Thorin (chemistry)

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
CAS Number	3688-92-4 (4E)-4-hydrazin-1-ylidene ;
3D model (JSmol)	Interactive image; Interactive image;
Beilstein Reference	2957648
ChemSpider	5020708 (4E)-4-hydrazin-1-ylidene ; 4895471 ;
ECHA InfoCard	100.020.903
EC Number	222-993-1;
PubChem CID	77269; 6537679 (4E)-4-hydrazin-1-ylidene;
UNII	LFP7CNK4M5 ;
UN number	1557
CompTox Dashboard (EPA)	DTXSID20893911 ;
	InChI InChI=1S/C16H13AsN2O10S2.2Na/c20-16-14(31(27,28)29)8-9-7-10(30(24,25)26)5-6-11(9)15(16)19-18-13-4-2-1-3-12(13)17(21,22)23;;/h1-8,18H,(H2,21,22,23)(H,24,25,26)(H,27,28,29);;/q;2+1/p-2 Key: ZQMPNLOZJUWHSA-UHFFFAOYSA-L ; Key: DCSRPHQBFSYJNN-GJLVVKPQBS; InChI=1/C16H13AsN2O10S2.2Na/c20-16-14(31(27,28)29)8-9-7-10(30(24,25)26)5-6-11(9)15(16)19-18-13-4-2-1-3-12(13)17(21,22)23;;/h1-8,20H,(H2,21,22,23)(H,24,25,26)(H,27,28,29);;/q;2+1/p-2/b19-18+;;;
	SMILES [Na+].[Na+].O[As](O)(=O)c3ccccc3/N=N/c1c2ccc(cc2cc(c1O)S([O-])(=O)=O)S([O-])(=O)=O; [Na+].[Na+].O[As](O)(=O)C1=CC=CC=C1NN=C1C(=O)C(=CC2=C1C=CC(=C2)S([O-])(=O)=O)S([O-])(=O)=O;
Properties
Chemical formula	C16H11AsN2O10S2
Molar mass	530.31 g·mol−1
Appearance	Orange-yellow crystals
Melting point	300 °C (572 °F; 573 K)
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H331, H410
Precautionary statements	P261, P264, P270, P271, P273, P301+P310, P304+P340, P311, P321, P330, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)	3 0 0
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) 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.^[1]

References

^ Haartz, J. C.; Eller, Peter M.; Hornung, Richard W. (1 November 1979). "Critical parameters in the barium perchlorate/Thorin titration of sulfate". Analytical Chemistry. 51 (13): 2293–2295. doi:10.1021/ac50049a056.

External links

MSDS at Oxford University

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[1] Haartz, J. C.; Eller, Peter M.; Hornung, Richard W. (1 November 1979). "Critical parameters in the barium perchlorate/Thorin titration of sulfate". Analytical Chemistry. 51 (13): 2293–2295. doi:10.1021/ac50049a056.

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