Formation of trithiocyanate in the oxidation of aqueous thiocyanate.
Formation of trithiocyanate in the oxidation of aqueous thiocyanate.
复制标题
硫氰酸盐水溶液氧化时形成三硫氰酸盐。
DOI：
10.1002/chin.200214020
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发表时间：
2002
影响因子：
4.6
通讯作者：
D. Stanbury
中科院分区：
文献类型：
--
作者：
Jon J Barnett;D. Stanbury
SCN（-）在酸性介质中因缺乏氯水而氧化，在不到3ms的时间内产生短暂的紫外线吸收特征。该中间体具有相同的光谱和动力学特征，在以前的研究中发现的氧化SCN（-）由H(2)O(2)或ClO(2)。紫外吸光度随SCN（-）浓度的增加而增加，但不随[H(+)]浓度的增加而增加。这些观测结果证明（SCN）(2)和（SCN）(3)（-）都对吸光度有贡献，并且彼此处于平衡状态。推导出相应的摩尔吸收率和平衡常数的值。（SCN）(2)水解成HOSCN具有很小的平衡常数。
Oxidation of SCN(-) in acidic media by a deficiency of aqueous chlorine generates a transient UV absorption feature in less than 3 ms. This intermediate has the same spectral and kinetic features as were found in prior studies of the oxidation of SCN(-) by H(2)O(2) or ClO(2). The UV absorbance increases strongly with increasing concentration of SCN(-) but not with increasing [H(+)]. These observations are evidence that (SCN)(2) and (SCN)(3)(-) both contribute to the absorbance and are in equilibrium with each other. Values of the corresponding molar absorptivities and the equilibrium constant are derived. Hydrolysis of (SCN)(2) to HOSCN is shown to have a small equilibrium constant.