Identifiers | |
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3D model (JSmol)
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ChEMBL | |
ChemSpider | |
ECHA InfoCard | 100.010.294 |
EC Number |
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PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
C3H3N3S3 | |
Molar mass | 177.26 g·mol−1 |
Appearance | yellow solid |
Density | 135 g/cm3 |
Melting point | 290 °C (554 °F; 563 K) |
Hazards | |
GHS labelling:[1] | |
Warning | |
H302 | |
P261, P264, P264+P265, P270, P271, P280, P301+P317, P302+P352, P304+P340, P305+P351+P338, P319, P321, P330, P332+P317, P337+P317, P362+P364, P403+P233, P405, P501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Thiocyanuric acid is the organosulfur compound with the formula (HNC=S)3. It is analogous to cyanuric acid ((HNC=O)3). Cyanuric acid is white whereas thiocyanuric acid is yellow. It can also be viewed as a trimeric thioamide.
It is a planar molecular as determined by X-ray crystallography. Like cyanuric acid, thiocyanuric acid forms extended hydrogen-bonded network resulting in a sheet-like structure. This arrangement is relevant to the high melting point of the compound.[2]
A modern synthesis begins with cyanuric chloride and a source of hydrosulfide.[3]
The compound is mildly acidic, with pKa's of 5.7, 8.4, and 11.4.[3] Various salts of (HNC=S)−3 have been characterized.[4]
The compound has an affinity for heavy metals. This attribute has been exploited by applying thiocyanuric acid and derivatives to treatment of waste waters.[5]