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含醛基的对称/非对称Ir(III)配合物磷光分子发光颜色调控与机理研究

发表时间:2017-04-14  浏览量:1083  下载量:210
全部作者: 田转转,郭浩然,杨晓龙,周桂江
作者单位: 西安交通大学理学院
摘 要: 利用两种取代位置不同的醛基化2-苯基吡啶,合成含有醛基的4种对称/非对称结构的Ir(III)配合物磷光分子。光物理研究结果表明,通过改变醛基取代位置及配合物结构的非对称化均能实现对磷光发光颜色的调节,其中改变醛基取代位置更为有效,可使磷光发射波长发生大约100 nm的改变。在此基础上,通过理论计算对这一调控策略的机理进行详细研究,结果表明,醛基接受电子能力受其所取代位置的电子特性影响,当醛基取代于缺电子位时其接受电子能力增强,可以改变配合物磷光分子中电荷转移的方向,生成更稳定的金属配体的电荷转移(metal to ligand charge transfer,MLCT)激发态造成磷光发射波长明显红移。另外,非对称结构的Ir(III)配合物磷光分子发射波长也较对称配合物发生红移。
关 键 词: 配位化学;磷光配合物;发光颜色调控;醛基;非对称;取代位置
Title: Color tuning and mechanism for symmetric/asymmetric Ir(III) phosphorescent complexes bearing aldehyde group
Author: TIAN Zhuanzhuan, GUO Haoran, YANG Xiaolong, ZHOU Guijiang
Organization: School of Science, Xi’an Jiaotong University
Abstract: Employing two different 2-phenylpyridine-type ligands with aldehyde group, four symmetric/asymmetric Ir(III) phosphorescent complexes have been developed. Both changing the substitution position of the aldehyde group and asymmetric structure can tune the phosphorescence color of the Ir(III) phosphorescent complexes. Critically, changing the substitution position of the aldehyde group are much more effective in meeting the purpose, since the phosphorescent emission maxima can be shifted ca. 100 nm. Theoretical results indicate that the electron-accepting ability of the aldehyde group can be affected greatly by electronic features of its substitution position. When substituted on electron-deficient position, aldehyde group can change the orientation of the charge-transfer process to form more stabilized metal to ligand charge transfer (MLCT) states, which induce the red-shift effect in phosphorescence wavelength of the Ir(III) complexes. In addition, the phosphorescence wavelength for the asymmetric complexes exhibits red-shift effect compared with that of the symmetric analogs.
Key words: coordination chemistry; phosphorescent complex; emission color-tuning; aldehyde group; asymmetric; substitution position
发表期数: 2017年4月第7期
引用格式: 田转转,郭浩然,杨晓龙,等. 含醛基的对称/非对称Ir(III)配合物磷光分子发光颜色调控与机理研究[J]. 中国科技论文在线精品论文,2017,10(7):794-802.
 
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