Tris(8-hydroxyquinolinato)aluminium
Chemical compound
From Wikipedia, the free encyclopedia
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.
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aluminium.jpg) | |
| Names | |
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| IUPAC name
Tris(8-hydroxyquinolinato)aluminium | |
| Other names
8-Hydroxyquinoline aluminium salt, Alq3, aluminium 8-hydroxyquinolinate, aluminium oxinate, | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.016.570 |
| EC Number |
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PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| C27H18AlN3O3 | |
| Molar mass | 459.43 |
| Appearance | Yellow powder |
| Melting point | > 300 °C (572 °F; 573 K) |
| insoluble in water | |
| Hazards | |
| GHS labelling: | |
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| Warning | |
| H315, H319, H335 | |
| P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Structure
Both the meridional and facial isomers are known as well as several polymorphs (different crystalline forms).[1]
aluminium(III)-from-xtal-2000-CM-3D-ellipsoids.png) | aluminium(III)-from-xtal-2003-CM-3D-ellipsoids.png) |
| Thermal ellipsoid model of mer-Alq3[2] | Thermal ellipsoid model of fac-Alq3[3] |
Synthesis
The compound is prepared by the reaction of 8-hydroxyquinoline with aluminium(III) sources[4]
- Al3+ + 3 C9H7NO → Al(C9H6NO)3 + 3 H+
The synthesis and precipitation are so efficient that this reaction is used in gravimetric analysis for aluminium.[5]
Applications
Alq3 is a common component of organic light-emitting diodes (OLEDs). Variations in the substituents on the quinoline rings affect its luminescence properties.[6]