Potassium selenocyanate

Potassium selenocyanate
Identifiers
CAS Number	3425-46-5;
3D model (JSmol)	Interactive image;
ChemSpider	69409;
ECHA InfoCard	100.020.292
EC Number	222-320-1;
PubChem CID	76960;
CompTox Dashboard (EPA)	DTXSID0063020 ;
	InChI InChI=1S/CHNSe.K/c2-1-3;/h3H;/q;+1/p-1 Key: KYEKHFSRAXRJBR-UHFFFAOYSA-M;
	SMILES C(#N)[Se-].[K+];
Properties
Chemical formula	CNKSe
Molar mass	144.08
Appearance	colorless or white solid
Density	2.35 g/cm3
Solubility in water	high
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Potassium selenocyanate is the inorganic compound with the formula KSeCN. It is a hygroscopic white solid that is soluble in water, decomposing in air to red selenium and potassium cyanide. The compound has been characterized by X-ray crystallography, which confirms that it is a salt. The C-N and C-Se distances are 112 and 183 pm, respectively consistent with triple and single bonds.^[1]

Synthesis and reactions

Potassium selenocyanate is produced by the reaction of molten potassium cyanide with elemental selenium.^[2]

Organic selenocyanates are often prepared by treatment of potassium selenocyanate with alkyl halides or aryl diazonium salts.^[2]

Potassium selenocyanate serves as a source of Se⁰, e.g., in its reaction with triphenylphosphine to give triphenylphosphine selenide.^[3]

References

^ Swank, Duane D.; Willett, Roger D. (1965). "The Crystal Structure of Potassium Selenocyanate". Inorganic Chemistry. 4: 499–501. doi:10.1021/ic50026a013.
^ ^a ^b E. Bulka (1977). "Selenocyanates and Related Compounds". In Saul Patai (ed.). Cyanates and Their Thio Derivatives: Part 2, Volume 2. PATAI'S Chemistry of Functional Groups. p. 619-818. doi:10.1002/9780470771532.ch3.
^ Nicpon, Philip; Meek, Devon W. (1967). "Triphenylphosphine Selenide". Inorganic Syntheses. 10: 157–159. doi:10.1002/9780470132418.ch23.

[1] Swank, Duane D.; Willett, Roger D. (1965). "The Crystal Structure of Potassium Selenocyanate". Inorganic Chemistry. 4: 499–501. doi:10.1021/ic50026a013.

[Patai-2] E. Bulka (1977). "Selenocyanates and Related Compounds". In Saul Patai (ed.). Cyanates and Their Thio Derivatives: Part 2, Volume 2. PATAI'S Chemistry of Functional Groups. p. 619-818. doi:10.1002/9780470771532.ch3.

[3] Nicpon, Philip; Meek, Devon W. (1967). "Triphenylphosphine Selenide". Inorganic Syntheses. 10: 157–159. doi:10.1002/9780470132418.ch23.

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