular spectrosil flash tube-reaction vessel assembly; the cyanogen was dissociated to a considerable extent and reactions between free CN radicals and molecular oxygen were studied.
From the results obtained it is concluded that ground-state oxygen atoms do not react with cyanogen to any appreciable extent at room temperature, whereas O1D atoms react rapidly, O1D+C2N2→NCO + CN. The reaction between free CN radicals and molecular oxygen is also fast, again leading to the formation of NCO according to CN+O2→NCO+O(3P). Subsequent reactions leading to the production of NCN radicals are discussed.
利用闪光光解和动力光谱技术,研究了基态和第一激发态
氧原子与
氰化物的反应。在只通过光解闪光分解
臭氧以生成 O1D 的实验中,使用
臭氧和
氰化物的混合物,可以检测到 CN 和 NCO 的吸收,以及在 2807、3290、3920 和 4265 Å 波段的其他瞬态光谱。从本研究中描述的动力学证据以及在其他地方获得的光谱数据来看,这些光谱似乎是自由 NCN 自由基导致的。在
氮二
氧化物和
氰化物混合物的光解过程中,没有观察到瞬态物种,而反应涉及基态 (3P)
氧原子与
氰化物之间的反应。还对
氰化物和
氧的混合物进行了研究,使用环形光谱
硅闪光管-反应器组合;
氰化物在相当程度上被解离,并研究了自由 CN 自由基与分子
氧之间的反应。
根据获得的结果,可以得出结论:基态
氧原子在室温下与
氰化物之间没有显著反应,而 O1D 原子反应迅速,反应为 O1D+
C2N2→NCO + CN。自由 CN 自由基与分子
氧之间的反应也很快,根据反应 CN+O2→NCO+O(3P) 形成 NCO。随后导致 NCN 自由基生成的反应进行了讨论。