新型N,O-双官能团席夫碱配体及其镉配合物的合成、晶体结构及荧光性质(英文)

Synthesis,Crystal Structure and Photoluminescent Properties of A Novel N,O-bifunctional Schiff-Base Ligand and Its Cadmium(Ⅱ) Complex

合成了一个新颖的席夫碱N,O-双管能团有机配体(4-(吡啶基-2-亚甲基氨基)苯甲酸,4,2-pmabaH)(1),并在水和乙醇体系中合成了它的镉配合物[Cd(4,2-pmaba)(H2O)3](4,2-pmaba).H2O(2)。利用元素分析及X-射线单晶结构测定对其进行了表征。标题化合物1属于正交晶系,Pna21空间群。化合物2属于正交晶系,Pbcn空间群。在化合物2中,Cd(Ⅱ)的配位环境为七配位。其中有2种不同配位模式的配体,其M2L2环状结构单元通过氢键作用连接成一个具有三维结构的超分子化合物。对化合物1,2的荧光性质也进行了测定。

A novel schiff-base ligand based on N,O-bifunctional coordination group and its cadmium（Ⅱ） complex, namely 4-（pyridin-2-ylmethylamino）benzoic acid （4,2-pmabaH）（1） and [Cd2（4,2-pmaba）2（H2O）6]（4,2-pmaba）2·2HaO（2）, respectively, were obtained in ethanol/water system. Both the ligand and complex were characterized by elemental analysis and X-ray crystal structure analysis. The ligand 1 crystallizes in orthorhombie, space group Pna21 with a=2.9131（6） nm, b = 1.0548（2）nm, c =0.72208（16） nm, V=2.2187（9） nm3, Z=8, Dc=1.367g·cm^-3, F（000）=960,μ=0.094 cm^-1, the final R=0.077 6, ωR=0.1858; in which C-H…π interactions play important roles in structural stabilization. While the complex 2 crystallizes in orthorhombie, space group Pbcn with a=1.335 39（12） nm, b = 0.944 24（8） nm, c =4.094 5（4） nm, V=5.162 9（8） nm^3, Z=8, Dc=1.644 g·cm^-3, F（000）=2 608,μ=0.904cm^-1, the final R=0.0649, ωR =0.1328. In complex 2, the coordination environment of Cd（Ⅱ） is a distorted pentagonal-bipyramid with N2O5 set. Two types of ligand with different conformations and coordination modes are found in complex 2. The M2L2 cyclic structural units in 2 are further connected by hydrogen bonds to give a three-dimensional structure. Their photoluminescent properties were also investigated. CCDC： 690113, 1; 690114, 2.