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以吡啶-2,6-二甲酸为起始原料,经酯化后与N-(3-氨基丙基)咪唑反应合成了有机配体分子吡啶-2,6-二[N-(1’-咪唑基丙基)甲酰胺](L)及其锌(Ⅱ)、镉(Ⅱ)配合物。配体L的结构经1H NMR、13C NMR、IR、UV和元素分析表征,并采用单晶X-射线衍射方法确定了L的晶体结构,L属于正交晶系,Pbcn空间群,晶胞参数a=25.03(2),b=8.933(7),c=20.101(16),α=β=γ=90°,V=4495(6)3,Z=8,Dc=1.287g·cm-3,μ=0.095mm-1,F(000)=1856。通过元素分析确定锌(Ⅱ)、镉(Ⅱ)配合物的组成分别为(C19H23N7O2)2Zn2(ClO4)2·(CH3O)2·2H2O和(C19H23N7O2)2Cd2(ClO4)·(CH3O)3·2H2O,并采用对比分析的方法讨论了配位前后游离配体L和两种配合物的红外吸收光谱和紫外吸收光谱的谱学性质。
Using pyridine-2,6-dicarboxylic acid as the starting material, the organic ligand molecule pyridine-2,6-bis [N- (1’- Imidazolylpropyl) formamide] (L) and its zinc (II) and cadmium (II) complexes. The structure of ligand L was characterized by 1H NMR, 13C NMR, IR, UV and elemental analysis. The crystal structure of L was determined by single crystal X-ray diffraction. L belongs to orthorhombic system, Pbcn space group, unit cell parameter α = β = γ = 90 °, V = 4495 (6) 3, Z = 8, Dc = 1.287 g · Cm-3, μ = 0.095 mm-1, F (000) = 1856. The composition of zinc (Ⅱ) and cadmium (Ⅱ) complexes was determined by elemental analysis as (C19H23N7O2) 2Zn2 (ClO4) 2 · (CH3O) 2 · 2H2O and (C19H23N7O2) 2Cd2 (ClO4) · (CH3O) And the comparative analysis method was used to discuss the spectroscopic properties of the infrared absorption spectra and the ultraviolet absorption spectra of the free ligands L and the two complexes before and after coordination.