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PYROGALLOL RED

Chemical Properties

PYROGALLOL RED

CAS No.32638-88-3
Chemical Name:PYROGALLOL RED
CBNumber:CB1314191
Molecular Formula:C19H12O8S
Formula Weight:400.36
MOL File:32638-88-3.mol

PYROGALLOL RED Property

Melting point 133-134 °C(lit.)
Boiling point 309 °C(lit.)
Density 1.082 g/mL at 20 °C
vapor density 4.4 (vs air)
vapor pressure 10 mm Hg ( 167.7 °C)
refractive index n20/D 1.387
storage temp. Inert atmosphere,Room Temperature
solubility 1 M NH4OH: 10mg/mL, clear
pka 7.86±0.20(Predicted)
form Liquid
color Dark brown
Water Solubility Soluble in water, ammonium hydroxide (10 mg/ml), and ethanol.
BRN 363738
InChI InChI=1S/C19H12O8S/c20-12-7-5-10-17(15(12)22)26-18-11(6-8-13(21)16(18)23)19(10)9-3-1-2-4-14(9)28(24,25)27-19/h1-8,20-23H
InChIKey KUQNCHZOCSYKOR-UHFFFAOYSA-N
SMILES S1(=O)(=O)C2=CC=CC=C2C2(C3=C(C(O)=C(O)C=C3)OC3=C2C=CC(O)=C3O)O1
CAS DataBase Reference 32638-88-3
EPA Substance Registry System Spiro[3H-2,1-benzoxathiole-3,9'-[9H]xanthene]-3',4',5',6'-tetrol, 1,1-dioxide (32638-88-3)
UNSPSC Code 12171502
NACRES NA.47

Safety

Hazard Codes :Xn,Xi
Risk Statements :20/21/22-52/53-68-36/37/38
Safety Statements :36/37-61-24/25-22-36-26
RIDADR :UN 2811 6.1/PG 3
WGK Germany :3
RTECS :UX2800000
F :8
TSCA :Yes
HS Code :2934 99 90

NFPA 704:

	0
1		0

Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Hazard statements
Precautionary statements

PYROGALLOL RED Price More Price(7)

Brand: Sigma-Aldrich(India)
Product number: P8759
Product name : Pyrogallol Red
Purity:
Packaging: 5G
Price: ₹17640
Updated: 2022/06/14
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Brand: Sigma-Aldrich(India)
Product number: 1.07534
Product name : Pyrogallol red
Purity: metal indicator
Packaging: 1G
Price: ₹15130.01
Updated: 2022/06/14
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Brand: TCI Chemicals (India)
Product number: P0572
Product name : Pyrogallol Red
Purity:
Packaging: 1G
Price: ₹3000
Updated: 2022/05/26
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Brand: TCI Chemicals (India)
Product number: P1976
Product name : Pyrogallol Red [for Protein Research]
Purity:
Packaging: 1G
Price: ₹4000
Updated: 2022/05/26
Buy: Buy

Brand: TCI Chemicals (India)
Product number: P0572
Product name : Pyrogallol Red
Purity:
Packaging: 5G
Price: ₹8000
Updated: 2022/05/26
Buy: Buy

PYROGALLOL RED Chemical Properties,Usage,Production

Chemical Properties Also know nas pyrogallol and 1,2,3-trihydroxy-benzene,C6H3(OH)3 is white,lustrous crystals that turn gray on exposure to light. It is soluble in water,alcohol,and ether. A solution of pyrogallol acquires a brown color on exposure to air. This absorption of oxygen and change of color take place rapidly when the solution is made alkaline. Derivation is by heating gallic acid in an autoclave with three times its weight of water.
Uses are as a protective colloid in preparation of metallic colloidal solutions, photography, dyes, intermediates, synthetic drugs, medicine (antibacterial), process engraving, laboratory reagent, gas analysis (an oxygen absorber), reducing agent, and antioxidant in lubricating oils.
Chemical Properties dark brown powder
Uses The white powdery crystal was made by the superheating of gallic acid. Pyrogallic acid, popularly known as pyro, is one of the earliest developers and its use has spanned three centuries. It was first used in an acid state to physically develop wet collodion negatives. When silver bromide gelatin plates were adopted pyro was used again but in an alkaline state for chemical development. It was used throughout the 20th century and often chosen for the peculiar yellow stain it imparted to gelatin negatives.
Uses Pyrogallol Red is a complexometric indicator for the metal elements molybdenum and copper. Dyes and metabolites.
Purification Methods It is recrystallised from aqueous alkaline solution (Na2CO3 or NaOH) by precipitation on acidification, filter it off and dry in a vacuum. [Suk Collect Czech Chem Commun 31 3127 1966, Beilstein 19 H 407, 19 II 417, 19 III/IV 599, 19/10 V 226.]