Studies on the magnetic properties of two cobalt(II) complexes bearing 1,4-phenylenediacetate ligands |
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| Authors: | Zi-Lu Chen Wei Xiong Zhong Zhang Fu-Pei Liang Bing-Chang Luo |
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| Institution: | (1) Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Chemical Engineering of Guangxi Normal University, 541004 Guilin, People’s Republic of China |
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| Abstract: | One reported compound Co(PDA)(4,4′-bipy)]n·nH2O and one new compound Co(PDA)(Im)2(H2O)2]n·nH2O were prepared by the reactions of Co(NO3)2·6H2O or Co(OH)2 with 1,4-phenylenediacetic acid (H2PDA) in the presence of the ancillary ligands 4,4′-bipyridine (4,4′-bipy) or imidazole (Im), and their magnetic properties
were investigated. The presence of 4,4′-bipy in Co(PDA)(4,4′-bipy)]n·nH2O results in a μ
3-bridging mode of the PDA2− ligand with one μ
2-carboxylato group and one chelating carboxylato group and the construction of a 2D framework as reported in the literature.
The introduction of Im ligand in Co(PDA)(Im)2(H2O)2]n·nH2O helps to construct a one dimensional chain with the two carboxylato groups of PDA2− ligand in monodentate coordination modes. The magnetic studies reveal the presence of dominant antiferromagnetic interaction
in Co(PDA)(4,4′-bipy)]n·nH2O with a field-induced magnetic transition due to spin-flop. Magnetically, Co(PDA)(Im)2(H2O)2]n·nH2O presents a mononuclear structure. This work reveals that the introduction of ancillary ligands in the Co(II)-PDA system
adjusts the linking modes of PDA2− and therefore the resulting frameworks and their magnetic properties. |
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