Intriguing ‘Turn-on’ phosphorescent response in the near infrared region upon fluoride binding: Dipyrromethene chelating-based Triarylboryl‒Iridium(III) conjugates
作者:Ju Hyun Hong、Seonah Kim、Hyunhee So、Ji Hye Lee、Hyonseok Hwang、Kang Mun Lee
DOI:10.1016/j.dyepig.2020.108706
日期:2020.12
addition, fluoride titration experiments using these complexes showed gradually quenched absorption bands in the region of 300‒350 nm, corresponding to borane-centered CT transitions. Furthermore, 1H NMR experiments in THF-d8 for both complexes in the presence of fluoride sources revealed that the fluoride was bound to the dimesitylboryl moieties. Interestingly, upon the addition of fluoride, the PL
两种新型杂环金属铱(III)配合物,即(CN)2的Ir(BL)(IR1和亮点Ir2)(CN = 2-(2,4-二氟苯基)吡啶(dfphpy,为IR1)和2-苯基吡啶(phpy,对于Ir2)),合成并表征了被三芳基硼基二吡咯亚甲基辅助配体(BL)螯合的化合物。两种配合物在固态下的分子结构均通过单晶X射线衍射进行了全面分析,发现由以Ir(III)为中心的三芳基硼烷共轭体系组成。两种配合物的紫外可见吸收光谱均显示典型的1 MLCT(金属到配体的电荷转移)吸收带,其中心为λabs = 483 nm,除了约326 nm的以硼烷为中心的CT吸收带。这些配合物的光致发光(PL)光谱表明在近红外区(λem = 〜690 nm)发出磷光,这主要归因于3 MLCT跃迁(L = BL)。此外,使用这些配合物进行氟化物滴定实验表明,吸收带在300-350 nm范围内逐渐淬灭,与硼烷为中心的CT跃迁相对应。此外,THF-