Novel Cd(ii) coordination polymers with flexible disulfoxide ligands: effects of ligand spacers, terminal groups and counter anions on the complex framework formations
作者:Jian-Rong Li、Xian-He Bu、Ruo-Hua Zhang
DOI:10.1039/b316441a
日期:——
Five novel Cd(II) coordination polymers with three structurally related flexible disulfoxide ligands, [Cd(L1)3](ClO4)2}n
(1), [Cd(L2)3](ClO4)2(CHCl3)}n
(2), [Cd(L2)(NO3)2(H2O)]n
(3), [Cd2(L3)2(NO3)4]n
(4) and [Cd(L3)3](ClO4)2}n
(5), where L1
= 1,3-bis(phenylsulfinyl)propane, L2
= 1,4-bis(phenylsulfinyl)butane and L3
= 1,4-bis(ethylsulfinyl)butane, were synthesized and structurally determined by X-ray diffraction. Complex 1 has a 2D layer structure, in which part of the L1 ligands bridge the Cd(II) ions to form double-bridging chains and the other part of ligands link such chains to form a 2D framework. Complexes 2 and 5 are isomorphous, showing unusual 2D (3,6) network structures containing triangular grids. Complex 3 adopts a 2D (4,4) network formed by L2 linking the NO3− bridged (Cd–O–N–O–)n 1D zigzag chains. By contrast, 4 is a 1D chain, in which two Cd(II) centers are bridged by μ2-O of sulfoxide groups to form a dinuclear unit, and L3 ligands link such dinuclear units to form a 1D double-bridging chain. The structural differences among such complexes show that the ligand nature and counter anions have important influences on the complex structures, which may provide a rational method for controlling the framework formation in metal–organic coordination polymers.
五种新型 Cd(II) 配位聚合物,具有三个结构相关的柔性二亚砜配体,[Cd(L1)3](ClO4)2}n
(1), [Cd(L2)3](ClO4)2(CHCl3)}n
(2)、[Cd(L2)(NO3)2(H2O)]n
(3)、[Cd2(L3)2(NO3)4]n
(4) 和 [Cd(L3)3](ClO4)2}n
(5) 式中 L1
= 1,3-双(苯亚磺酰基)丙烷,L2
= 1,4-双(苯基亚磺酰基)丁烷和 L3
= 1,4-双(乙基亚磺酰基)丁烷,通过X射线衍射合成并确定结构。配合物1具有二维层状结构,其中部分L1配体桥接Cd(II)离子形成双桥链,另一部分配体连接这些链形成二维骨架。配合物 2 和 5 是同晶的,显示出包含三角形网格的不寻常的 2D (3,6) 网络结构。复合物3采用由L2形成的2D(4,4)网络,连接NO3−桥接(Cd-O-N-O-)n 1D锯齿形链。相比之下,4是一条一维链,其中两个Cd(II)中心通过μ2-O亚砜基团桥接形成双核单元,L3配体连接这些双核单元形成一维双桥链。此类配合物之间的结构差异表明配体性质和抗衡阴离子对配合物结构具有重要影响,这可能为控制金属有机配位聚合物中骨架的形成提供合理的方法。