Aryl 5-substitution of a phenyl-pyridine based ligand as a viable way to influence the opto-electronic properties of bis-cyclometalated Ir(iii) heteroleptic complexes
作者:Roberto Grisorio、Gian Paolo Suranna、Piero Mastrorilli、Marco Mazzeo、Silvia Colella、Sonia Carallo、Giuseppe Gigli
DOI:10.1039/c3dt50576f
日期:——
This manuscript reports on the synthesis, the photophysical study and the electroluminescent properties of a series of heteroleptic cyclometalated iridium(III) complexes based on 2,5-diaryl-pyridines as C^N cyclometalating ligands and acetylacetonate as ancillary ligand. The complexes were characterised by elemental analysis, ESI-MS, multinuclear NMR, TGA and electrochemistry. Their optical properties were investigated by UV-Vis and photoluminescence. DFT and TD-DFT calculations provided further insights into the effects of the 5-aryl substitution on the electronic and photophysical properties of the new complexes. The presence of suitable π-extended ligands exerts a beneficial effect on the performances of the corresponding solution-processed light-emitting diodes, leading to a maximum brightness of 10 620 cd m−2 at a current efficiency of 10.0 cd A−1.
本手稿报告了一系列异极环化铱(III)配合物的合成、光物理研究和电致发光特性,这些配合物以 2,5-二芳基吡啶为 C^N 环化配体,乙酰丙酮为辅助配体。这些配合物通过元素分析、ESI-MS、多核 NMR、TGA 和电化学进行表征。它们的光学特性通过紫外可见光和光致发光进行了研究。DFT 和 TD-DFT 计算进一步揭示了 5-芳基取代对新复合物的电子和光物理性质的影响。合适的 π-扩展配体的存在对相应的溶液处理发光二极管的性能产生了有利的影响,在电流效率为 10.0 cd A-1 时,最大亮度可达 10 620 cd m-2。