Proton Affinities of Cationic Carbone Adducts [AC(PPh<sub>3</sub>)<sub>2</sub>]<sup>+</sup>(A=Halogen, Hydrogen, Methyl) and Unusual Electronic Structures of the Cations and Dications [AC(H)(PPh<sub>3</sub>)<sub>2</sub>]<sup>2+</sup>
作者:Wolfgang Petz、Istemi Kuzu、Gernot Frenking、Diego M. Andrada、Bernhard Neumüller、Maximilian Fritz、Jörn E. Münzer
DOI:10.1002/chem.201600525
日期:2016.6.13
This work reports the syntheses and the first crystal structures of the cationic carbone adducts [FC(PPh3)2]+ and [BrC(PPh3)2]+ and the protonated dication [FC(H)(PPh3)2]2+, which are derived from the carbone C(PPh3)2. Quantum chemical calculations and bonding analyses were carried out for the series of cations [AC(PPh3)2]+ and dications [AC(H)(PPh3)2]2+, where A=H, Me, F, Cl, Br, I. The bonding analysis
这项工作报告了阳离子碳加合物[FC(PPh 3)2 ] +和[BrC(PPh 3)2 ] +以及质子化指示物[FC(H)(PPh 3)2 ] 2的合成和第一晶体结构。+,是从碳C(PPh 3)2衍生而来的。对一系列阳离子[AC(PPh 3)2 ] +和离子[AC(H)(PPh 3)2 ] 2+进行了量子化学计算和键合分析,其中A = H,Me,F,Cl,Br,I。键合分析表明,阳离子最好描述为与中性有关的膦配合物L→(CA)+ ←L(L = PPh 3)最近分离出的亚硼烷基加合物L→(BA)←L(L =环状卡宾; A = H,芳基)。碳加合物[AC(PPh 3)2 ] +在碳上具有π电子孤对,可以轻松地质子化为[AC(H)(PPh 3)2 ] 2+。指示的计算表明,分子最好表示为复合物L→(CHA)2 + ←L(L = PPh 3),其中卡宾配位基被配体稳定。阳离子中甚至指示剂中的中心碳原