8-Hydroxyquinoline
| 8-Hydroxyquinoline[1] | |
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Quinolin-8-ol, 8-Quinolinol |
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Other names
1-azanaphthalene-8-ol, Fennosan H 30, hydroxybenzopyridine, hoxybenzopyridine, oxychinolin, oxyquinoline, phenopyridine, quinophenol, oxine |
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| Identifiers | |
| CAS number | 148-24-3  |
| PubChem | 1923 |
| ChemSpider | 1847 |
| UNII | 5UTX5635HP |
| KEGG | D05321 |
| ChEBI | CHEBI:48981 |
| ChEMBL | CHEMBL310555 |
| ATC code | G01,A01AB07 D08AH03 R02AA14 |
| Jmol-3D images | Image 1 Image 2 |
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| Properties | |
| Molecular formula | C9H7NO |
| Molar mass | 145.16 g/mol |
| Appearance | White crystalline needles |
| Density | 1.034 g/cm3 |
| Melting point |
76 °C, 349 K, 169 °F |
| Boiling point |
276 °C, 549 K, 529 °F |
| Hazards | |
| MSDS | External MSDS |
| Main hazards | flammable |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
8-Hydroxyquinoline is an organic compound with the formula C9H7NO. It is a derivative of the heterocycle quinoline by placement of an OH group on carbon number 8. This light yellow compound is widely used commercially, although under a variety of names.[2][3]
Contents |
Synthesis [edit]
It is usually prepared from quinoline-8-sulfonic acid and from a Skraup synthesis from 2-aminophenol.[4]
As a chelating agent [edit]
8-Hydroxyquinoline is a monoprotic bidentate chelating agent. Related ligands are the Schiff bases derived from salicylaldehyde, such as salicylaldoxime, salen and salicylaldehyde isonicotinoylhydrazone (SIH). In neutral solution, the hydroxyl is in the protonated form (pKa=9.89) and the nitrogen is not protonated (pKa=5.13).[5] However, an excited-state zwitterionic isomer exists in which H+ is transferred from the oxygen (giving an oxygen anion) to the nitrogen (giving a protonated nitrogen cation).[6]
Applications [edit]
The complexes as well as the heterocycle itself exhibit antiseptic, disinfectant, and pesticide properties,[7][8] functioning as a transcription inhibitor.[9] Its solution in alcohol is used as liquid bandages. It once was of interest as an anti-cancer drug.[10]
The reaction of 8-hydroxyquinoline with aluminium(III)[11] results in Alq3, a common component of organic light-emitting diodes (OLED's). Variations in the substituents on the quinoline rings affect its luminescence properties.[12]
The roots of the invasive plant Centaurea diffusa release 8-hydroxyquinoline, which has a negative effect on plants that have not co-evolved with it.
Hydroxyquinoline was used as a stabilizer of hydrogen peroxide in a rocket fuel oxidizer (T-Stoff) for the German Messerschmitt Me 163 Komet in World War 2.
References [edit]
- ^ Nanjing Odyssey Chemicals
- ^ "8-Hydroxyquinoline Safety Data". Oxford University.[dead link]
- ^ "8-Hydroxyquinoline". PAN Pesticides Database.
- ^ Collin, G.; Höke, H. (2005). "Quinoline and Isoquinoline". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a22_465.
- ^ Albert, A.; Phillips, J. N. (1956). "264. Ionization Constants of Heterocyclic Substances. Part II. Hydroxy-Derivatives of Nitrogenous Six-Membered Ring-Compounds". Journal of the Chemical Society (Resumed) 1956: 1294–1304. doi:10.1039/JR9560001294.
- ^ Bardez, E.; Devol, I.; Larrey, B.; Valeur, B. (1997). "Excited-State Processes in 8-Hydroxyquinoline: Photoinduced Tautomerization and Solvation Effects". The Journal of Physical Chemistry B 101 (39): 7786–7793. doi:10.1021/jp971293u.
- ^ Phillips, J. P. (1956). "The Reactions of 8-Quinolinol". Chemical Reviews 56 (2): 271–297. doi:10.1021/cr50008a003.
- ^ "8-Hydroxyquinoline". Medical Dictionary Online.
- ^ "8-Hydroxyquinoline". Sigma-Aldrich. Retrieved 2012-05-23.
- ^ Shen, A. Y.; Wu, S. N.; Chiu, C. T. (1999). "Synthesis and Cytotoxicity Evaluation of some 8-Hydroxyquinoline Derivatives". Journal of Pharmacy and Pharmacology 51 (5): 543–548. doi:10.1211/0022357991772826. PMID 10411213.
- ^ Katakura, R.; Koide, Y. (2006). "Configuration-Specific Synthesis of the Facial and Meridional Isomers of Tris(8-hydroxyquinolinate)aluminum (Alq3)". Inorganic Chemistry 45 (15): 5730–5732. doi:10.1021/ic060594s.
- ^ Montes, V. A.; Pohl, R.; Shinar, J.; Anzenbacher, P. Jr. (2006). "Effective Manipulation of the Electronic Effects and Its Influence on the Emission of 5-Substituted Tris(8-quinolinolate) Aluminum(III) Complexes". Chemistry - A European Journal 12 (17): 4523–4535. doi:10.1002/chem.200501403.
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