2-呋喃甲醛缩水杨酰腙锰配合物的晶体结构与荧光性质

Crystal Structure and Luminescent Properties of Mn( II) Complex with 2-Furaldehyde Salicylhydrazone Hydrazone

利用2-呋喃甲醛与水杨酰肼缩合成一种含有呋喃环的新型芳酰腙2-呋喃甲醛缩水杨酰腙L,将L与MnCl2·4H2O在乙醇-丙酮体系中反应得配合物MnL2Cl2,对配合物进行X-射线单晶衍射、X-射线粉末衍射、元素分析、核磁共振、红外光谱、紫外光谱、热重分析、荧光光谱表征。结构分析表明配合物MnL2Cl2呈现扭曲八面体构型,属于单斜晶系,空间群P21/c,晶胞参数a=0.8225(8)nm,b=1.9079(17)nm,c=1.8638(14)nm,β=115.40(3)°,V=2.642(4)nm3,Z=4。配合物分子通过分子间氢键和苯环面对面π…π作用力形成二维链状结构,继而在层与层之间通过边对面π…π作用力构成三维层状超分子结构。热重分析表明,该配合物有较高的热稳定性;荧光光谱显示配体形成配合物后荧光性明显增强。

A new hydrazone ligand 2-furaldehyde salicylhydrazone hydrazone （L） has been synthesized from 2-furancarbaldehyde and salicyloylhydrazine. The metal complex MnL2Cl2 was also synthesized in ethanol-acetone system from the ligand and MnCl2 · 4H2O. It was characterized by XRD, EA, 1H NMR, FT-IR, UV, TGA and fluorescence spectroscopy methods. Structural analysis showed that the complex MnL2C12 showing distorted octahedral geometry, belongs to the monoclinic system, space group P21/c, with unit cell parameters a =0. 8225（8） nm, b = 1. 9079（17） nm, c = 1. 8638（14） nm, β = 115.40 （3）°, V = 2. 642 （4） nm3, Z = 4. The 2D chain structure was assembled through intermolecular hydrogen bonds and π…π stacking interactions of the benzene, and then constructed into 3D supramolecular structure via the π…π stacking interactions. The TGA showed that the complex has a higher thermal stability; fluorescence spectrum indicated the complex has significantly enhanced fluorescence to the ligand.