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Syntheses and Magnetic Properties of Transitionmetal Coordination

Author: XingHuanRan
Tutor: LiXinHua
School: Wenzhou University
Course: Organic Chemistry
Keywords: Coordination polymers Crystal structure Magnetic Properties
CLC: O641.4
Type: Master's thesis
Year: 2008
Downloads: 48
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Abstract


With the development of coordination chemistry , coordination polymer structure and magnetic properties by the people 's attention. In order to synthesize the new structure , revealing new magnetic phenomena , magnetism and molecular system to explore the relationship between structure , this thesis several different organic compounds containing a pyridine ring ( 4,4 ??' - even pyridine (bpy), 1,3 - bis (4 - pyridyl ) propane (bpp), 1,10 - phenanthroline (phen)) , and several different acids ( both tribenzoate (TMA), nicotinic acid (nic), 5 - nitro- isophthalic acid (NIP), 4,4 '- oxybis ( benzoic acid ) (H2oba)) as a ligand to build five transition metal organic complexes , analytical determination of the crystal structure , focusing on the magnetism of such complexes performance and structure of the relationship , and IR, elemental analysis , powder diffraction preliminary study . The five structures of the formula : [Co (TMA) 3 (bpy) 2] n 1, [Ni (NIP) (bpp) (H2O)] n 2, [Mn (oba) (phen) (H2O)] n3 , [Ni2 (nic) 4 (H2O)] n4 and [Ni2 (nic) 2 - (H2O) 4] 5. Crystal structure analysis showed that the complexes 1 and 3 are one-dimensional linear structure ; Complex 2 is a three-dimensional network structure. Magnetic analysis showed that 1 and 2 are present in antiferromagnetic coupling interaction , and the existence of complex 3 ferromagnetic coupling . Complex 4 and 5 are two complexes can be converted cyclic structure, and can be controlled by adjusting the reaction conditions the conversion rate between the two substances . Complex 4 which is a channel having a mushroom -shaped structure, and the metal ions in the coupling between the ferromagnetic ; Complex 5 is a zero- dimensional structure in the metal ions exist between the anti- ferromagnetic coupling .

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Structural Chemistry > Complex chemistry ( coordination chemistry )
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