Bromophenol blue
IUPAC: 2,6-dibromo-4-[3-(3,5-dibromo-4-hydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]phenol
| Formula / Notation | C19H10Br4O5S |
|---|---|
| CAS Number | 115-39-9 |
| Molecular Weight | 670.0 |
| Melting Point | Decomposes at 279 °C (An orange discoloration with formation of a green sublimate sets in at 210 °C) |
| Solubility | Soluble in acetic acid |
| Appearance | Odorless solid; Color varies (tan, orange, light pink, purple, or red) [CHEMINFO] Slightly soluble in water; [MSDSonline] |
| Also Known As | 2,6-dibromo-4-[3-(3,5-dibromo-4-hydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]phenol; 115-39-9; BROMPHENOL BLUE; Albutest; Tetrabromphenol Blue; 3,3',5,5'-Tetrabromophenolsulfonphthalein; 3',3'',5',5''-Tetrabromophenolsulfonephthalein; DTXSID6041682; NSC-7818; 3',3'',5',5''-Tetrabromophenolsulfophthalein |
| Category | Indicators |
What is Bromophenol blue?
Bromophenol blue is 3H-2,1-Benzoxathiole 1,1-dioxide in which both of the hydrogens at position 3 have been substituted by 3,5-dibromo-4-hydroxyphenyl groups. It is used as a laboratory indicator, changing from yellow below pH 3 to purple at pH 4.6, and as a size marker for monitoring the progress of agarose gel and polyacrylamide gel electrophoresis. It has also been used as an industrial dye. It has a role as a dye, an acid-base indicator and a two-colour indicator. It is a member of phenols, an organobromine compound, a 2,1-benzoxathiole, a sultone and an arenesulfonate ester.
Formula & Notation
IUPAC Name: 2,6-dibromo-4-[3-(3,5-dibromo-4-hydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]phenol
Other Names / Synonyms: 2,6-dibromo-4-[3-(3,5-dibromo-4-hydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]phenol; 115-39-9; BROMPHENOL BLUE; Albutest; Tetrabromphenol Blue; 3,3',5,5'-Tetrabromophenolsulfonphthalein; 3',3'',5',5''-Tetrabromophenolsulfonephthalein; DTXSID6041682; NSC-7818; 3',3'',5',5''-Tetrabromophenolsulfophthalein
Properties & Characteristics
Physical Data
| Property | Value |
|---|---|
| Melting Point | Decomposes at 279 °C (An orange discoloration with formation of a green sublimate sets in at 210 °C) |
| Molecular Weight | 670.0 |
| Solubility | Soluble in acetic acid |
| Appearance | Odorless solid; Color varies (tan, orange, light pink, purple, or red) [CHEMINFO] Slightly soluble in water; [MSDSonline] |
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Bromophenol blue is 3H-2,1-Benzoxathiole 1,1-dioxide in which both of the hydrogens at position 3 have been substituted by 3,5-dibromo-4-hydroxyphenyl groups. It is used as a laboratory indicator, changing from yellow below pH 3 to purple at pH 4.6, and as a size marker for monitoring the progress of agarose gel and polyacrylamide gel electrophoresis. It has also been used as an industrial dye. It has a role as a dye, an acid-base indicator and a two-colour indicator. It is a member of phenols, an organobromine compound, a 2,1-benzoxathiole, a sultone and an arenesulfonate ester.
Used as a pH indicator in acid-base titrations, analytical chemistry, and chemical education demonstrations.
May be irritant or toxic in concentrated form. Handle with care. Consult SDS before use.
The formula or notation for Bromophenol blue is: C19H10Br4O5S