Oligotriarylamines with a Pyrene Core: A Multicenter Strategy for Enhancing Radical Cation and Dication Stability and Tuning Spin Distribution
作者:Hai-Jing Nie、Chang-Jiang Yao、Jiang-Yang Shao、Jiannian Yao、Yu-Wu Zhong
DOI:10.1002/chem.201403847
日期:2014.12.22
transformed into radical cations 1⋅+–6⋅+ and dications 22+–62+, which feature strong visible and near‐infrared absorptions. Time‐dependent density functional theory studies suggested the presence of localized transitions from the pyrene radical cation and aminium radical cation, intervalence CT, and CT between the pyrene and amine moieties. Spectroscopic studies indicated that these radical cations and dications
单胺1,二胺2 - 4,三胺5,和四胺6已经通过在芘的1-,3-,6-和/或8-位取代基团dianisylamino合成。二胺2 - 4中的胺取代基的位置不同。没有芘芘相互作用的单晶填料是显而易见的3,4,和6。随着胺取代基数量的增加,第一氧化电位从单胺到四胺逐渐降低。这些化合物在CH 2 Cl 2中表现出强烈的电荷转移(CT)发射在约530 nm处具有48–68%的量子产率。在通过电解或化学氧化逐步氧化,这些化合物被转化成自由基阳离子1个⋅+ - 6个⋅+和双阳离子2 2+ - 6 2+,其功能强可见光和近红外吸收。随时间变化的密度泛函理论研究表明,from和胺基团之间存在from离子和and离子的局部跃迁,间隔CT和CT。光谱研究表明这些自由基阳离子和阳离子具有良好的稳定性。三胺5和四胺6与四氰基喹二甲烷在溶液中形成高效的CT络合物。EPR光谱和密度泛函理论计算的结果表明,指示2 2+