Abstract
Two one-dimesional (1D) coordination polymers (CPs) [Cu2(μ 2-OAc)4(μ 2-bpt)] n (1) and [Cu(μ t-DMF)(μ t-NO3)2(μ 2-bpmh)] n (2) (DMF = N,N-dimethylformamide) based on copper(II) salts and 3,5-bis(4-pyridyl)-1,2,4-triazole (bpt) and 1,2-bis(pyridin-4-ylmethylene)hydrazine (bpmh) have been synthesized under different conditions, respectively; and characterized by single-crystal X-ray diffraction, elemental analysis, thermogravimetric analyses, powder X-ray diffraction, fluorescence analysis, fourier transforming infrared and ultraviolet–visible spectroscopies. CP 1 shows an infinite 1D zigzag chain with paddle-wheel shaped [Cu2(μ 2-OAc)4] secondary building units (SBUs) and μ 2-bpt V-shaped dipyridyl ligands. The Cu···Cu distance in the [Cu2(μ 2-OAc)4] core is 2.631(18) Å, supporting the Cu···Cu interaction. Cu(II) in CP 2 also adopts five-coordinated mode but in trigonal bipyramidal geometry which is completed by three O atoms from nitrates and DMF and also two N atoms from adjacent bpmh to form an infinite 1D linear chain. Furthermore, the magnetism property of CP 1 was investigated. Its results show that CP 1 indicated antiferromagnetic behavior. In addition, CPs 1 and 2 display fluorescence quenching compared with corresponding free ligands at room temperature.
Graphical Abstract
CPs 1 and 2 were hydrothermally synthesized and solution interdiffusion procedure, respectively. Both of which show 1D infinite zigzag chain but pack in different patterns. CP 1 shows an infinite 1D zigzag chain with paddle-wheel shaped [Cu2(μ 2-OAc)4] secondary building units (SBUs) and μ 2-bpt V-shaped dipyridyl ligands. Cu(II) in CP 2 also adopts five-coordinated mode but in trigonal bipyramidal geometry which is completed by three O atoms from nitrates and DMF and also two N atoms from adjacent bpmh to form an infinite 1D linear chain. CP 1 shows antiferromagnetic behavior. Both CPs 1 and 2 display fluorescence quenching compared with corresponding free ligands at room temperature.
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Acknowledgments
Financial support from the National Natural Science Foundation of China (51432006, 50925207 and 51172100), the Ministry of Science and Technology of China for the International Science Linkages Program (2009DFA50620 and 2011DFG52970), the Ministry of Education of China for the Changjiang Innovation Research Team (IRT1064), the Ministry of Education and the State Administration of Foreign Experts Affairs for the 111 Project (B13025), and Jiangsu Innovation Research Team are gratefully acknowledged.
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Zhao, H., Zhang, C. Syntheses, Structures, Magnetism and Fluorescence Studies of Two 1D Cu(II) Coordination Polymers Based on Bipyridyl Ligands. J Inorg Organomet Polym 25, 912–920 (2015). https://doi.org/10.1007/s10904-015-0188-3
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DOI: https://doi.org/10.1007/s10904-015-0188-3