2,3-吡啶二甲酸和1,4-二咪唑基丁烷构筑的Cd(Ⅱ)配合物的合成、晶体结构及荧光性质(英文)

Synthesis, Crystal Structure and Luminescence Property of A Cd(Ⅱ) Coordination Polymer Constructed from 2,3-Pyridine Dicarboxylic Acid and 1,1′-(1,4-Butanediyl)bis(imidazole)

合成了一个配位聚合物{[Cd(pdc)(bbi)]·2H2O}n(H2pdc=2,3-吡啶二甲酸,bbi=1,4-二咪唑基丁烷),利用元素分析、红外光谱和X-射线单晶衍射考察了配合物的结构。配合物中,Cd(Ⅱ)的配位数为5,每个Cd(Ⅱ)与1个吡啶二甲酸离子的1个羧基氧原子和吡啶氮原子,另1个吡啶二甲酸离子的1个羧基氧原子,以及2个1,4-二咪唑基丁烷的2个氮原子配位。吡啶二甲酸离子的配位方式可以表示为μ-(κ3N,O2∶O3),Cd(Ⅱ)与之连接形成一维骨架链[Cd(pdc)]∞。配体1,4-二咪唑基丁烷采用了"Ω"和"S"两种构型,它们进一步与中心原子配位形成三维网络结构。配合物为三重穿插的金刚石型网络结构,拓扑学符号为66。受光激发,该配合物在426 nm处有一个发射峰。

A coordination polymer, namely {[Cd（pdc）（bbi）] ·2HEO}n {H2pdc=2,3-pyridine dicarboxylic acid, bbi= 1,1＇-（1,4-butanediyl）bis（imidazole）}, has been prepared and characterized by elemental analysis, IR spectrum, and single crystal X-ray diffraction. In the complex, each Cd（Ⅱ） is five-coordinated by one carboxylate O and one pyridyl N atoms from one pde anion, one carboxylate O atom from another pdc anion, and two N atoms from two bib ligands. The coordination mode of pde ligands are described as μ-（K^3N,O^2：O^3）, and Cd atoms are bridged by them to form a 1D skeleton chain [Cd（pdc）]∞. The bbi ligands show ＂Ω＂ or ＂S＂ shaped conformations, and they further extend the structure into a 3D framework. The complex displays a 3-fold interpenetrating diamond framework with （66） topology. Under excitation, it can exhibit an emission peak at 426 nm.