Bromcresol green
Revision as of 12:30, 27 April 2013 by (username removed)
Description
A reddish brown powder used as an acid-base indicator dye. In solution bromcresol green gives a yellow color below pH 3.8 and blue color above pH 5.4. It is used in the Pen Archivist's Pen pH sensitive marker and in strips A-D indicator strips.
Synonyms and Related Terms
Bromkresolgrn (Deut.); bromocresol green; 3,3',5,5'-tetrabromophenol-meta-cresolsulfonphthalein; 4,4'-(3H-2, 1-benzoxathiol-3-ylidene) bis [2,6-dibromo-3 methylphenol]S,S-dioxide
Other Properties
Soluble in ethanol, ether, ethyl acetate, benzene. Slightly soluble in water.
| Composition | C21H14Br4O5S |
|---|---|
| CAS | 76-60-8 |
| Melting Point | 218-219 |
| Molecular Weight | mol. wt. = 698.02 |
Hazards and Safety
Ingestion, inhalation and contact may cause irritation.
Mallinckrodt Baker: MSDS
Authority
- G.S.Brady, G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971
- Richard S. Lewis, Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1407
- Sigma Dyes, Stains and Natural Pigments, Infrared Library, Nicolet, 1991-1995 Comment: OMNIC: formula= C21H14Br4O5S, CAS= 76-60-8