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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]
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较如下（越在左侧越容易被氧化）：[1]
SeCN− > I− > SCN− > CN− > Br− > N3- > Cl− > OCN− > CNO− > F−
- ^ 1.0 1.1 Golub, A M; Skopenko, Viktor V. METAL SELENOCYANATES AND THEIR PROPERTIES. Russian Chemical Reviews (IOP Publishing). 1965-12-31, 34 (12): 901–908. ISSN 0036-021X. doi:10.1070/rc1965v034n12abeh001573.
- ^ Crookes, William Von. Ueber die Selencyanide. 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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|---|
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| HSeCN
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|
|
|
He
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| Li
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Be
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B
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C
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N
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O
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F
|
Ne
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| NaSeCN
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Mg
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Al
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Si
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P
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S
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Cl
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Ar
|
| KSeCN
|
Ca
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Sc
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Ti
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V
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Cr
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Mn
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Fe
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HgCo(NCSe)4
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Ni
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CuSeCN
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Zn(SeCN)2
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Ga
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Ge
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As
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Se
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Br
|
Kr
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| Rb
|
Sr
|
Y
|
Zr
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Nb
|
Mo
|
Tc
|
Ru
|
Rh
|
Pd
|
AgSeCN
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Cd
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In
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Sn
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Sb
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Te
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I
|
Xe
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| Cs
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Ba
|
镧系
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Hf
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Ta
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W
|
Re
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Os
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Ir
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Pt
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Au
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Hg(SeCN)2
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Tl
|
Pb(SeCN)2
|
Bi
|
Po
|
At
|
Rn
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| Fr
|
Ra
|
锕系
|
Rf
|
Db
|
Sg
|
Bh
|
Hs
|
Mt
|
Ds
|
Rg
|
Cn
|
Nh
|
Fl
|
Mc
|
Lv
|
Ts
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Og
|
|
|
|
↓
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|
|
| 镧系
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La
|
Ce
|
Pr
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Nd
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Pm
|
Sm
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Eu
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Gd
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Tb
|
Dy
|
Ho
|
Er
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Tm
|
Yb
|
Lu
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| 锕系
|
Ac
|
Th
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Pa
|
U
|
Np
|
Pu
|
Am
|
Cm
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Bk
|
Cf
|
Es
|
Fm
|
Md
|
No
|
Lr
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| | |
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