| Abstract: Four binuclear rare earth complexes [Y2(p-MBA)6(Phen)2] (1), [Y2(p-ClBA)6(Phen)2] (2), [Pr2(BA)6(Phen)2](3) and [Pr2(p-ClBA)6(H2O)2(Phen)2](4)[Phen=o-Phenanthroline, p-MBA=4-Methylbenzoic acid, BA=Benzoic acid, p-ClBA=p-Chlorobenzoic acid] were synthesized with hydrothermal reaction. The structures of four complexes were determined by X-ray diffraction single crystal structure analyses. Four complexes are similar in the structure and coordination modes. For example, their structures all belong to the triclinic system, space group P1. Each rare earth ion is chelated by a Phen molecule, two rare earth ions are bridged by benzoic acid ligands or their derivatives in complex molecules. But, it is different in the number of bridged ligands and coordination modes. Besides that, in complex 4, hydrogen bonds are formed between coordinated water molecules and p-ClBA ligands, and the 2D layer net structure is formed by the hydrogen bonds. In addition, the UV-Vis-NIR, IR and fluorescence spectra of four complexes were measured and analyzed. Fluorescence spectra of complex 1 and 2 are assigned to LLCT and LMCT. The emissions of complex 3 and 4 have a mixed LMCT and LLCT character and a ffCT character of Pr3+. CCDC: 680944, 1; 680945, 2; 680946, 3; 680947, 4. |
