Evaporable luminescent lanthanide complexes based on novel tridentate ligand

• Published in: Journal of rare earths 2017, Vol.35 (1), p.7-14
• Main Author: 魏晨 姚肖男 孙博勋 蔡泽伦 赵子丰 陈明星 卫慧波 刘志伟 卞祖强 黄春辉 Chun-Hua Yan
• Format: Article
• Language: English
• Subjects: Eu（Ⅲ）; evaporable; lanthanide; luminescent complex; rare earths; tridentate; 三齿配体; 分子间弱相互作用; 发光; 晶体结构; 稀土离子; 稀土配合物; 蒸发
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(16)60166-7

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 ＂enor＇ one, and it was also found that two kinds of molecules with different conformations were connected by hydrogen bonding between amide N-H and phos- phoryl 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 ℃. And they could subli- mate in vacuum （1 ×10^-4 Pa） at 330℃ due to the weak molecular interaction.