INOR 893 |
| Various macrocyclic and non-cyclic polyamine ligands have been synthesized in the past decades, and their reactions with varied metal salts have been carried out. However, polyamine ligand with imidazole group is not well studied to now. We designed and prepared a new tripodal polyamine ligand with imidazole group, namely N1-(2-aminoethyl)-N1-(2-imidazol-1-ylethyl)-ethane-1,2-diamine (L), and reactions of L with Zn(II), Cu(II), Cd(II) salts were investigated. It is interesting to find that when ligand L reacted with M(II) (M = Cu, Zn, Cd) perchlorate at pH 9, complexes [M3(L)3(µ3-CO3)](ClO4)4•nCH3CN (1, M = Cu, n = 3; 2, M = Zn, n = 1; 3, M = Cd, n = 2) with 2D network structure were formed with the aid of CO32- anions which come from the absorption and hydration of the atmospheric carbon dioxide. However, when the reactions were performed at pH 7, dinuclear Zn(II) complex [Zn(L)(H2O)]2(ClO4)4•4H2O (4), and complexes [Cd(L)Cl]ClO4•H2O (5), [Cu(L)(H2O)](ClO4)2 (6) with 1D chain structure were obtained. In addition, when Cu(NO3)2 was used to react with L at pH 9, an unique 1D double-stranded helical chain complex [Cu(L)Cl]NO3•1.25H2O (7) was obtained. The results revealed that the reaction pH and the counter anion have great impact on the carbon dioxide absorption and hydration as well as on the assembling and structure of the complexes. |
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General Inorganic Chemistry
1:30 PM-5:20 PM, Wednesday, August 22, 2007 BCEC -- 212, Oral
Division of Inorganic Chemistry |