含2,3-吡嗪二羧酸的镉配位聚合物的合成、晶体结构和荧光性质

在水溶液中合成了含2，3-吡嗪二羧酸配体的3个镉配位聚合物，{[Cd(pzdc)(2，2′-bpy)]·H₂O}_n(1)，{[Cd(pzdc)(2，2′-bpy)]2H₂O}_n (2)和{[Cd(pzdc)(H₂O)₂]·2H₂O}_n (3)。配合物1属单斜晶系，P2₁/c空间群；配合物2为单斜晶系，P2₁/n空间群；配合物3为单斜晶系，P2₁/c空间群。每个pzdc配体通过4个配位原子与3个金属Cd配位，在配合物1和2中形成了具有(4，8²)网格状的二维平面构型，而在配合物3中得到了一维链状和氢键3D网络结构。尽管配合物1和2的分子只是结晶水分子数目存在差异，且具有相同的(4，8²)网格状二维平面构型，但是他们的分子结构趋向存在很大差别。配合物1和3的荧光光谱均在415 nm处出现较强的发射峰。

Syntheses, Crystal Structures and Photoluminescence of Cd Coordination Polymers with 2,3-Pyrazinedicarboxylic Acid

Three Cd coordination polymers with 2,3-pyrazinedicarboxylic acid (pzdc) and N-donor ligand, {[Cd(pzdc) (2,2'-bpy)]-H2O}n (1), {[Cd(pzdc)(2,2'-bpy)]-2H2O}n (2) and {[Cd(pzdc) (H2O)2]-2H2O}n (3), have been synthesized and characterized. Complex 1 crystallizes in monoclinic, space group P21/c with a=1.082 47(8) nm, b = 1.443 01(9) nm, c=1.025 87(7) nm,β=98.433(3)°, V=1.585 10(19) nm3; complex 2 belongs to monoclinic, space group P21/n with a=1.171 9(5) nm, 6=1.191 8(4) nm, c=1.3595(6) nm,β=110.474(17)°, V=1.778 9(13) nm3; complex 3 crystallizes in monoclinic, space group P21/c with a=0.669 54(3) nm, b=0.773 24(3) nm, c=2.07060(12) nm, β=93.0504(16)°, V= 1.070 46(9) nm3. The X-ray diffraction structure analysis indicates that the pzdc ligand in these complexes is coordinated to three Cd atoms through its four donors, forming a (4,82) net 2D network structure in 1 and 2, while obtaining a 1D chain and hydrogen bonding 3D structure in 3. Complexes 1 and 3 both exhibit photoluminescent emissions at 415 nm (λex=313 nm). CCDC: 673389,1; 673390, 2; 673391,3.