Synthesis and coordination chemistry of ortho-perfluoroalkyl-derivatised triarylphosphines
作者:Ben Croxtall、John Fawcett、Eric G. Hope、Alison M. Stuart
DOI:10.1039/b107390g
日期:2002.2.5
In order to establish the steric and electronic effects of fluorous ponytails in the ortho-positions of triarylphosphines the two novel phosphines, PPh2(2-C6H4C6F13) II and P(4-C6H4C6F13)2(2-C6H4C6F13) V, have been synthesised and their coordination chemistry investigated and compared with that of the ortho-trifluoromethyl-derivatised ligand, PPh2(2-C6H4CF3) VI. The single crystal X-ray structures of Ph2P(O)(2-C6H4C6F13) and Ph2P(O)(2-C6H4CF3), along with that of PPh2(2-C6H4CF3), are reported and
compared with each other. The large steric influence of the ortho-trifluoromethyl and -perfluorohexyl substituents results in the formation of the, normally, less-thermodynamically favoured trans-[PtCl2L2] complexes. Analysis of the single crystal X-ray structures of trans-[PtCl2PPh2(2-C6H4CF3)}2] 1, trans-[PtCl2PPh2(2-C6H4C6F13)}2] 2 and trans-[RhCl(CO)PPh2(2-C6H4CF3)}2] 4 reveals a larger cone angle for PPh2(2-C6H4CF3) (169°) than for PPh2(2-C6H4C6F13). An average cone
angle of 166° was calculated for the latter phosphine with values ranging from 164 to 168°.
为了确定三芳基膦邻位氟马尾辫的空间和电子效应,合成了两种新型膦 PPh2(2-C6H4C6F13) II 和 P(4-C6H4C6F13)2(2-C6H4C6F13) V,并研究了它们的配位化学并与邻三氟甲基衍生配体的配位化学进行了比较, PPh2(2-C6H4CF3) 六.报道了 Ph2P(O)(2-C6H4C6F13) 和 Ph2P(O)(2-C6H4CF3) 以及 PPh2(2-C6H4CF3) 的单晶 X 射线结构,并
相互比较。邻三氟甲基和全氟己基取代基的大空间影响导致通常情况下热力学上不太有利的反式-[PtCl2L2]络合物的形成。反式-[PtCl2PPh2(2-C6H4CF3)}2] 1、反式-[PtCl2PPh2(2-C6H4C6F13)}2] 2和反式-[RhCl(CO)的单晶X射线结构分析PPh2(2-C6H4CF3)}2] 4 显示 PPh2(2-C6H4CF3) 具有更大的锥角(169°) 高于 PPh2(2-C6H4C6F13)。平均锥体
对于后一种膦,计算出166°的角度,其值范围为164至168°。