Triscyclometalated Iridium(III) Fluoro‐Substituted Carbene Complexes: Character of Emitting Triplet States and Excited State Dynamics
作者:Chien‐Yu Chen、Huei‐Ru Tsai、Kun‐Yi Lu、Husan‐Hsiao Yao、Yu‐Han Ou Yang、Chien‐Hong Cheng、I‐Chia Chen
DOI:10.1002/jccs.201300161
日期:2013.7
the spectra of UV‐vis absorption, emission and excitation for fluoro‐substituted triscarbene iridium complexes fac‐tris(1‐(4‐fluorophenyl)‐3‐methylimidazolin‐2‐ylidene‐C,C2′) iridium(III), fac‐Ir(fpmi)3, and fac‐tris(1‐(2,4‐fluorophenyl)‐3‐methyl imidazolin‐2‐ylidene‐C,C2′ ) iridium(III), fac‐Ir(dfpmi)3. The decay of emission and transient absorption curves at 266‐nm excitation in the singlet metal‐to‐ligand
我们报告了氟代三卡宾铱配合物fac -tris (1-(4-氟苯基)-3-甲基咪唑啉-2-亚基C,C 2')铱(III)的紫外可见吸收,发射和激发光谱,fac- Ir(fpmi)3和fac - tris (1-(2,4-氟苯基)-3-甲基咪唑啉-2-亚基-C,C 2')铱(III),fac- Ir(dfpmi)3。记录了单线态金属-配体电荷转移(MLCT)带区域在266 nm激发下的发射和瞬态吸收曲线的衰减。使用量子化学计算-密度泛函理论(DFT)和时变DFT(TD-DFT)方法B3LYP,我们获得了它们的优化几何形状,电子结构,垂直跃迁能量和振荡器强度。两种络合物均发出深蓝色/近紫外光,这对于铱络合物具有最高的发射能量。这些发射带在低温下显示出振动的结构和小的变色位移。根据测得的寿命数据和发射量子产率,我们获得辐射速率常数k r 2.2-2.4×10 4 s -1为发光状态和发光状态分配