pH-dependent self-assembly of copper(II) complexes with a new imidazole-containing polyamine ligand: Synthesis,structure and magnetic property |
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| Authors: | Zhao-Peng Qi Zheng-Shuai Bai Qing Yuan Taka-aki Okamura Kai Cai Zhi Su Wei-Yin Sun Norikazu Ueyama |
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| Affiliation: | 1. Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China;2. Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan |
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| Abstract: | Four copper(II) complexes were synthesized by reactions of new imidazole-containing polyamine ligand N1-(2-aminoethyl)-N1-(1H-imidazol-4-ylmethyl)-ethane-1,2-diamine (HL) with Cu(ClO4)2 · 6H2O under different pH and their structures were characterized by X-ray crystallography. Interestingly, the complexes have diverse structures from protonated ligand [H3(HL)][CuCl4] · Cl (1), dinuclear [Cu2(HL)2Cl](ClO4)3 · H2O (2), one-dimensional chain polynuclear {[Cu(L)](ClO4)}n (3) to cyclic-tetranuclear [Cu4(L)4](ClO4)4 · 3CH3CN (4) coordination compounds by varying reaction pH from acidic to basic. The results indicate that the reaction pH has great impact on the formation and structure of the complexes. The magnetic measurements show that there are antiferromagnetic interactions between the Cu(II) centers with g = 2.09, J = −39.0 cm−1 and g = 2.17, J = −36.8 cm−1 for 3 and 4, respectively. |
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| Keywords: | Imidazole-containing ligand Copper(II) pH-dependent Magnetic property |
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