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Design and Investigation of Supermolecules with Betain Derivatives

Author: JiWeiZhuo
Tutor: LiSongLin
School: Tianjin University
Course: Physical and chemical
Keywords: 1, 3 - bis ( 4 - carboxy -pyridyl ) propane ( L ~~ 1 ) 2 - (3 - carboxy - pyridyl ) - ethyl ether (L ~ 2) α, α'- bis (4 - carboxy - pyridyl ) -1 , 4 - xylene (L ~ 3) α, α'- bis (3 - carboxy - pyridyl ) -1 , 4 - xylene ( L to 4) Coordination polymers Hydrogen bonds π-π stacking interactions
CLC: O629.4
Type: Master's thesis
Year: 2005
Downloads: 68
Quote: 0
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Abstract


In coordination polymers, metal ions, the ligand molecule are connected together, and they are arranged with a clear direction so that it can be a ligand having a specific function and structure are arranged in accordance with the advance in the manner envisaged up to thereby obtain complexes having a desired structure and function. Intermolecular interactions and recognition mechanism, non-key interactions such as hydrogen bonding, π-π stacking interactions, metal keys, metal - nonmetal weak interactions in the structure, function and stability of the designed and synthesized with the hope supramolecular played a very important role in the process of supramolecular assembly and special performance materials. In the experiment, synthetic five ligands, they are 1, 3 - bis (4 - carboxy-pyridyl) propane (L 1 ), 2 - (3 - carboxy-pyridyl) ethyl ether ( L 2 ), α, α'-two (4 - carboxy-pyridyl) -1, 4 - xylene (L 3 ), an α, α'-bis ( 3 - carboxy-pyridyl) -1, 4 - xylene (L the 4 ), and 1, 2 - two [2 - (4 - carboxy-pyridyl) ethoxy] ethane (L 5 ), and eleven of the first four ligands with metal salts coordination polymers, study their coordination ability of different metal salts and the ability to build a complex three-dimensional network structure. Eleven complexes: {[Cu L 1 (H 2 O) 4 ] · SO 4 · 2H 2 O} n (1), {[Cu L 2 1 ] · 2ClO < sub> 4 · 2H 2 O} n (2), {[Cu L 2 2 (H 2 O) 3 ] · 2ClO 4 · 2H 2 O} n (3), {[Mn L 2 2 (H 2 O) 2 ] · 2ClO < sub> 4 } n (4), {[Ag L 2 ] · NO 3 · 2H 2 < / sub> O} n (5), {[Ag 4 L 2 2 (CF 3 SO 3 ) 2 H 2 O] · 2CF 3 SO 3 < / sub> · 3H 2 O} n (6), {[Cu L 3 (H 2 O ) 3 ] · 2Cl · H 2 O} n (7), {[Cu L 2 3 (H 2 O) 2 ] · 2NO 3 } n (8), {[Cd L 2 3 ] · 2ClO 4 · 2H 2 O} n (9), {[Ag4 L 2.5 3 H 2 O] · 4CF 3 SO 3 · 3H 2 O} n (10), {[Ag L 4 ] · ClO 4 } n (11), and on them by single crystal X-ray diffraction structural analysis. Structural analysis showed that: (1) L 1 ligand in the coordination process showed cis (cis-L 1 ) and trans-(trans-L 1 ) in two different configurations, such a change of the structure so that the complex having a changeable network structure: cis-L is taken in 1 1 configuration to give 3D nested network structure, taken 2 is trans-L 1 configuration, the network structure having a rhombic cavity; (2) 1 and 2 are respectively obtained by the ligand, are copper salts, anionic different (: SO , 4 2 - 2: of ClO 4 - ) caused by differences in the network structure, the same 7 and 8 are ligand L 3 and CuCl 2 and Cu (NO , 3 ) 2 two copper salt formed structure is also different, indicating that the formation of the anion has an important impact on the process of coordination polymers. (3) L 2 and the ligand L [2 - (4 - carboxy-pyridyl) ethyl ether] inter-isomer, and the L both cis-and cis-have trans Trans- configuration, we get L 2 and the formation of complexes with four kinds of salt taken the same configuration, the cis-cis-L 2 , but used different metal salt in the four coordination polymer ligand be adjusted accordingly depending on the metal ion in the complexes 3,4,5 taken bidentate corresponding ligand molecule between the pyridine ring the dihedral angle is different, take 6 tetradentate ligand. (4) The ligand L 3 and the ligand L 4 to each other isomers, in the complexes are taken trans-configuration, close to the linear shape. When the ligand L 3 with the role of the different metal complexes are formed, can change the angle between the both ends of the pyridine ring and the pyridine ring, and the intermediate between benzene and thus ligand configuration changes , and the network structure of an impact. (5) The complexes 9 the structure and known results, i.e., obtained by a non-symmetric ligand complexes easily formed without

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