4,4′-联吡啶桥联的三个铜有机膦酸配合物的合成、结构及磁性（英文）

Syntheses,Structures and Magnetic Properties of Three Copper Phosphonates Bearing 4,4′-Bipyridine Bridge

在水热条件下,以N-氧化-2-吡啶膦酸(H2L)为主配体,4,4′-联吡啶(bpy)为桥联配体,合成了3个铜有机膦酸配合物:{[Cu(L)(bpy)0.5(H_2O)]·2H_2O}n(1),{[Cu(HL)2(bpy)]·4H_2O}n(2)和{[Cu2(L)2(bpy)]·3H_2O}n(3)。配合物1中,相邻的铜离子由2个膦酸根连成二聚体,二聚体之间通过bpy桥联成一维链。配合物2中,单核[Cu(HL)2]被bpy连接成一维链。配合物3中,四聚体[Cu2(L)2]2被bpy连接成"砖块状"结构的二维层。磁性研究表明,配合物1和3中铜离子之间存在反铁磁性耦合。

Three copper phosphonates {[Cu（L）（bpy）0.5（H2O）]2H2O}n （1）, {[Cu（HL）2（bpy）]4H2O}n （2） and {[Cu2（L）2（bpy）]3H2O}n（3）（H2L=2-pyridyl-N-oxide phosphonic acid, bpy=4,4＇-bipyridine） were synthesized under hydrothermal conditions. In compound 1, the adjacent Cu（Ⅱ） ions are connected by two phosphonate ligands into a dimer, which are bridged by bpy into 1D chain. Compound 2 has a 1D chain structure with[Cu（HL）2] as junction and bpy as linker. Compound 3 has a brick-like 2D structure with[Cu2（L）2]2 as junction and bpy as spacer. The magnetic property studies of compounds 1 and 3 reveal that antiferromagnetic interactions are mediated between the copper ions.