Synthesis, Structures And Photoluminescence Of Lanthanide Complexes Constructed From Mixed Polycarboxylate Ligands Of Rigid-Flexible/Rigid-Rigid

The synthesis, structures and properties of multi-functional lanthanide coordination polymers based on the construction of mixed polycarboxylate-containing ligands are our mainly work. The aim is to study the structural variety, the thermal stabilities and the fluorescence of mixed-polycarboxylate lanthanide coordination polymers. In the paper,22 lanthanide polycarboxylate polymers constructed from different novel organic ligands were described and discussed in detail. The structures of the complexes 1-22 were determined by the X-ray crystal diffractometer. All complexes are characterized by elemental analysis and IR spectrum. The thermal stabilities for some complexes were also analysized. For the complexes regarding Eu, Tb, Sm and Dy, we have a systematic investigation of the photoluminescence for them and also discuss the relationship between the structure and the photoluminescence properties. The chemical formulas of 22 complexes are as following: Note:H4bta = 1,2,4,5-Benzenetetracarboxylic acid; HBSA = benzene sulfonic acid; H2bdc =1,4-benzene-dicarboxylic acid; H2ox= oxalic acid; H2glu= glutaric acid; H2ad= adipic acidIn chapter three and four, we investigate the mixed-polycarboxylate lanthanide coordination polymers with novel structure and unique properties which were constructed from the same rigid ligand and three different flexible ligands. The aim is to discuss the effection of different flexible ligands on the conformation, photoluminescence properties and thermal stabilities of these complexes when the rigid linker is the same. Encouraged by the tranditional design notion of Ln+R+F(R = rigid ligand, F = flexible ligand), we have attempted to design some Ln+R+R complexes formed by two rigid-polycarboxylate ligands inorder to obtain lanthanide complexes with novel structure and higher photoluminescence efficiency. In chapter five, Some Ln+R+R complexes have been synthesized and the inflence of the mixed-rigid ligands on the photoluminescence properties have also been discussed.