Preparation,crystal structures and magnetic properties of hetero- and homo-metallic coordination polymers with triazacyclononane derivatives bearing propionic acid pendant arms |
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| Authors: | Qin Wei Qi Tang Yan-Fang Feng Zhong Zhang Yong-Zhi Liao |
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| Institution: | 1.School of Chemistry and Pharmacy of Guangxi Normal University,Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China),Guilin,People’s Republic of China;2.Guangxi Academy of Fishery Sciences,Nanning,People’s Republic of China |
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| Abstract: | Two Cu(II)–Na(I) hetero-metallic coordination polymers Cu2Na5(tacntp)2(H2O)9](ClO4)3·2H2O (1) and Cu2Na5(tacntp)2(H2O)9](ClO4)3·2H2O (2) were constructed from Cu(II) salts and a trisubstituted N-propionic acid functionalized ligand, namely 1,4,7-triazacyclononane-1,4,7-tripropionic acid (tacntpH3). In complex 1, the Na+ ions act as nodes, being surrounded by six Cu(tacntp)]? moieties resulting in a 2D coordination polymer. In complex 2, Na+ ions are bridged by pendant carboxylate groups and water ligands to give a 1D Na–O inorganic polymeric ribbon, which is expanded into a complicated 2D hetero-metallic array through the connecting Cu(tacntp)]? units. The differences between the two structures are related to the amount of Na+ ions present in the reaction media. In further experiments, the trisubstituted pro-ligand tacntpH3 underwent a hydrothermal Cu(II)-induced cleavage of one of three pendant arms, and the resultant disubstituted pro-ligand tacndpH2 assembled with Cu(II) to give a 1D homo-metallic zigzag chain compound Cu(tacndp)]ClO4·H2O (3). Magnetic susceptibility measurements on complex 3 revealed a ferromagnetic interaction between the Cu(II) centers within the 1D chain. |
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