Thorin (chemistry)

{{Chembox

| Verifiedfields = changed

| Watchedfields = changed

| verifiedrevid = 470609258

| ImageFile = Thorin.svg

| ImageSize = 244

| ImageName = Structural formula of ((4E)-4-hydrazin-1-ylidene)-thorin

| Name = Thorin

| PIN = Disodium 3-hydroxy-4-[(2-arsonophenyl)diazenyl]naphthalene-2,7-disulfonate

| SystematicName = Disodium 4-[2-(2-arsonophenyl)hydrazin-1-ylidene]-3-oxo-3,4-dihydronaphthalene-2,7-disulfonate

| OtherNames = 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

|Section1={{Chembox Identifiers

| CASNo = 3688-92-4

| CASNo_Comment = (4E)-4-hydrazin-1-ylidene

| CASNo_Ref = {{cascite|changed|??}}

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = LFP7CNK4M5

| PubChem = 77269

| PubChem1 = 6537679

| PubChem1_Comment = (4E)-4-hydrazin-1-ylidene

| ChemSpiderID2_Ref = {{chemspidercite|changed|chemspider}}

| ChemSpiderID2 = 4895471

| ChemSpiderID_Ref = {{chemspidercite|changed|chemspider}}

| ChemSpiderID = 5020708

| ChemSpiderID_Comment = (4E)-4-hydrazin-1-ylidene

| EINECS = 222-993-1

| UNNumber = 1557

| Beilstein = 2957648

| SMILES = [Na+].[Na+].O[As](O)(=O)c3ccccc3/N=N/c1c2ccc(cc2cc(c1O)S([O-])(=O)=O)S([O-])(=O)=O

| SMILES1 = [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

| StdInChI = 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

| StdInChI_Ref = {{stdinchicite|changed|chemspider}}

| InChI1 = 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+;;

| StdInChIKey = ZQMPNLOZJUWHSA-UHFFFAOYSA-L

| StdInChIKey_Ref = {{stdinchicite|changed|chemspider}}

| InChIKey = DCSRPHQBFSYJNN-GJLVVKPQBS}}

|Section2={{Chembox Properties

| C=16 | H=11 | As=1 | N=2 | O=10 | S=2

| Appearance = Orange-yellow crystals

| MeltingPtC = 300}}

|Section3={{Chembox Hazards

| GHSPictograms = {{GHS06}}{{GHS09}}

| GHSSignalWord = Danger

| HPhrases = {{H-phrases|301|331|410}}

| PPhrases = {{P-phrases|261|264|270|271|273|301+310|304+340|311|321|330|391|403+233|405|501}}

| NFPA-H = 3

| NFPA-F = 0

| NFPA-R = 0}}

}}

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.{{cite journal |last1=Haartz |first1=J. C. |last2=Eller |first2=Peter M. |last3=Hornung |first3=Richard W. |title=Critical parameters in the barium perchlorate/Thorin titration of sulfate |journal=Analytical Chemistry |date=1 November 1979 |volume=51 |issue=13 |pages=2293–2295 |doi=10.1021/ac50049a056}}