硒氰酸盐

硒氰酸盐是一类含有硒氰酸根离子(SeCN)的盐类,常见的有硒氰酸钾硒氰酸钠等。其酸HNCSe只存在于溶液中。[1]含有硒氰基团的有机物被称为硒氰酸酯,如C6H5SeCN。

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 ↔ H2NCSeNHNH2。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

  1. A.M.Golub and V.V. Skopenko. METAL SELENOCYANATES AND THEIR PROPERTIES. Russian Chemical Reviews, 1965. Vol.34 No. 12
  2. Crookes, William Von. . Annalen der Chemie und Pharmacie. 1851, 78 (2): 177–187. ISSN 0075-4617. doi:10.1002/jlac.18510780207.
  3. Xiaoguang Meng, Sunbaek Bang, George P Korfiatis. Removal of selenocyanate from water using elemental iron. Water Research, 2002. 30(15): 3867–3873
  4. Christopher J. Adams, et al. Iron(II) thio- and selenocyanate coordination networks containing 3,3'-bipyridine. Cryst Eng Comm, 2011, 13, 4909
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.