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Synthesis, Crystal Structure and Antimicrobial Properties of Rare Earths Aromatic Carboxylic Acid Complexes

Author: ChenZhiMin
Tutor: WangRuiFen
School: Hebei Normal
Course: Inorganic Chemistry
Keywords: Rare earths Complexes Aromatic carboxylic acids Crystal structure Antibacterial activity
CLC: O627.33
Type: Master's thesis
Year: 2009
Downloads: 250
Quote: 0
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Abstract


In this thesis, the seven kinds of aromatic carboxylic acid and 1,10 - phenanthroline ligands, synthesized four kinds of rare earth (La, Pr, Y, Yb) 28 ternary complexes. The EDTA titrimetric and elemental analysis (C, H, N), initially identified the composition. Means of the use of IR, TG-DTG, antibacterial activity experiments, conducted a preliminary structural characterization and properties of these complexes. Complexes, rare earth ions with an oxygen atom of a carboxyl group, and 1,10 - phenanthroline nitrogen atom to form a stable chemical bond. These complexes have better thermal stability, due to poor stability of the re-N-chemical bonds, so ligand phen is lost at lower temperatures, while the loss of temperature of the aromatic carboxylic acid ligands higher. Thermal decomposition of the complexes of the final (?) For the corresponding rare earth oxide. Measured by X-ray single crystal diffraction method, the 4 complexes [La (o-MBA) 3 phen] 2 · H 2 O (Ⅰ), [Pr (o-MOBA) 3 phen · H 2 O] 2 · 3H 2 O (Ⅱ), Pr (m-MOBA) 3 phen (Ⅲ) and Yb (m-MBA) 3 phen (IV) crystal structure. Exist, they are based on the dual-core molecules form complexes Ⅰ ~ Ⅲ are triclinic, P (?) Space group; complex Ⅳ belong to the monoclinic system, space group P2 (1) / c. Four complexes, 1,10 - phenanthroline ligand end base chelating with two nitrogen atoms and a the center rare earth ion ligand, while the carboxyl group of aromatic carboxylic acid ligands with the central rare earth ion ligand including end groups monodentate, the end groups chelating bidentate bridging bidentate bridging three teeth in four different ways. Rare earth chloride, the antibacterial activity of aromatic carboxylic acid ligands, phenanthroline, and 28 kinds of rare earth ternary complexes was comparative experiments show that the antibacterial activity of the complexes are stronger than the corresponding rare earth chloride, basically strong in the corresponding carboxylic acid ligand. The antibacterial activity of the experimental data shows that the strongest inhibition of E. coli in 28 kinds of rare earth complexes Y (p-MBA) 3 phen · H 2 of O weakest Yb (p-MOBA) 3 phen; pair the Staphylococcus aureus strongest inhibition (?) (MBA) 3 phen and Yb ( o-MBA) 3 phen, the weakest of Yb (BA) 3 phen. All of these studies, provide a scientific basis for the further development of new, efficient rare earth materials and rare earth aromatic carboxylic acid antibacterial antimicrobial.

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Elements in organic compounds > The first III group elements, organic compounds > Scandium family elements in organic compounds
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