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. 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−.
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−, Re
2(NCSe)
82−, Pa(NCSe)
84− and U(NCSe)
84−.
Production
Selenocyanate can be produced in the reaction of selenium, selenide, selenite or selenate with cyanide ions.
:Se
2− + CN
− + 0.5 O
2 → SeCN
− + 2OH
−
:SeO
32− + 3CN
− → 2OCN
− + SeCN
− + 2OH
−
:SeO
42− + 4CN
− → 3OCN
− + SeCN
− + 2OH
−
Reactions
Selenocyanate is oxidised to selenium and cyanate by ''bis'' (trifluoroacetoxy) iodobenzene.
Application
Selenocyanate is component of pollution from oil refineries and
mine drainage water. Remediation methods have been investigated to extract selenocyanate from water. Methods considered include precipitation by metal salts, or extraction by plants.
Indian mustard
''Brassica juncea'', commonly brown mustard, Chinese mustard, Indian mustard, leaf mustard, Oriental mustard and vegetable mustard, is a species of mustard plant.
Cultivar
''Brassica juncea'' cultivars can be divided into four major subgroups ...
converts some selenocyanate to
selenocystine and
selenomethionine
Selenomethionine (SeMet) is a naturally occurring amino acid. The L-selenomethionine enantiomer is the main form of selenium found in Brazil nuts, cereal grains, soybeans, and grassland legumes, while ''Se''-methylselenocysteine, or its γ-glut ...
, and volatiles
dimethylselenide
Dimethyl selenide is the organoselenium compound with the formula (CH3)2Se. This colorless, malodorous, liquid is the simplest selenoether. It occurs in trace amounts in anaerobic environments.
Dimethyl selenide is prepared by treating Se2- sour ...
and
methylselenocyanate.
List
References
{{Cyanides
*