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Synthesis, Structures and Properties of Rare Earth Metal Multinuclear Complexes Bridged by Pyridine-2,3,5,6-tetracarboxylic Acid

Author: RiZiWanGuLi·WuFu
Tutor: LuFanLi；CuiJianZhong
School: Tianjin University
Course: Organic Chemistry
Keywords: Pyridine - 2 ,3,5,6 - acid Rare earth metal ion complexes Three-dimensional structure
CLC: O627.3
Type: Master's thesis
Year: 2010
Downloads: 56
Quote: 0
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Abstract


In recent years, the pyridine carboxylic acids as metal organic complexes (MOFs) commonly used ligand complexes in the field of molecular sieves, optoelectronics, magnetic, chemical sensors has been extensive research and application. Since pyridine tetracarboxylic acid ligand point than pyridine dicarboxylic acid, pyridine acid increased while repeatedly bridged to form a high-dimensional complex. Rare earth metal ions with high coordination number and difficult to control the reaction, easier to get the molecular topology of functional materials. Thus This paper studies the pyridine acid structure and properties of the rare earth metal polynuclear complexes. In this paper, the hydrothermal method, pyridine-2 ,3,5,6 - from acid (H4pdtc) bridging ligand design and synthesis of Nd (III), Dy (III) metal complexes. By introducing small molecule ligand 4,4 '- bipyridine, design and synthesis of transition metal complexes of Ni (II), has not been reported for these three complexes. Using single-crystal X-ray diffraction techniques, determination and resolve their crystal structure: {K [the Nd (PDTC) (H 2 O)] · H 2 O} n (1), {K 2 [Dy (pdtc) (H 2 O)] 2 · 2H 2 O} n (2), {Ni 3 (Hpdtc) 2 (bpy) 2 · 4H 2 O} n (3). The nature of the complexes infrared spectroscopy, ultraviolet spectroscopy and differential thermal - thermal gravimetric analysis. Complexes (1), (2) in the orthorhombic system,, 2 the P2 1 2 1 space group, similar three-dimensional structure The three-dimensional structure. The two complexes, rare earth metal ions are eight-coordinated, each metal at the same time with four PDTC 4 - anion coordination. Each the PDTC 4 - anion with two rare earth metal ion chelating ligand and two other rare earth metal ion bridge linking ligand. (1), (2) has a main group metal, potassium ions K to participate in ligand were seven ligand and eight ligand to both the three-dimensional structure is different in the complex. Both \, Under acidic conditions, the heavy rare earth metals is not easy in the ligands, so the reaction solution pH to rely neutral. Complexes (3) belong to the monoclinic system, P2 1 / C space group, the three-dimensional structure. Of the complex, the ligand H 4 in PDTC does not completely deprotonated, small molecule ligand 4,4 '- bipyridine introduction of Ni (II) There are two ligand ( Ni1, Ni2). Ni1, Ni2 are six-coordinated degeneration octahedra with two Hpdtc 3 - ligand coordination. Each Hpdtc 3 - ligand to form a one-dimensional chain with Ni2 bridging by 4,4 '- bipyridine bridged to form a two-dimensional surface, the two-dimensional surface of each Hpdtc 3 - ligand with Ni1 bridged to form a three-dimensional structure.

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