Synthesis, characterization and DFT investigation of aluminum complexes of aryl- substituted-8-hydroxyquinoline
摘要:
New aryl substituted 8-hydroxyquinoline derivatives have been synthesized. The compounds were characterized by H-1, C-13-NMR spectroscopy and mass spectrometry. The aluminum complexes of these derivatives show strong green emission in the range 530-535 nm with high quantum yield compared to the parent tris (8-hydroxyquinolinato)aluminum(III) complex. The structure of the aryl-substituted 8-hydroxyquinoline aluminum complexes in the ground state have been optimized It the B3LYP/6-31G* level of theory. The parent 8-hydroxyquinoline has also been examined using this method with the same basis set. A clear correlation between the shortening of the Al-N bond and red shift in the fluorescence emission band was observed. We have also found that substitution at the 5 and 7 position of the 8-hydroxyquinoline ligand cause simultaneous energy lowering of both highest occupied molecular orbital and the lowest unoccupied molecular orbital with the 5, 7-aryl substituted derivatives exhibiting the greatest effect. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis, characterization and DFT investigation of aluminum complexes of aryl- substituted-8-hydroxyquinoline
作者:FakhrEldin O. Suliman、Saleh N. Al-Busafi、Moza Al-Risi、Khalifa N. Al-Badi
DOI:10.1016/j.dyepig.2011.06.033
日期:2012.3
New aryl substituted 8-hydroxyquinoline derivatives have been synthesized. The compounds were characterized by H-1, C-13-NMR spectroscopy and mass spectrometry. The aluminum complexes of these derivatives show strong green emission in the range 530-535 nm with high quantum yield compared to the parent tris (8-hydroxyquinolinato)aluminum(III) complex. The structure of the aryl-substituted 8-hydroxyquinoline aluminum complexes in the ground state have been optimized It the B3LYP/6-31G* level of theory. The parent 8-hydroxyquinoline has also been examined using this method with the same basis set. A clear correlation between the shortening of the Al-N bond and red shift in the fluorescence emission band was observed. We have also found that substitution at the 5 and 7 position of the 8-hydroxyquinoline ligand cause simultaneous energy lowering of both highest occupied molecular orbital and the lowest unoccupied molecular orbital with the 5, 7-aryl substituted derivatives exhibiting the greatest effect. (C) 2011 Elsevier Ltd. All rights reserved.