论文部分内容阅读
以2,4′-联苯二甲酸(H2bpdc)和1,10-邻菲罗啉(phen)为配体,采用水热法合成一例三维超分子网状镉(Ⅱ)配合物[Cd(bpdc)(phen)2(H2O)]·6H2O(1)。通过单晶X射线衍射分析,元素分析和红外光谱分析表征化合物1的结构。单晶X射线衍射分析结果表明,化合物1属于三斜晶系,P1空间群,中心金属Cd(Ⅱ)离子呈现六配位扭曲八面体构型,通过两种氢键作用和π—π堆积作用形成三维超分子结构。同时,对化合物1进行固态/溶液以及不同温度下的荧光性能测试。以350nm为激发波长进行激发,298K固态时,化合物1在390nm处有强发射峰,呈现紫色荧光;77K固态时,化合物1的荧光光谱具有两个发射谱带,分别位于380和520nm处,是因为在低温时化合物1表现出精细结构。298K时,化合物1在DMSO溶液和CH3OH溶液中分别在380和375nm有最大发射,相对于固态最大发射波长发生蓝移,呈现紫色荧光。这均是基于中心金属微扰配体中心的π*→π跃迁发射。研究了化合物1固态和溶液的荧光寿命,化合物1荧光衰减过程包含双组分。298K条件下,化合物1在DMSO溶液中的寿命(τ1=1.73μs和τ2=14.07μs)比CH3OH溶液中的荧光寿命(τ1=1.21μs和τ2=12.44μs)长。此外,77K固态时的荧光寿命(τ1=1.96μs和τ2=16.11μs)长于298K的固态荧光寿命(τ1=1.20μs和τ2=11.34μs),这是因为低温条件下降低分子内部的非辐射跃迁,从而延长固态荧光寿命。
Hydrothermal synthesis of a three-dimensional supramolecular network of cadmium (Ⅱ) complexes [Cd (bpdc)] with 2,4’-biphenyldicarboxylic acid (H2bpdc) and 1,10-phenanthroline (phen) ) (phen) 2 (H2O)] 6H2O (1). The structure of Compound 1 was characterized by single crystal X-ray diffraction analysis, elemental analysis and infrared spectroscopy. The results of single crystal X-ray diffraction analysis show that compound 1 belongs to the triclinic and P1 space group, and the central metal Cd (Ⅱ) ions exhibit a hexacoordinated distorted octahedron structure. Through two kinds of hydrogen bonding and π-π stacking Formation of three-dimensional supramolecular structure. At the same time, compound 1 was tested for fluorescence performance in solid / solution and at different temperatures. Excited at 350nm. At 298K solid state, compound 1 has a strong emission peak at 390nm, showing purple fluorescence. At 77K solid state, the fluorescence spectrum of compound 1 has two emission bands at 380 and 520nm, respectively Because Compound 1 showed a fine structure at low temperatures. At 298K, compound 1 has maximum emission at 380 and 375nm in DMSO solution and CH3OH solution, respectively, and shows blue fluorescence with respect to the maximum emission wavelength of solid state. This is based on the π * → π transition emission from the central metal perturbation ligand center. The fluorescence lifetime of compound 1 in solid state and solution was studied. The fluorescence decay of compound 1 contained two components. The lifetime of compound 1 in DMSO solution (τ1 = 1.73μs and τ2 = 14.07μs) was longer than the fluorescence lifetime in CH3OH solution (τ1 = 1.21μs and τ2 = 12.44μs) at 298K. In addition, the fluorescence lifetime at 77K solid state (τ1 = 1.96μs and τ2 = 16.11μs) is longer than the solid state fluorescence lifetime of 298K (τ1 = 1.20μs and τ2 = 11.34μs) due to the decrease of non-radiative transitions inside the molecule at low temperatures , Thus extending the lifetime of solid-state fluorescence.