Studies On The Anion Sensing Luminescent Probe And The Relative Hybrid Materials Based On The Europium Complex

Rare earth ions(especially Eu3+and Tb3+) complexes possess excellent photoluminescence properties, owing to the electron energy level transition among4f electrons of rare earth ions. Combined with previous work, a novel quinoline-amide type ligand and its rare earth complex have been designed and synthesized. Thus, we have characterized their structure, researched luminescent properties of the europium complex in solid state and accomplished the anion-selective experiment. At the same time, in order to enhance the light stability and hydrothermal stability of pure rare earth complex, we selectively doped inorganic matrices including SiO2nanoparticle and SBA-15to prepare new luminescent hybrid materials.The thesis is divided into four parts:1. A brief review of investigation progress of rare earth luminescent complexes and their luminescent hybrid materials were summarized.2. The quinoline-amide type ligand and its rare earth complex have been designed and synthesized, using8-hydroxyquinoline as the skeleton. The composition and structure of the organic ligand and its rare earth complex have been characterized by elemental analysis, NMR, mass spectrometry, IR, molar conductance, and x-crystal diffraction. Crystal structure analysis of the [EuL(NO3)3] complex reveals that the Eu3+ion is wrapped by three oxygen atoms and one nitrogen atom of the ligand like a semicircle-shaped coordination structure. Subsequently, we studied the solid-state and solution luminescent properties of the complex.3. A novel europium(Ⅲ) complex([Eu-L](CF3SO3)3) has been designed and prepared. It exhibits high selectivity for the NO3-and Cl-anions in the acetonitrile solution. UV, luminescence titration experiments and the Job plot analysis demonstrate that the ligand can easily form stable1:1complexes with Eu(NO3)3and EuCl3in CH3CN. Therefore, on the basis of properties of the complex in CH3CN and crystal structure, we speculate a plausible displacement mechanism of the luminescence response of [Eu-L](CF3SO3)3to NO3-and Cl-.4. With silica nanoparticles and mesoporous SBA-15as inorganic matrix, two kinds of novel photoactive lanthanide (europium) hybrid materials with organic parts covalently bonded to inorganic parts via thiol-ene "click" reaction, have been assembled. They have been characterized by x-ray powder diffraction, TEM, TGA, and solid-state UV/Vis properties. Subsequently, we studied the fluorescence intensity and thermal stability based on different inorganic materials.The organics and the hybrid materials involved in the thesis are listed as follow:K:2-(4-((allyloxy)methyl)-1,3-dioxolan-2-yl)quinolin-8-olL:2-(2-(4-((allyloxy)methyl)-1,3-dioxolan-2-yl)quinolin-8-yloxy)-N,N-diisopropylacetamideMatrix-L-Eu(NO3)3: europium complex is introduced into inorganic matrix (SiO2and SBA-15) to form luminescent hybrid materials...