Synthesis, characterization and electronic effects investigations of new 5,7-disubstituted tris(8-quinolinolate)Al(III) complexes

• A series of 5,7-disubstituted tris(8-quinolinolate) Al(III) complexes containing EW/ED groups were prepared.
• The emission color of the new complexes influenced by the electronic environment of the aryl substituents.
• Measurements of AlQ3 complexes demonstrate clearly the possibility of tuning their emission color.

Eight 5,7-diaryl-8-hydroxyquinoline ligands were synthesized and characterized by 1H, 13C NMR spectroscopy and mass spectrometry. The electron-donating and electron-withdrawing aryl groups were attached to the 5- and 7-positions of the quinolinolate ring via Suzuki coupling reaction. The aluminum complexes of these ligands exhibited successful tuning in the emission color, covering a large segment of the visible spectrum.

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