کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1324139 1499885 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Syntheses, crystal structure, photophysical property and theoretical study of a new series of iridium complexes with N-(diphenylphosphoryl)benzamide derivatives as the ancillary ligands
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Syntheses, crystal structure, photophysical property and theoretical study of a new series of iridium complexes with N-(diphenylphosphoryl)benzamide derivatives as the ancillary ligands
چکیده انگلیسی


• We synthesize Ir(III) complexes with N-(diphenylphosphoryl)benzamide derivatives.
• The complexes emit around 520 nm with various intensities and quantum efficiencies.
• The electronic structures of complexes are theoretically investigated.

Seven iridium complexes with the general structure of (tfmppy)2Ir(L1–L7) (tfmppy = 4-trifluoromethylphenylpyridine) were synthesized, where ancillary ligands L1–L7 are fluorine- or trifluoromethyl-substituted (–F or –CF3) N-(diphenylphosphoryl)benzamide derivatives. Single crystal X-ray diffraction study was undertaken on all complexes, which showed that each adopted the distorted octahedral coordination geometry with the conventional trans-N, cis-C arrangement in the coordination sphere. Electrochemical study confirmed the electron-withdrawing –F and –CF3 substituents on the ancillary ligands have effects on the IrIII/IV redox couples and HOMO/LUMO energy levels. Density functional theory (DFT) calculation results showed that the HOMOs are composed of Ir 5d orbital (about 55%) and π orbitals of the phenyl rings (about 38%) in tfmppy ligands, whilst the LUMOs are mostly localized on both the phenyl and pyridine rings of tfmppy (about 90%). All the complexes own the similar emission peaks around 520 nm with short phosphorescent decay time about 2 μs at ambient temperature and relatively high internal quantum efficiencies from 37.5 to 61.2%. This work showed that the iridium complexes with N-(diphenylphosphoryl)benzamide derivatives as the ancillary ligands possess the potential as phosphorence dopants in the organic light-emitting diodes (OLEDs).

Seven iridium complexes using N-(diphenylphosphoryl)benzamide derivatives as ancillary ligands were synthesized and investigated. All complexes own the similar emission peaks around 520 nm with various intensities and quantum efficiencies from 37.5 to 61.2%, suggesting the effects of the different substituted ancillary ligands.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Organometallic Chemistry - Volume 755, 1 April 2014, Pages 110–119
نویسندگان
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