硒氰酸盐
性质
硒氰酸盐在盐酸中不稳定,放出氰化氢并析出红硒:
- SeCN− + H+ → HCN + Se
硒氰酸根离子可以多聚,形成含有诸如(SeCN)3-、(NCSe)2I-的化合物。
硒氰酸的Cd2+、Hg2+、Pb2+、Ag+盐都是难溶于水的固体。硒氰酸铵不稳定,肼盐则存在着如下平衡:N2H5NCSe ↔ H2N−CSe−NH−NH2。Fe2+盐的制备,无论是固体还是溶液,都未曾得到过[2],而铁单质亦可使SeCN−分解,产生CN−并析出Se[3],尽管如此,其配合物是已知的。[4]
硒氰酸根和其它卤素或拟卤素的活性比較如下(越在左侧越容易被氧化):[1]
SeCN− > I− > SCN− > CN− > Br− > N3- > Cl− > OCN− > CNO− > F−
参考文献
- A.M.Golub and V.V. Skopenko. METAL SELENOCYANATES AND THEIR PROPERTIES. Russian Chemical Reviews, 1965. Vol.34 No. 12
- Crookes, William Von. . Annalen der Chemie und Pharmacie. 1851, 78 (2): 177–187. ISSN 0075-4617. doi:10.1002/jlac.18510780207.
- Xiaoguang Meng, Sunbaek Bang, George P Korfiatis. Removal of selenocyanate from water using elemental iron. Water Research, 2002. 30(15): 3867–3873
- Christopher J. Adams, et al. Iron(II) thio- and selenocyanate coordination networks containing 3,3'-bipyridine. Cryst Eng Comm, 2011, 13, 4909
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