Selenocyanate

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Selenocyanate
Identifiers
3D model (
JSmol
)
1848016
ChEBI
ChEMBL
ChemSpider
81789
  • InChI=1S/CHNSe/c2-1-3/h3H/p-1
    Key: CRDYSYOERSZTHZ-UHFFFAOYSA-M
  • C(#N)[Se-]
Properties
CNSe−
Molar mass 104.990 g·mol−1
Related compounds
Related compounds
 thiocyanate; cyanate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

A selenocyanate is an ion or chemical compound that contains the -SeCN group, which could be in the form of an anion, SeCN−. Organic selenocyanates also exist.

Some complex ions with transition metals such as silver and mercury (mercuriselenocyanates) are known. Mercuriselenocyanate salts also include K, Fe, Co, Ni, Cu, Zn, and Cd.[1] Complex ions include Fe(NCSe)63−, Fe(NCSe)64−, Fe(NCSe)42−, Co(NCSe)64−, Co(NCSe)42−, Ni(NCSe)64−, Zn(NCSe)64−, Rh(NCSe)64−, Pd(NCSe)42−, Ag(SeCN)2−, Cd(NCSe)42−, Cd(NCSe)64−, Dy(NCSe)63−, Ho(NCSe)63−, Er(NCSe)63−, Pt(NCSe)62−, Au(NCSe)4−, and Hg(NCSe)42−.[2]

For hard metals, the negative charge is on the nitrogen atom which coordinates with the metal atom. Examples include Ti(NCSe)62−, V(NCSe)63−, VO(NCSe)42−, Cr(NCSe)63−, Mn(NCSe)42−, Mn(NCSe)42−, Y(NCSe)63−, Zr(NCSe)62−, Mo(NCSe)63−, Pr(NCSe)63−, Nd(NCSe)63−, Sm(NCSe)63−, Hf(NCSe)62−, Re2(NCSe)82−, Pa(NCSe)84− and U(NCSe)84−.[3]

Production

Selenocyanate can be produced in the reaction of selenium, selenide, selenite or selenate with cyanide ions.[4]

Se2− + CN− + 0.5 O2 → SeCN− + 2OH−
SeO32− + 3CN− → 2OCN− + SeCN− + 2OH−
SeO42− + 4CN− → 3OCN− + SeCN− + 2OH−

Reactions

Selenocyanate is oxidised to selenium and cyanate by bis (trifluoroacetoxy) iodobenzene.[5]

Application

Selenocyanate is component of pollution from oil refineries and

dimethylselenide and methylselenocyanate.[6]

List

formula crystal form space group Å volume density comment reference
[NH4][SeCN] monoclinic P21/c a=4.3443 b=7.3615 c=12.9858 β=99.152° Z=4 416.99 pink due to contamination from red selenium [7]
KSeCN
 monoclinic P21/c a=4.59 b=7.64 c=11.89 β=101.13° [8]
Ag[SeCN] monoclinic C2/c a=8.8300 b=8.2471 c=8.4303 β=93.027° Z=8[9] 613.05 solubility at 18°: 2.0×10−8 Mol/litre [7]
[NH4][Ag(SeCN)2] orthorhombic Pbca a=7.15549 b=20.0671 c=10.4776 Z=8 1504.49 [7]
[NH4]3[Ag(SeCN)4] tetragonal I41/acd a=14.0013 c=31.4678 Z=16 6168.8 [7]
[NH4]0.7K0.3[SeCN] [7]
K2Hg(CNSe)4 [6]
[Cu(IPr)(NCSe)]2 IPr = 1,3- bis(2,6-diisopropylphenyl)imidazol-2-ylidene triclinic P1 a=9.389 b=10.9745 c=14.0542 101.181 90.311 105.620 Z=1 1365.7 @100K [10]
ZnHg(CNSe)4 [6]
CdHg(CNSe)4 [6]

References

  1. ISSN 0369-0261
    .
  2. ISBN 978-0-08-057866-8
    .
  3. ISBN 978-0-08-057866-8
    .
  4. ISBN 978-3-319-57831-6
    .
  5. ISSN 0003-2719
    .
  6. ^
    PMID 11842165
    .
  7. ^
    S2CID 259924312
    .
  8. ISSN 0020-1669
    .
  9. ISBN 978-1-4831-5492-3
    .
  10. S2CID 202034228
    .
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