Thorin (chemistry)

Thorin (also called Thoron or Thoronol) is an indicator used in the determination of barium, beryllium, lithium, uranium and thorium compounds. Being a compound of arsenic, it is highly toxic.

Thorin
Names
Preferred IUPAC name
Disodium 3-hydroxy-4-[(2-arsonophenyl)diazenyl]naphthalene-2,7-disulfonate
Systematic IUPAC name
Disodium 4-[2-(2-arsonophenyl)hydrazin-1-ylidene]-3-oxo-3,4-dihydronaphthalene-2,7-disulfonate
Other names
Disodium 4-[2-(2-arsonophenyl)hydrazin-1-ylidene]-3-oxonaphthalene-2,7-disulfonate

2-(3,6-Disulfo-2-hydroxy-1-naphthylazo)benzenearsonic acid disodium salt
Thoron

Thoronol
Identifiers
3D model (JSmol)
2957648
ChemSpider
ECHA InfoCard 100.020.903
EC Number
  • 222-993-1
UN number 1557
Properties
C16H11AsN2O10S2
Molar mass 530.31 g·mol−1
Appearance Orange-yellow crystals
Melting point 300 °C (572 °F; 573 K)
Hazards
Main hazards Toxic (T), Dangerous for the environment (N)
R-phrases (outdated) R23/25, R50/53
S-phrases (outdated) S20/21, S28, S45, S60, S61
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
0
3
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

References

Analytical Chemistry, 51, 2293 (1979).

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