Abstract: 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.

Key words: Heterodinuclear Cd-Ln coordination compound, Synthesis, Crystal structure, Luminescent property