Association of enantiopure TRISPHAT anion (1) with chiral spiro [Cu(LL′)2] complexes (LL′ = 2-R-phen, 2, 6-R-bpy, 3, and 2-iminopyridine, 4) leads to an efficient NMR enantiodifferentiation. Variable temperature 1H NMR spectroscopy has been used to determine the isomerisation kinetics of these pseudo-tetrahedral complexes and to evaluate their configurational stability; the latter depending on the structure of the diimine ligands. In the case of the 2-anthracenyl-phen derivative, a decent level of supramolecular stereocontrol was noted (d.e. up to 45%); the configuration of the complex being determined by electronic circular dichroism (ECD).
与手性螺旋[Cu(LL′)2]复合物(LL′ = 2-R-
苯,2,6-R-bpy,3和2-亚
氨基吡啶,4)结合的手性纯TRI
SPHAT阴离子(1)导致了高效的NMR手性分离。采用可变温度1H NMR光谱法确定了这些伪四面体复合物的异构化动力学,并评估了其构型稳定性;后者取决于二
亚胺配体的结构。在2-
蒽基-
苯衍
生物的情况下,观察到相当程度的超分子立体控制(立体选择性高达45%);该复合物的构型通过电子圆二色性(
ECD)确定。