Tris(8-hydroxyquinolinato)aluminium

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ImageFile = AlumQ3.png ImageSize = 150px
IUPACName = Tris(8-hydroxyquinolinato)aluminium
OtherNames = 8-Hydroxyquinoline aluminum salt, Alq3, Aluminum 8-hydroxyquinolinate, Aluminum oxinate,
Section1 = Chembox Identifiers
CASNo = 2085-33-8
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Section2 = Chembox Properties
Formula =C₂₇H₁₈AlN₃O₃
MolarMass = 459.43
Appearance = Yellow Powder
Density =
MeltingPt = >300 °C
BoilingPt =
Solubility = insol in water
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Tris(8-hydroxyquinolinato)aluminium is the chemical compound with the formula Al(C₉H₆NO)₃. Widely abbreviated Alq3, it is a coordination complex wherein aluminium is bonded in a bidentate manner to the conjugate base of three 8-hydroxyquinoline ligands. Both the meriodonal and facial isomers are known as well as several polymorphs (different crystalline forms). [Michael Cölle, Robert E. Dinnebier and Wolfgang Brütting "The structure of the blue luminescent -phase of tris(8-hydroxyquinoline)aluminium(III) (Alq3)" Chemical Communications 2002, pp. 2908-9. doi|10.1039/b209164j] The compound is prepared by the reaction of 8-hydroxyquinoline with aluminium(III) sources [Katakura, R.; Koide, Y. “Configuration-Specific Synthesis of the Facial and Meridional Isomers of Tris(8-hydroxyquinolinate)aluminum (Alq3)” Inorganic Chemistry 2006 volume 45,pp 5730-5732. doi|10.1021/ic060594s] :Al³⁺ + C₉H₆NOH → Al(C₉H₆NO)₃ + 3 H⁺

Alq3 is a common component of organic light-emitting diodes (OLED's). Variations in the substituents on the quinoline rings affect its luminescence properties. [Victor A. Montes, Radek Pohl, Joseph Shinar, Pavel Anzenbacher Jr. "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 2006, Volume 12, pp. p 4523-4535. doi|10.1002/chem.200501403]

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