硫氰酸

Description

thiocyanic acid · CAS 463-56-9 · HSCN. UNII A5KWW7N91V. Melting Point: 5 °C; Vapor Pressure: 4.73 [mmHg].

Identification

CAS Registry Number	463-56-9
PubChem CID	781
Molecular formula	HSCN
IUPAC name	thiocyanic acid
UNII (FDA)	A5KWW7N91V

Computed Descriptors

Molecular Weight	59.09
XLogP3	0.6
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	2
Rotatable Bond Count	0
Exact Mass	58.98297021
Monoisotopic Mass	58.98297021
Topological Polar Surface Area	24.8
Heavy Atom Count	3
Formal Charge	0

Physical & Chemical Properties

Melting Point	5 °C
Vapor Pressure	4.73 [mmHg]

Physical description & handling notes

• Colorless gas or white solid (depends on degree of polymerization); [Merck Index] Colorless liquid; mp = 5 deg C; [ICSC]
• COLOURLESS LIQUID.
• Solubility in water: good
• Relative vapor density (air = 1): 2.0
• 0.58 (estimated)
• 99.8 Ų [M-H]- [CCS Type: DT; Buffer gas: N2; Ionization: ESI-; Dataset: TOXCAST; Source Identifier: DTXSID4021343]

GHS Hazard Classification

Reported hazard statements	H302, H312, H332, H412

Documented Uses

• Exposure occurs from breathing air and drinking water, touching soil or water containing thiocyanate, or eating foods that contain thiocyanate. Thiocyanates are present in water primarily because of discharges from coal processing, extraction of gold and silver, and mining industries. Thiocyanate is the major product formed from cyanide that passes into the body as the body attempts to rid itself of cyanide, thus exposure to cyanide also results in exposure to thiocyanate. (L191)
• 200 to 300 milligrams for an adult human (cyanide salts). (T86)
• Organic nitriles are converted into cyanide ions through the action of cytochrome P450 enzymes in the liver. Cyanide is rapidly absorbed and distributed throughout the body. Cyanide is mainly metabolized into thiocyanate by either rhodanese or 3-mercaptopyruvate sulfur transferase. Cyanide metabolites are excreted in the urine. (L96)

Synonyms

thiocyanic acid; 463-56-9; Sulfocyanic acid; hydrogen thiocyanate; nitridosulfanidocarbon; A5KWW7N91V; CHEBI:29200; DTXSID7047221; hydrogen rhodanide; RefChem:189475; DTXCID5027221; nitridosulfanidocarbon;thiocyanic acid; 207-337-4; HSCN; HS-C#N; N#C-SH

Frequently Asked Questions

What are the CAS number and molecular formula of thiocyanic acid?

CAS 463-56-9; molecular formula HSCN; molecular weight — g/mol.

What other names is thiocyanic acid known by?

thiocyanic acid, 463-56-9, Sulfocyanic acid, hydrogen thiocyanate, nitridosulfanidocarbon, A5KWW7N91V.

Is thiocyanic acid classified as hazardous?

Hazard statements reported: H302, H312, H332, H412.

What are the key physical properties of thiocyanic acid?

Melting Point: 5 °C; Vapor Pressure: 4.73 [mmHg].

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.