Sulfarsazene

Sulfarsazene

Names
IUPAC name Sodium 4-({4-[3-(2-arsono-4-nitrophenyl)triaz-2-en-1-yl]phenyl}diazenyl)benzene-1-sulfonate
Other names Plumbone
Identifiers
CAS Number	1772-02-7
3D model (JSmol)	Interactive image
ChemSpider	4953786
ECHA InfoCard	100.015.634
EC Number	217-197-6
PubChem CID	101970427
CompTox Dashboard (EPA)	DTXSID201319389
InChI InChI=1S/C18H15AsN6O8S.3Na/c26-19(27,28)17-11-15(25(29)30)7-10-18(17)23-24-22-14-3-1-12(2-4-14)20-21-13-5-8-16(9-6-13)34(31,32)33;;;/h1-11H,(H,22,23)(H2,26,27,28)(H,31,32,33);;;/q;3*+1/p-3/b21-20+;;; Key: ZMKJQESOJVXFDM-BFUOAJNWSA-K
SMILES O=[N+]([O-])c1ccc(N=NNc2ccc(/N=N/c3ccc(S(=O)(=O)[O-])cc3)cc2)c([As](=O)([O-])[O-])c1.[Na+].[Na+].[Na+]
Properties
Chemical formula	C18H14AsN6NaO8S
Molar mass	572.32 g·mol−1
Appearance	brick-red powder
Solubility in water	soluble
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Sulfarsazene is a chemical compound with the formula C₁₈H₁₂AsN₆Na₃O₈S, a metal indicator. ^[1]

Uses

Sulfarsazene is used as a metal indicator for the spectrophotometric and titrimetric determination of Pb²⁺ ions at pH 9.8–10.0 and Zn²⁺ at pH 9.3–9.6 (color transition from orange-pink to lemon yellow). ^{[2] [3] [4]}

Physical properties

Sulfarsazene is soluble in water, easily soluble in an aqueous solution of sodium tetraborate, slightly soluble in 95% alcohol, practically insoluble in acetone, chloroform, benzene.

See also

• Chrysophenine
• Bromothymol blue
• Litmus
• Methyl orange
• Phenolphthalein
• pH indicator
• Universal indicator

References

1. СССР, Министерство здравоохранения. Государственная фармакопея СССР (in Russian). Рипол Классик. p. 799. ISBN   978-5-518-07523-8 . Retrieved 18 April 2025.
2. Cheng, Kuang Lu; Ueno, Keihei; Imamura, Toshiaki (29 September 2017). CRC Handbook of Organic Analytical Reagents. Routledge. p. 242. ISBN   978-1-351-45721-7 . Retrieved 18 April 2025.
3. Castillo, E.; Cortina, J. L.; Beltrán, J.; Prat, M. D.; Granados, M. (July 2001). "Simultaneous determination of Cd(II), Cu(II) and Pb(II) in surface waters by solid phase extraction and flow injection analysis with spectrophotometric detection". The Analyst . 126 (7): 1149–1153. Bibcode:2001Ana...126.1149C. doi:10.1039/b100871o. ISSN   0003-2654. PMID   11478651.
4. Toroptsev, Academician I. V.; Eshchenko, V. A. (1 September 1971). "Histochemical detection of zinc by means of sulfarsazene" . Bulletin of Experimental Biology and Medicine. 72 (3): 1097–1099. doi:10.1007/BF00802415. ISSN   1573-8221 . Retrieved 18 April 2025.