Synthesis of ligands containing N-oxide donor atoms and their assembly into metallosupramolecular structures
作者:Samantha J. Bullock、Lindsay P. Harding、Michelle P. Moore、Andrew Mills、Sean A. F. Piela、Craig R. Rice、Liz Towns-Andrews、Martina Whitehead
DOI:10.1039/c3dt00090g
日期:——
A series of ligands that contain both N-donor and N-oxide donor atoms have been synthesised and ligands L555, L666, L777 and L8888 contain, 4, 6, 5, and 6 donor atoms respectively. The smallest ligand L555 forms a mononuclear complex with Cu2+ ([Cu(L5)(ClO4)2(MeCN)]) whereas L666 and L777 form dinuclear double helicates with Ni2+ and Cu2+ respectively ([Ni2(L666)2]4+ and [Cu2(L777)2]4+). L8888 forms a tetranuclear cyclic helicate upon reaction with Co2+ ([Co4(L8888)4]8+) and in all cases the complexes are characterised by single-crystal X-ray diffraction and ESI-MS. The N-oxide units imparts flexibility in the ligand strand and where the unoxidised ligand strand forms a cyclic helicate, the incorporation of an N-oxide unit allows the formation of the dinuclear double helicate.
合成了一系列同时含有N-供体和N-氧化物供体原子的配体,配体L555、L666、L777和L8888分别含有4、6、5和6个供体原子。最小的配体 L555 与 Cu2+ 形成单核络合物 ([Cu(L5)(ClO4)2(MeCN)]),而 L666 和 L777 分别与 Ni2+ 和 Cu2+ 形成双核双螺旋 ([Ni2(L666)2]4+ 和 [ Cu2(L777)2]4+)。 L8888 与 Co2+ ([Co4(L8888)4]8+) 反应后形成四核环状螺旋,在所有情况下,复合物均通过单晶 X 射线衍射和 ESI-MS 进行表征。 N-氧化物单元赋予配体链柔性,并且在未氧化的配体链形成环状螺旋的情况下,N-氧化物单元的掺入允许形成双核双螺旋。