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Efficient, scalable, and solvent-free mechanochemical synthesis of the OLED material Alq3(q = 8-Hydroxyquinolinate)

Ma, Xiaohe, Lim, Gin Keat, Harris, Kenneth David Maclean ORCID:, Apperley, David C., Horton, Peter N., Hursthouse, Michael B. and James, Stuart L. 2012. Efficient, scalable, and solvent-free mechanochemical synthesis of the OLED material Alq3(q = 8-Hydroxyquinolinate). Crystal Growth and Design 12 (12) , pp. 5869-5872. 10.1021/cg301291w

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The aluminum complex Alq3 (q = 8-hydroxyquinolinate), which has important applications in organic light-emitting diode materials, is shown to be readily synthesized as a pure phase under solvent-free mechanochemical conditions from Al(OAc)2OH and 8-hydroxyquinoline by ball milling. The initial product of the mechanochemical synthesis is a novel acetic acid solvate of Alq3, and the α polymorph of Alq3 is obtained on subsequent heating/desolvation of this phase. The structure of the mechanochemically prepared acetic acid solvate of Alq3 has been determined directly from powder X-ray diffraction data and is shown to be a different polymorph from the corresponding acetic acid solvate prepared by solution-state crystallization of Alq3 from acetic acid. Significantly, the mechanochemical synthesis of Alq3 is shown to be fully scalable across two orders of magnitude from 0.5 to 50 g scale. The Alq3 sample obtained from the solvent-free mechanochemical synthesis is analytically pure and exhibits identical photoluminescence behavior to that of a sample prepared by the conventional synthetic route.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Subjects: Q Science > QD Chemistry
Publisher: American Chemical Society
ISSN: 1528-7483
Last Modified: 24 Oct 2022 10:00

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