| Six Ag-Ln heterometallic coordination polymers and six Ln coordination polymers weresynthesized by hydrothermal methods. The single-crystal of these coordination polymers wasobtained and their structure were determined by X-single crystal diffraction, their molecularformulas are presented as following:（1）{[EuAg（2,3-pdc）2（H2O）4]·2H2O}n（7）[Er（Hbidc）2（H2bidc）2（H2O）4]n（2）{[SmAg（2,3-pdc）2（H2O）4]·2H2O}n（8）[Er（OX）0.5（OH）2（H2O）]n（3）{[HoAg（2,3-pdc）2（H2O）4]·2H2O}n（9）{[Nd2（btec）1.5（H2O）8]·5H2O}n（4）[EuAg（3,4-pdc）2]n（10）{[Nd2（2,5-pdc）2（2,5-Hpdc）2·（H2O）4]·2H2O}n（5）[PrAg（3,4-pdc）2]n（11）{[Pr2（2,5-pdc）2（2,5-Hpdc）2·（H2O）4]·2H2O}n（6）[NdAg （Hbidc）2（H2O）4]n（12）[PrN（CH2COO）3（H2O）2]n·nH2OThe structural analyses reveal that Polymers （1）-（6） are Ag-Ln Coordination polymers with3D infinite structure, Ag+ions and Ln3+ions are bridged by2,3-pdc,3,4-pdc and H3bidcligands, respectively. Polymers （7）-（12） are six Ln（Ln=Nd， Pr， Er） coordination polymerswith different dimension infinite structure, which are bridged by rigid or flexible carboxylicacid ligands （benzene tetracarboxylic acid,2,5-pyridine dicarboxylic acid, benzimidazole-5,6-two carboxylic acid, ammonia and oxalic acid）, respectively.The luminescent properties of the coordination polymers were characterized by IRspectra, UV-Vis-NIR absorption spectra and fluorescence spectra. We comparatively analyzeand discuss the emission spectra of the coordination polymers. By comparison ofluminescence, it is found that the same ligand has different effects on the emissions ofdifferent Ln（Ⅲ） ions, however, the influence of different ligands on luminescence from thesame Ln（Ⅲ） ions is also obviously different. In the Ln coordination polymers, theintroduction of d-block metal of Ag+ions can increase the dimension of polymers, whichenhance the light-emitting of the coordination polymers. |
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