Effect of Bridge Alteration on Ground- and Excited-State Properties of Ruthenium(II) Complexes with Electron-Donor-Substituted Dipyrido[3,2-<i>a</i>:2′,3′-<i>c</i>]phenazine Ligands
作者:Georgina E. Shillito、Christopher B. Larsen、James R. W. McLay、Nigel T. Lucas、Keith C. Gordon
DOI:10.1021/acs.inorgchem.6b01810
日期:2016.11.7
steric and electronic effects. The effect of the bridging group on the electronic properties of the systems was characterized using a variety of spectroscopic methods, including Fourier transform–Raman (FT-Raman) spectroscopy, resonance Raman spectroscopy, and transient resonance Raman (TR2) spectroscopy. These methods were used in conjunction with ground- and excited-state absorption spectroscopy, electrochemical
一系列Ru(II)2,2'-联吡啶(bpy)与电子接受性二吡咯并[3,2- a:2',3'- c ]吩嗪(dppz)配体与给电子三芳基胺偶联的配合物(TAA)组已经过调查。dppz和TAA之间的桥接单元的系统性改变使得人们可以探索如何通过距离以及空间和电子效应来扰动供体和受体之间的通信。使用多种光谱方法表征了桥接基团对系统电子性能的影响,其中包括傅立叶变换拉曼光谱(FT-Raman),共振拉曼光谱和瞬态共振拉曼(TR 2)。)光谱学。这些方法与基态和激发态吸收光谱,电化学研究和DFT计算结合使用。基态电子吸收光谱显示出桥接基团的明显变化,最低能量电子跃迁观察到的波长范围为449 nm至522 nm,并伴随着摩尔吸光度的大变化。对于大多数化合物,最低能量的弗兰克-康登状态被确定为自然是配体内电荷转移(ILCT)。还通过共振拉曼光谱法证实了高能金属-配体电荷转移(MLCT)Ru(II)→bpy