一种含Pr(Ⅲ)配聚物的合成、结构及光物理性能研究

Synthesis,structure and luminescent properties of a Pr(Ⅲ) coordination polymer

采用水热合成的方法,以邻苯二甲酸、己二酸为配体,合成了一种具有3D无限结构的Pr(Ⅲ)配位聚合物[Pr2(C8H4O4)2(C6H8O4)·4H2O]n(C8H4O4=邻苯二甲酸根;C6H8O4=己二酸根).通过X射线单晶衍射确定了该配聚物的晶体结构,结构分析表明该配聚物为三斜晶系,P1空间群,其不对称单元中含有2个不等效的Pr(Ⅲ)离子,配位数分别为8和9.在晶体中,Pr(Ⅲ)离子被邻苯二甲酸根和己二酸根连成了3D无限网状结构.在室温下,测定了其固态粉末的IR(红外),UV-Vis-NIR(紫外-可见-近红外)吸收光谱以及可见区和近红外区荧光激发和发射光谱,并对其进行了分析与指认.此外,该配聚物在近红外区表现出了Pr(Ⅲ)离子的特征发射,应主要归功于配体的敏化作用,并且该发射带与Pr(Ⅲ)离子的理论发射带相比出现了位移现象,也与配聚物的UVVis-NIR吸收光谱可相互佐证.

Using o-phthalic acid and adipic acid as ligands ,one Pr （Ⅲ ） coordination polymer , [Pr2（C8H4O4）2（C6H8O4）＆#183;4H2O]n ,has been synthesized by the hydrothermal method .Its structure is determined by single-crystal X ray diffraction ,and the structure analysis indicates that it crystalli-zes in the triclinic with space group P1 .In each asymmetric unit ,two crystallographic independent Pr（Ⅲ） ions exist ,and their coordination numbers are 8 and 9 ,respectively .In the crystal ,the Pr（Ⅲ） ions are bridged by o-phthalate and adipate ligands and form the 3D infinite structure .At room tem-perature in the solid state ,the IR ,UV-Vis-NIR absorbance spectra ,Vis and NIR excitation and emis-sion spectra of the polymer are measured and analyzed .The polymer exhibits characteristic emissions of the Pr （Ⅲ ） ion due to the sensitization of ligands .In comparison with the theoretical emission bands of the Pr（Ⅲ） ion ,the emission bands appear shift which are consistent with the corresponding absorption bands of the UV-Vis-NIR spectrum ,i .e .,the two spectra can be evidenced by each other .