Thorin (chemistry)

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Thorin (chemistry)
Structural formula of ((4E)-4-hydrazin-1-ylidene)-thorin
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

3688-92-4 (4E)-4-hydrazin-1-ylidene N
3D model (Jmol) Interactive image
Interactive image
ChemSpider 5020708 (4E)-4-hydrazin-1-ylidene N
4895471 N
ECHA InfoCard 100.020.903
EC Number 222-993-1
PubChem 6364518
6537679 (4E)-4-hydrazin-1-ylidene
UN number 1557
Molar mass 530.31 g·mol−1
Appearance Orange-yellow crystals
Melting point 300 °C (572 °F; 573 K)
Main hazards Toxic (T), Dangerous for the environment (N)
R-phrases R23/25, R50/53
S-phrases S20/21, S28, S45, S60, S61
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

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.


Analytical Chemistry, 51, 2293 (1979).

External links[edit]