8-Hyydroxyquinoline

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8-Hyydroxyquinoline[1]
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Names
IUPAC name
Quinolin-8-ol, 8-Quinolinol
Other names
1-azanaphthalene-8-ol, Fennosan H 30, hydroxybenzopyridine, hoxybenzopyridine, oxychinolin, oxyquinoline, phenopyridine, quinophenol, oxine
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
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KEGG
UNII
Properties
C9H7NO
Molar mass 145.16 g/mol
Appearance White crystalline needles
Density 1.034 g/cm3
Melting point
Boiling point
Hazards
Main hazards flammable
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

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]

Synthesis

It is usually prepared from quinoline-8-sulfonic acid and from a Skraup synthesis from 2-aminophenol.[4]

As a chelating agent

8-Hydroxyquinoline is a monoprotic bidentate chelating agent. Related ligands are the Schiff bases derived from salicylaldehyde, such as salicylaldoxime and salen. 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

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

  1. Nanjing Odyssey Chemicals
  2. "8-Hydroxyquinoline Safety Data". Oxford University.[dead link]
  3. "8-Hydroxyquinoline". PAN Pesticides Database.
  4. Collin, G.; Höke, H. (2005). "Quinoline and Isoquinoline". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a22_465.
  5. Template:Cite doi
  6. Template:Cite doi
  7. Phillips, J. P. (1956). "The Reactions of 8-Quinolinol". Chemical Reviews. 56 (2): 271–297. doi:10.1021/cr50008a003.
  8. "8-Hydroxyquinoline". Medical Dictionary Online.
  9. "8-Hydroxyquinoline". Sigma-Aldrich. Retrieved 2012-05-23.
  10. 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.
  11. 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.
  12. 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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cs:8-hydroxychinolin de:8-Hydroxychinolin fa:۸-هیدروکسی‌کینولین it:8-idrossichinolina hu:8-hidroxikinolin


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