摘要
为了研究配位聚合物的结构对其荧光性能的影响,选用低对称的2,6-二(2',4'-二羧基苯基)吡啶为有机配体,采用溶剂热法与Cd(NO3)2·4H2O在105℃下合成了一种新型金属有机荧光材料[(Cd2L)·DMF3·(H2O)2]n。通过X射线单晶衍射、热重分析、红外光谱,X射线粉末衍射对配合物的组成和晶体结构进行表征。结果表明,该配合物为单斜晶系,P21/c空间群,独立单元中包含2个Cd2+离子的二维层状结构,同时该配合物具有较高的热稳定性。通过荧光光谱仪,在激发波长334 nm条件下,对配体和该配合物的荧光性能研究发现,配合物的荧光发射峰相对于配体荧光发射峰发生了53 nm的蓝移,这是由于金属到配体的电荷跃迁(MLCT)导致在这一波长范围的变化。
In order to study the effect of the structure of coordination polymers on their fluorescence properties,a new metal-organic fluorescent material[(Cd2L)·DMF3·(H2O)2]n is synthesized by low symmetrical ligand,2,6-bis(2',4'-dicarboxyphenyl)pyridine,with Cd(NO3)2·4H2O under solvothermal conditions at 105℃.The crystal structure and composition of the complex are characterized by X-ray single crystal diffraction,thermogravimetric analysis,infrared spectroscopy and X-ray powder diffraction.The results show that the complex is an two-dimensional layer structure and crystallined in monoclinic system with space group P21/c,and the independent unit contains two Cd2+ions.At the same time,the complex has high thermal stability.Through the fluorescence spectrometer,upon excitation at 334 nm,the fluorescence properties of the ligand and the complex are studied.It is found that the fluorescence emission peak of the complex shows blue shifted of 53 nm compared with the ligand.It is the metal-to-ligand charge transition(MLCT)that causes the change in this wavelength range.
作者
薛凝
王豪
李明爽
丁涛
XUE Ning;WANG Hao;LI Ming-Shuang;DING Tao(School of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi’an 710048, China)
出处
《榆林学院学报》
2020年第4期12-16,共5页
Journal of Yulin University
基金
陕西省教育厅专项科学研究计划项目(18JK0346)。
关键词
配合物
荧光性能
蓝移
coordination polymers
fluorescence performance
blue shift
