Two multidentate ditopic ligands L1 and L2 which contain both N-donor and crown ether units have been synthesised. The potentially octadentate ligand L1 forms a trinuclear heterometallic double helicate with Cu(I) and Zn(II) ([Zn2Cu(L1)2]5+), whereas L2 forms a tetranuclear heterometallic double helicate with the same metal ions ([Zn2Cu2(L2)2]6+). Both species have been characterised by 1H NMR, ESI-MS and single crystal X-ray crystallography. Reaction of [Zn2Cu2(L2)2]6+ with Ba2+ results in the coordination of the crown ether units giving the simple barium coordinated species [Zn2Cu2(L2)2Ba2]10+. However, reaction of [Zn2Cu(L1)2]5+ with Ba2+ deprograms the ligand and results in the formation of a mixture of species.
合成了两个含有 N-供体和
冠醚单元的多齿二位
配体 L1 和
L2。潜在的八齿
配体 L1 与 Cu(I) 和 Zn(II) ([Zn2Cu(L1)2]5+) 形成三核异
金属双螺旋,而
L2 与相同的
金属离子形成四核异
金属双螺旋 ([Zn2Cu2(
L2)2]6+)。这两种物质均已通过 1H NMR、ESI-MS 和单晶 X 射线晶体学进行了表征。 [Zn2Cu2(
L2)2]6+ 与 Ba2+ 的反应导致
冠醚单元配位,得到简单的
钡配位物种 [Zn2Cu2(
L2)2Ba2]10+。然而,[Zn2Cu(L1)2]5+ 与 Ba2+ 的反应会破坏
配体的程序并导致形成混合物。