Cd-Ln杂双核配合物的合成、结构及发光性质

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.

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

Three novel heterodinuclear d-f coordination compounds [LnCd(C8H7O3)5(phen)(H2O)](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 Cd2 ion is five-coordinated and the Ln3 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 Ln3 were discussed.