Jie Zhang, Guoliang Dai, Fengshou Wu
Feb 1, 2016
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0
Influential Citations
18
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Journal
Journal of Photochemistry and Photobiology A-chemistry
Abstract
Abstract The condensation of 4-(diethylamino)-2-hydroxybenzaldehyde with 2,3-diaminomaleonitrile and benzene-1,2-diamine, respectively, afforded two donor–π–acceptor Schiff base ligands H 2 L 1 and H 2 L 2 . For comparison, the condensation of 3,5-di- tert -butyl-2-hydroxybenzaldehyde with 4-(trifluoromethyl)benzene-1,2-diamine produced the ligand H 2 L 3 . Subsequently, their corresponding platinum(II) complexes PtL 1 , PtL 2 and PtL 3 were prepared through the metallation of ligands with K 2 PtCl 4 . All the ligands and complexes were characterized by 1 H NMR, infrared spectroscopy and mass spectrometry. And their thermal stabilities, photophysical properties, and electrochemical behaviors were investigated in detail. These complexes show yellow to red emissions with the highest quantum yield of 8.6% for PtL 1 . The decay times in microsecond scale (1.97–2.35 μs) indicate their phosphorescence characteristics arising from the triplet state. The B3LYP density functional theory calculations shows that the HOMO–LUMO gaps of PtL 1 , PtL 2 and PtL 3 are 2.53, 3.07 and 2.78 eV, respectively, which are well consistent with their photophysical properties. With the advantages of preparative accessibility and high thermal stability, these new phosphorescent platinum(II) complexes are attractive as emissive layer in organic light-emitting diodes.