Evaporable luminescent lanthanide complexes based on novel tridentate ligand

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• 作者：Chen WEI (魏 晨) ; Xiaonan YAO (姚肖男) ; Boxun SUN (孙博勋) ; Zelun CAI (蔡泽伦) ; Zifeng ZHAO (赵子丰) ; Mingxing CHEN (陈明星) ; Huibo WEI (卫慧波) ; ^{weihuibo@163.com} ; Zhiwei LIU (刘志伟) ; Zuqiang BIAN (卞祖强) ; ^{bianzq@pku.edu.cn} ; Chunhui HUANG (黄春辉)
• 关键词：luminescent complex ; lanthanide ; tridentate ; evaporable ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：35
• 期：1
• 页码：7-14
• 全文大小：2324 K
• 卷排序：35

文摘

A novel tridentate ligand N-(6-(diphenylphosphoryl)pyridin-2-yl)-2,2,2-trifluoroacetamide (DPPOPFA) was designed and synthesized. Crystal structure of the ligand revealed the “keto” form of ligand in solid state other than the “enol” one, and it was also found that two kinds of molecules with different conformations were connected by hydrogen bonding between amide N–H and phosphoryl P=O. This ionic ligand was used to coordinate a variety of lanthanide ions, forming neutral 3:1 complexes. Absolute overall quantum yields of these complexes in solid states were 36% for Eu(III), 29% for Tb(III) and 3% for Dy(III) with lifetimes of 1.1, 1.1 and 0.087 ms, respectively. The complexes had excellent thermal stability and did not decompose till 370 °C. And they could sublimate in vacuum (1×10−4 Pa) at 330 °C due to the weak molecular interaction.