Ancillary Ligand Effects on Heteroleptic Ir
<sup>III</sup>
Dye in Dye‐Sensitized Photocatalytic CO
<sub>2</sub>
Reduction: Photoaccumulation of Charges on Arylated Bipyridine Ligand and Its Control on Catalytic Performance
作者:Ju Hyoung Jo、Sunghan Choi、Ha‐Yeon Cheong、Jae Yoon Shin、Chul Hoon Kim、Dae Won Cho、Ho‐Jin Son、Chyongjin Pac、Sang Ook Kang
DOI:10.1002/chem.202002575
日期:2020.12.15
Herein, we report the synthesis, and photochemical and ‐physical properties, as well as the catalytic performance, of a series of heteroleptic IrIII photosensitizers (IrPSs), [Ir(C^N)2(N^NAryl)]+, possessing ancillary ligands that are varied with aryl‐substituents on bipyridyl unit [C^N=(2‐pyridyl)benzo[b]thiophen‐3‐yl (btp); N^NAryl=4,4′‐Y2‐bpy (Y=−Ph or −PhSi(Ph)3]. We found that the π‐extension
在此,我们报告了一系列杂化Ir III光敏剂(IrPSs)[Ir(C ^ N)2(N ^ N Aryl)] +的合成,光化学和物理性质以及催化性能。具有在联吡啶单元[C ^ N =(2-吡啶基)苯并[ b ]噻吩-3-基(btp)上随芳基取代基而变化的辅助配体;N ^ N Aryl = 4,4'-Y 2 -bpy(Y = -Ph或-PhSi(Ph)3 ]。我们发现通过芳基取代作用使联吡啶配体的π延伸将联吡啶配体用作电子继电器单元在输送到催化中心之前进行了电荷积累,大大提高了整体CO2到CO转换活动。在典型的运行中,芳基取代的IRP(吨卜IRP-PH的Si)致敏均相体系(IRP的+回复我催化剂),得到1340(的转换数Φ CO = 24.2%)在光解的早期阶段(< 5小时)。这项研究表明辅助联吡啶配体上的π字符调制对于即将到来的催化性能至关重要。