Coordination polymers of d10 metals and N,N′-bis(3-pyridinecarboxamide)-1,2-ethane
作者:Sebastian Muthu、John H. K. Yip、Jagadese J. Vittal
DOI:10.1039/b105696b
日期:2001.12.13
The ligands N,Nâ²-bis(3-pyridinecarboxamide)-1,2-ethane (L) was designed to form coordination polymers capable of assembling into 2-D network via complementary amide hydrogen bonds. The reactions of L with AgX (X = ClO4â, CF3SO3â or NO3â), Zn(ClO4)2·6H2O and Cd(ClO4)2·6H2O produced coordination polymers 1â5,the structures of which were characterized by single crystal X-ray diffraction. The polymer [AgL][ClO4]}â crystallized in two polymorphs 1A and 1B which consisted of coordination polymers [AgL]+}â in sine-wave and zigzag conformations,
respectively. In addition, the X-ray crystal structures of [AgL][CF3SO3]}â (2) and [AgL][NO3](H2O)1.25}â (3) showed coordination polymers in zigzag conformation similar to that of 1B. The polymers in compounds 1, 2 and 3 aggregate via complementary amide hydrogen bonds, forming corrugated sheets in the solid state. Furthermore, the compound trans-[ZnL2(H2O)2][ClO4]2·(H2O)2·CH3CN}â (4) was shown to be an infinite chain of [Zn2L2]
metallacycles. The stacking of the Zn polymer leads to the formation of a channel-like structure. The coordination polymer [CdL(H2O)3][ClO4]2}â (5) shows zigzag chains which are linked through hydrogen bonds between the anion, amide groups and coordinated water molecules. In contrast to its isomer L, the ligand N,Nâ²-bis(2-pyridinecarboxamide)-1,2-ethane (L1) formed segregated Ag(I) coordination polymer (6) in which the Ag ion is four coordinate.
配体N,N′-双(吡啶-3-甲酰胺)-1,2-乙烷(L) 旨在形成配合物聚合物,并通过互补的酰胺氢键自组装成二维网络。L与AgX (X = ClO4,CF3SO3 或NO3 ),Zn(ClO4 )2・6H2O和Cd(ClO4 )2・6H2O反应得到配合物聚合物1–5,其结构通过单晶X-射线衍射进行了表征。配合物[AgL][ClO4]} 结晶成两种多晶型物1A和1B,分别由类似正弦波和锯齿形状的[AgL]+}配合物聚合物组成。此外,[AgL][CF3SO3]} (2)和[AgL][NO3](H2O)1.25} (3)的X-射线晶体结构表明它们的配合物聚合物均呈锯齿形构型,与1B相似。化合物1,2和3中的配合物聚合物通过互补的酰胺氢键聚集,在固态形成褶皱的片层。此外,配合物trans-[ZnL2(H2O)2][ClO4]2・(H2O)2・CH3CN} 显示为[Zn2L2]金属环的无限链式结构。Zn配合物聚合物的堆积形成了一个类似通道的结构。配合物[CdL(H2O)3][ClO4]2} 呈现出锯齿形链,并通过阴离子、酰胺基团和配位水分子之间的氢键相互连接。与之相似配体L不同的是,配体N,N′-双(吡啶-2-甲酰胺)-1,2-乙烷(L1)形成的分离的Ag(I)配合物(6)中,Ag离子采取四配位构型。