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Synthesis, Crystal Structures and Characterization of Inorganic-organic Hybrid Materials with Different Dimensional Lanthanides Sulfates

Author: ZhangXiaoLiang
Tutor: JiangChunJie；XuYan
School: Liaoning Normal University
Course: Inorganic Chemistry
Keywords: Inorganic - organic hybrid materials Organic amines Structure-directing agent Crystal structure Fluorescence Properties
CLC: O621.3
Type: Master's thesis
Year: 2011
Downloads: 17
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Abstract


Inorganic - organic hybrid composite materials the excellent performance of the original composition of the inorganic and organic materials have potential applications in the field of electrical, fluorescence, catalytic, and has been extensively studied in recent years. Inorganic - Organic two components combine methods and the composition of the selected topics sulfuric acid and rare earth elements for inorganic components, templates and structure directing organic amines play the role, is expected to get a different dimension of rare earth sulphate inorganic - organic hybrid materials. Paper uses water heat and solvent hot synthesis method, the reactants through the regulation of different proportions, replacement of the organic components, to adjust the reaction was added sequentially, changing the crystallization temperature and adjusting the pH value or the like, expounded six been reported rare earth sulfate inorganic - organic hybrid materials, supplemented by single-crystal X-ray diffraction, infrared spectroscopy, X-ray powder diffraction, thermal gravimetric analysis, elemental analysis, characterization and fluorescence testing means to elaborate on the structure and performance. The main findings are as follows: 1 organic components in the compounds from the template agent. Ethylenediamine and dimethylamine template solvothermal synthesis of [Tb 2 (H 2 O) (SO 4 ) < sub> 6 ] [C 2 N 2 H 4 ] 1.5 (1), (C 2 H 8 N) 9 [Eu 5 (SO 4 ) 12 ] · 2H 2 O (2). Single crystal analysis indicated that the compound (1) is sulfuric acid having a two-dimensional layered structure terbium; sulfuric europium compound (2) having a three-dimensional pore structure, there are two different structures of the twenty rings a twenty ring is surrounded by ten ring; while the second approximate rectangular ring is separated by the helical chains. 2 organic components in the compound from the role of the structure-directing agent. Ethylenediamine, hydrazine sulfate, tetramethyl ammonium hydroxide, and dimethylamine structure directing agent, water, heat and solvothermal synthesis out [Zn 4 (OH) 12 < / sub> (SO 4 ) 2 ] · 8H 2 O (3), [Sm 2 (SO 4 ) 4 .5 H 2 O] · 4H 2 O (4), Eu 2 < / sub> (H 2 O) 4 (SO 4 ) 3 (5) and Er the 4 (μ 3 -O) 4 (SO 4 ) 4 (H 2 O) 3 (6). Monocrystalline analysis shows that the compound (3) (45, 62) of the cage for the building unit is formed having a two-dimensional dense layered topology zinc sulfate; compound (4) based on the dual-core Sm (SM 2 ) cluster is formed in the center of the novel two-dimensional layered sulfate samarium; compound (5) is sulfuric acid having a skeleton structure of the three-dimensional open europium; compound (6) to four nuclear ER (ER 4 ) sulfuric acid erbium cluster center to form a three-dimensional open-framework. 3 compound (5) with a strong fluorescence properties at room temperature, the strongest emission peaks at 616nm corresponding for Eu (III) ions in 5 D 0 → 7 F 2 transition. The strong fluorescence interpretable bridge SO 4 connected Eu-OS layer forming a three-dimensional skeleton, effective to increase the rigidity between the Eu atom, reducing the energy loss caused by thermal vibration.

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Organic Chemistry general issues > Synthetic organic chemistry
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