Helical Complexes Containing Diamide-Bridged Benzene-o-dithiolato/Catecholato Ligands
作者:Christian Schulze Isfort、Thorsten Kreickmann、Tania Pape、Roland Fröhlich、F. Ekkehardt Hahn
DOI:10.1002/chem.200601167
日期:2007.3.5
temperature with [TiO(acac)2] to give the triple-stranded helicate (PNP)4[Ti2(3)3] ((PNP)4[24]) as a mixture of two isomers, one with a parallel orientation of the ligand strands and one with an antiparallel orientation. Exclusively the triple-stranded helicates [Ti2(L)(3)](4-) ([25](4-), L=1(4-); [26](2-), L=4(4-)) are formed in the reaction of ligands H4-1 and H4-4 with [TiO(acac)2]. The molecular structures
苯-邻-二硫醇/邻苯二酚配体H4-2和H4-3与[TiO(acac)2]反应生成双核双链阴离子络合物[Ti2(L)2(mu-OCH3)2](2 -)([22](2-),L = 2(4-); [23](2-),L = 3(4-))。NMR光谱研究表明,络合物阴离子[Ti2(2)2(mu-OCH3)(2)](2-)是四种可能的异构体/对映体对中的三种的混合物,而该络合物只有一种异构体得到阴离子[Ti 2(3)2(μ-OCH3)(2)](2-)。(PNP)2 [Ti2(3)2(mu-OCH3)2]的晶体结构分析显示配体链平行取向,而(AsPh4)2 [Ti2(2)2(mu-OCH3)的结构确定)2]由于溶液中存在不同的异构体,不同的异构体可能共结晶以及晶体中的严重紊乱,因此未得出关于配体链取向的结论性结果。NMR光谱显示,配体H4-3在高温下与[TiO(acac)2]反应,得到三链螺旋(PNP)4