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通过分子设计,经过几步大分子反应,在聚砜(PSF)侧链键合了双齿席夫碱(SB)配基,制得了双齿席夫碱配基功能化的聚砜(PSF-SB)。在此基础上,以PSF-SB为大分子配体,以邻菲咯啉(Phen)为小分子配体,与Eu(Ⅲ)离子螯合配位,分别制备了二元高分子-稀土发光配合物PSF-(SB)3-Eu(Ⅲ)与三元高分子-稀土发光配合物PSF-(SB)3-Eu(Ⅲ)-(Phen)1,采用红外光谱和紫外吸收光谱对配合物进行了表征。研究了配合物的荧光发射性能与发光机理。制备了配合物的固体薄膜,考察了固体薄膜的荧光发射性能。结果表明,大分子配基PSF-SB本身具有强的荧光发射,但与Eu(Ⅲ)离子配位后,其自身的荧光发射大为减弱,其与Eu(Ⅲ)离子所形成的二元或三元高分子-稀土配合物均能发射出很强的Eu(Ⅲ)离子的特征荧光,即键合在PSF侧链的双齿席夫碱配基能有效地产生分子内能量转移,强烈地敏化Eu(Ⅲ)离子的荧光发射。第二配体的协同配位效应与对配位水分子的置换作用使得三元配合物的荧光发射强度高于二元配合物。
Through molecular design, bishop Schiff base (SB) ligand was bonded to polysulfone (PSF) side chain after several steps of macromolecule reaction to prepare bidentate Schiff base functionalized polysulfone (PSF- SB). On this basis, PSF-SB was used as ligand and phenanthroline as ligand for coordination with Eu (Ⅲ) ions to prepare binary polymer-rare earth luminescence The complex of PSF- (SB) 3-Eu (Ⅲ) and ternary polymer-rare earth luminescent complex PSF- (SB) 3-Eu (Ⅲ) - (Phen) 1 were characterized by IR and UV- Characterized. The fluorescence emission properties and luminescence mechanism of the complexes were studied. The solid films of the complexes were prepared and the fluorescence emission properties of the solid films were investigated. The results showed that the macromolecule ligand PSF-SB has strong fluorescence emission itself, but its fluorescence emission is greatly weakened after complexed with Eu (Ⅲ) ion. Ternary macromolecules - rare earth complexes can emit strong Eu (Ⅲ) ions characteristic fluorescence, which is bonded to the PSF side chain bidentate Schiff base ligand can effectively produce intramolecular energy transfer, strongly Fluorescence Emission of Sensitized Eu (Ⅲ) Ion. The synergistic coordination effect of the second ligand and the displacement of the coordination water molecule make the fluorescence intensity of the ternary complex higher than that of the binary complex.