“π-Hole−π” Interaction Promoted Photocatalytic Hydrodefluorination via Inner-Sphere Electron Transfer
作者:Jingzhi Lu、Navneet S. Khetrapal、Jacob A. Johnson、Xiao Cheng Zeng、Jian Zhang
DOI:10.1021/jacs.6b08620
日期:2016.12.14
promotes the electron transfer against unfavorable energetics (ΔGET up to 0.63 eV) and initiates the subsequent HDF. The sterichindrance of Py and FA largely dictates the HDF reaction rate, pointing to an inner-sphere electron transfer pathway. This work highlights the importance of the size and shape of the photocatalyst and the substrate in controlling the electron transfermechanism and rates as well
我们描述了使用芘基光催化剂 (Py) 的多氟芳烃 (FA) 的无金属光催化加氢脱氟 (HDF)。Py 和 FA 之间微弱的“π-空穴-π”相互作用促进了针对不利能量的电子转移(ΔGET 高达 0.63 eV)并启动随后的 HDF。Py 和 FA 的空间位阻在很大程度上决定了 HDF 反应速率,指向内部球体电子转移途径。这项工作强调了光催化剂和基材的尺寸和形状在控制电子转移机制和速率以及整个光催化过程中的重要性。
Steric Inhibition of π-Stacking: 1,3,6,8-Tetraarylpyrenes as Efficient Blue Emitters in Organic Light Emitting Diodes (OLEDs)
作者:Jarugu Narasimha Moorthy、Palani Natarajan、Parthasarathy Venkatakrishnan、Duo-Fong Huang、Tahsin J. Chow
DOI:10.1021/ol7023136
日期:2007.12.1
The sterically congested tetraarylpyrenes 1-3, which can be readily accessed by Suzuki coupling, exhibit no-aggregation (pi-stacking) behavior in both solution and solid states. The indisposed tendency of 1-3 toward crystallization and their moderate molecular dimensions permit exploitation as blue light emitting materials in OLEDs with respectable device performances.