Cd-Ln杂双核配合物的合成、结构及发光性质

Syntheses,Structures and Luminescent Properties of Heterodinuclear Cd-Ln Coordination Compounds

采用混合溶剂热方法合成了3个新颖的杂双核d-f配合物,[LnCd(C8H7O3)5(phen)(H2O)](Ln=Dy(1),Pr(2),Gd(3);C8H7O3=对甲氧基苯甲酸根,phen=1,10-菲啰啉),通过单晶X射线衍射确定了配合物的晶体结构.结果表明,3个化合物是同构的.在同一个分子中,Cd2+与Ln3+通过3个对甲氧基苯甲酸根桥联,Cd2+为五配位,Ln3+为八配位.在晶体中,两个相邻的分子被氢键连成二聚体.测定了3个配合物在室温下的IR,UV-Vis-NIR以及激发和发射光谱.对比分析了化合物的UV-Vis-NIR吸收光谱与发射光谱的关系,讨论了d-块(d-L部分)对Ln3+发光的影响.

Three novel heterodinuclear d-f coordination compounds [ LnCd （ C8H7O3 ） 5 （phen） （ H2 O） ] （Ln = Dy 1, Pr 2, Gd 3; C8H7O3 =4-methoxy-benzoate; phen = 1, 10-phenanthroline） were synthesized by the hydrothermal method, and their structures were determined by single-crystal X-ray diffraction. They are isomorphous. In each molecule the Cd^2＋ ion is five-coordinated and the Ln^3＋ ion is eight-coordinated, which are bridged by three 4-methoxybenzoates. In addition, two neighboring molecules are connected with hydrogen bonds, forming dimers in their crystal. The IR, UV-Vis-NIR absorption, the excitation and emission spectra of the three complexes were determined at room temperature. The associations between the UV-Vis-NIR absorption spectra and the emission spectra of the complexes were analyzed and the influences of the d-block component on the luminescence of Ln^3＋ were discussed.