吨酮冠醚类配体及其稀土配合物的研究-化学、无机化学专业论文.docxVIP

11 11 兰州大学硕土毕业论文 何文杰 Abstract Rare-earth coordination polymers have drawn much attention in recent years ， mainly due to their luminescent properties and novel coordinational structures when different metal ions were coordinated to novelligands. In this dissertation ，two kinds of new xanthone-crown ether ligands and their +...rare-earth complexes wi由 Pr奸、 Eu3 +... 3 Gd+... Gd Tb3  have been synthesized and +characterized by elementa1 analysis and IR spectra. Crystal 剑ruc阳res of three complexes were determined by X-ray diffraction analysis. The luminescent properties of the complexes have also been investigated. + :Ligand LI : 3-e由oxy-l ，也(3，6，9-Trioxaundecane-l ，ll -diylioxy)xanthone Ligand L2: 3-benzyloxy-l ，8-(3，6，9-Trioxaundecane-l ，ll-diylioxy)xanthone Crystal structures of (Gd-LI)cH3CN 、(T-bLI)cH3CN 、(Pr-L2)DMF show that the ions are located on one side of the macrocycle and the carbonyl oxygen coordinated to the ions is bent out of the xanthone plane. Every ion is eight coordinated by one nitrogen of CH3CN at axial positions ，three oxygens from three water molecules and four ligand oxygens in CH3CN and the geometry around ions is a distorted two-capped trigonal prism，but it is different in DMF. The general formulas are: [RE.L(CH3CN)(H20)3l(CI04)3 and [RE.L(DMF)2(H20)(CI04)]-(CI04)2 The luminescent properties ofthe complexes: Photoluminescence studies of europium and terbium complexes show that the terbium perchlorate complexes with L I and L2 in CH3CN display higher intense emission while the other do not. ηle energy levels of the triplet state of the ligands were determined and the results indicate that the triplet states of the ligands match +better to Tb3 + than Eu3飞 The terbium complexe with L2 in CH3CN displays higher intense emission than with L1; The luminescent properties were inf1uenced by the solvent duo to the solvent effect . Keywords: Xanthone-crown ether ，Rare-earth ，Synthsis ，Crystal struc阳re ， Lu