标题：Triarylboranes with a 2-Dimesitylboryl-2 '-(N,N-dimethylamino)biphenyl Core Unit: Structure-Property Correlations and Sensing Abilities to Discriminate Between F- and CN- Ions
作者：Wang, Chen; Jia, Jiong; Zhang, Wei-Ning; Zhang, Hong-Yu; Zhao, Cui-Hua
作者机构：[Wang, Chen; Jia, Jiong; Zhang, Wei-Ning; Zhao, Cui-Hua] Shandong Univ, Minist Educ, Key Lab Special Funct Aggregated Mat, Sch Chem & Chem Engn, Jinan 更多
通讯作者地址：[Zhao, CH]Shandong Univ, Minist Educ, Key Lab Special Funct Aggregated Mat, Sch Chem & Chem Engn, Jinan 250100, Peoples R China.
来源：CHEMISTRY-A EUROPEAN JOURNAL
关键词：charge transfer; cyanides; fluorides; sensors; triarylboranes
摘要：A series of triarylboranes, in which different substituents are introduced at the para position of the dimethylamino group of a 2-dimesitylboryl-2'-(N,N-dimethylamino)biphenyl core unit, have been comprehensively investigated to explore the effect of structural modification on photo-physical properties. The introduction of electron-accepting substituents would facilitate the HOMO -> LUMO charge transfer (CT) transition. In contrast, the intramolecular CT transition is significantly prohibited when electron-donating substituents are incorporated. Notably, the HOMO -> LUMO CT transition mainly consists of the transition from the electron-donating amino group to an electron acceptor other than boryl when a strong electron acceptor such as the dicyanovinyl group is present. This dicyanovinyl-substituted compound displays sensing abilities to discriminate fluoride and cyanide ions. In solution in THF, the fluoride ions first bind to the boron center, then attack the alpha-carbon atom of the dicyanovinyl group, whereas the cyanide anion acts on the electron-accepting centers in the reverse sequence. As a result, the absorption and emission change in different manners upon addition of fluoride and cyanide ions.