Preparation, characterization, and luminescence properties of dysprosium perchlorate with MABA-Si and phen or dipy complexes as well as SiO2@Dy(MABA-Si)L core-shell structure nanometermeter luminescent composites

Abstract

Two novel ternary rare earth complexes Dy(MABA-Si)·L2(ClO4)3·2H2O (L= Phen or Dipy) were prepared using HOOCC6H4N(CONH(CH2)3Si-(OCH2CH3)3)2 which was abbreviated or denoted as MABA-Si. MABA-Si was the first ligand, L was the second ligand. The corresponding two SiO2@Dy(MABA-Si)L nanometermeter luminescent composites were synthesized as well, and the silica spheres is the core, and the ternary rare earth complex Dy(MABA-Si)·L2(ClO4)3·2H2O was the shell layer, who was abbreviated or denoted as Dy((MABA-Si)L). The ternary complexes have been characterized by element analysis, molar conductivity, IR spectra and 1HNMR spectra. The results showed that the chemical formula of the complex was Dy(MABA-Si)·L2(ClO4)3·2H2O. The fluorescent spectra illustrated that the complexes displayed its characteristic luminescence in solid state, and the luminescence was superior than Dy3+. The core-shell structure of SiO2@Dy(MABA-Si)L nanometermeter luminescent composite was characterized by SEM, TEM and IR spectra. Based on the SEM photographs, the core-shell structure particles showed its regular microstructure including smooth surface, and good dispersity. The ternary complex coated on the mono-dispersed SiO2 spheres by self-assembly. The fluorescent spectra illustrated that the core-shell structure of SiO2@Dy(MABA-Si)L nanometermeter luminescent composites exhibited stronger fluorescent than the ternary complexes. The fluorescence lifetime of the complexes and core-shell structure composites was measured as well.