利用吡啶衍生物主配体共轭效应调控铱配合物发光颜色
Color Tuning of Iridium Complexes by Using Conjugative Effect of Pyridine-derived Cyclometalated Ligands
作者单位E-mail
吴晨 南京大学化学化工学院, 配位化学国家重点实验室, 南京微结构国家实验室(筹), 南京 210093  
薛莉莎 南京大学化学化工学院, 配位化学国家重点实验室, 南京微结构国家实验室(筹), 南京 210093  
李天一 南京大学化学化工学院, 配位化学国家重点实验室, 南京微结构国家实验室(筹), 南京 210093  
张松 南京大学化学化工学院, 配位化学国家重点实验室, 南京微结构国家实验室(筹), 南京 210093  
郑佑轩 南京大学化学化工学院, 配位化学国家重点实验室, 南京微结构国家实验室(筹), 南京 210093 yxzheng@nju.edu.cn 
摘要: 利用2-苯基吡啶及其衍生物为主配体、四苯基膦酰亚胺为辅助配体合成了3个铱配合物Ir(ppy)2tpip(Hppy:2-苯基吡啶,Htpip:四苯基膦酰亚胺)、Ir(npy)2tpip(Hnpy:2-(1-萘基)吡啶)和Ir(pnpy)2tpip(Hpnpy:2-(9-菲基)吡啶)。它们的结构通过1HNMR和MALDI-TOF质谱进行了表征,其中配合物Ir(ppy)2tpip还进一步通过晶体结构分析验证。主配体从苯环到萘环和菲环的改变增加了配合物的π共轭,减小了能级差,导致了3种配合物的磷光发射光谱从516nm红移到600和633nm(从绿光到红光),发光量子效率也从0.36增加到0.51和0.53。从量化计算的结果可以看出,这种共轭效应增加了主配体的电子密度,提高了配合物的LUMO能级。配合物结构和发射性质之间的关系规律为设计不同发光颜色的铱配合物提供了思路。
关键词: 配位化学  铱配合物  主配体  共轭效应  磷光发射  红移
基金项目: 南京大学创新训练(No.G1210284036)和国家自然科学基金(No.20971067)资助项目。
Abstract: Using pyridine-derived cyclometalated ligands and tetraphenylimidodiphosphinate (Htpip) ancillary ligand, three iridium complexes of Ir(ppy)2tpip (Hppy=2-phenylpyridine), Ir(npy)2tpip (Hnpy=2-(naphthalene-1-yl)pyridine) and Ir(pnpy)2tpip (Hpnpy=2-(phenathren-9-yl)pyridine) were synthesized. Their structures were deter-mined by 1H NMR, MS(MALDI-TOF), and the complex Ir(ppy)2tpip was also characterized by crystal structure analysis. Extended π conjugation in cyclometalated ligands leads to narrower bandgap resulting in the red shift emission from 516 nm to 600, 633 nm (from green to red). Consequently, when the cyclometalated ligands change from ppy to npy and pnpy, the quantum efficiencies of the complexes are also improved to 0.36, 0.51 and 0.53, respectively. The conjugative effect of the aromatic rings affects the electron density of heterocycle pyridine and thus increases the energy of LUM Oas evidenced by the spectroscopic data and the computational calculation results. The regular patterns between the ligand structure and the emission can be applied for designing novel iridium complexes with various colors.
Keywords: coordination chemistry  iridium complex  cyclometalated ligand  conjugative effect  phosphorescence  bathochromic-shift
投稿时间:2013-12-12 修订日期:2014-01-06
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吴晨,薛莉莎,李天一,张松,郑佑轩.利用吡啶衍生物主配体共轭效应调控铱配合物发光颜色[J].无机化学学报,2014,30(5):969-976.
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