Thymol blue
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| Names | |
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| IUPAC name
4-[9-(4-hydroxy-2-methyl-5-propan- 2-yl-phenyl)-7,7-dioxo-8-oxa- 7λ6-thiabicyclo[4.3.0]nona-1,3,5-trien-9-yl]- 5-methyl-2-propan-2-yl-phenol
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| Other names
α-hydroxy-α,α-bis(5-hydroxycarvacryl)- o-toluenesulfonic acid γ-sultone; thymolsulfonephthalein
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | Lua error in Module:Wikidata at line 879: attempt to index field 'wikibase' (a nil value). Lua error in Module:Wikidata at line 879: attempt to index field 'wikibase' (a nil value). |
PubChem CID
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| Properties | |
| C27H30O5S | |
| Molar mass | 466.59 g·mol−1 |
| Appearance | Brownish-green crystal powder |
| Melting point | 221–224 °C (430–435 °F; 494–497 K) decomposes[1] |
| Insoluble | |
| UV-vis (λmax) | 594 nm (1st) 376 nm (2nd)[1] |
| Hazards | |
| Main hazards | Harmful |
EU classification (DSD) (outdated)
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 Xn N
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| NFPA 704 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
 verify (what is   ?)
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| Infobox references | |
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This article "Thymol blue" or parts of it are from Wikipedia, which is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License. The list of its authors can be seen in its edit history page. |
Thymol blue (thymolsulphonephthalein) is a brownish-green or reddish-brown crystalline powder that is used as a pH indicator. It is insoluble in water but soluble in alcohol and dilute alkali solutions.
| Thymol blue (pH indicator) | ||
| below pH 8.0 | above pH 9.6 | |
| 8.0 | ⇌ | 9.6 |
| Thymol blue (pH indicator) | ||
| below pH 1.2 | above pH 2.8 | |
| 1.2 | ⇌ | 2.8 |
Thymol blue transitions from red to yellow at pH 1.2–2.8, and from yellow to blue at pH 8.0–9.6; it is a component of Universal indicator.
At wavelength (378 - 382) nm, extinction coefficient > 8000 and at wavelength (298 - 302) nm , the extinction coefficient > 12000.[2]
Structures
Thymol blue has different molecular structures at different pH levels.
Safety
It may cause irritation, and its toxicological properties have not been fully investigated.[3]
Bibliography
- Merck. "Thymol Blue." The Merck Index. 14th ed. 2006. Accessed via web on 2007-02-25.
References
- ↑ 1.0 1.1 Thymol Blue
- ↑ "Product Specification". Thymol Blue- ACS reagent 1: 1. 9 October 2017. http://www.sigmaaldrich.com/Graphics/COfAInfo/SigmaSAPQM/SPEC/11/114545/114545-BULK_______SIAL_____.pdf.
- ↑ Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).
External links
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Wikimedia Commons has media related to Thymol blue. |
Categories:
- Pages with script errors
- Articles without EBI source
- Articles without KEGG source
- Articles without UNII source
- Articles with changed CASNo identifier
- ECHA InfoCard ID from Wikidata
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- Articles taken from Wikipedia
- PH indicators
- Commons category with local link different than on Wikidata
- Triarylmethane dyes
- Benzenesulfonates
- Phenol dyes
- Isopropyl compounds