Naphthol Green B

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Naphthol Green B
Naphthol Green B bottle sample solution.jpg
Naphthol Green B in solid form and as aqueous solution.
Names
IUPAC name
Trisodium iron(III) 5-nitroso-6-oxidonaphthalene-2-sulfonate
Other names
Acid green 1
C.I. 10020
D and C Green 1
Properties
C30H15FeN3Na3O15S3
Molar mass 878.45 g/mol
Appearance Dark green powder
Odor Odorless
Soluble
Solubility Moderate soluble in aq. ammonia 25%, formic acid, HCl 37%, methanol
Insoluble in acetic acid, acetone, acetonitrile, chloroform, dichloromethane, ethanol, hexane, isobutanol, isopropanol, toluene, xylene
Hazards
Safety data sheet Santa Cruz Biotechnology
Lethal dose or concentration (LD, LC):
1.000 mg/l (fish, Oryzias latipes)[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Naphthol Green B is a nitroso dye, sodium salt of Naphthol Green Y, with the chemical formula C30H15FeN3Na3O15S3.

Properties

Chemical

Naphthol Green B dissolves in water, forming a green solution.

Physical

Naphthol Green B is a dark green or black-green solid, soluble in water. It is moderate soluble in some polar solvents, such as formic acid, hydrochloric acid, methanol, but insoluble in non-polar solvents, as well as glacial acetic acid. In hydrochloric acid it dissolves, turning yellow, due to the formation of iron chlorides.

Availability

Naphthol Green B is sold by various chemical suppliers. While there don't appear to be sellers on eBay, there are several on Amazon.

Preparation

Naphthol Green B is much cheaper to buy than synthesize.

Projects

  • Stain collagen

Handling

Safety

Naphthol Green B may stain green, so proper protection should be worn.

It is not classified as hazardous substance or mixture according to Regulation (EC) No. 1272/2008.

Storage

In closed bottles, away from corrosive vapors.

Disposal

Naphthol Green B can be neutralized with a strong oxidizing solution, such as chromic acid, Fenton's reagent or piranha solution, followed by neutralization of the leftover oxidizing agent and then poured down the drain. Since most of the Naphthol Green B neutralized this way is either as solution or traces, there is little risk of splashing.

References

  1. http://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?country=EN&language=EN-generic&productNumber=N7257&brand=SIGMA&PageToGoToURL=http%3A%2F%2Fwww.sigmaaldrich.com%2Fcatalog%2Fproduct%2Fsigma%2Fn7257%3Flang%3Den

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