期刊
INORGANIC CHEMISTRY COMMUNICATIONS
卷 66, 期 -, 页码 41-46出版社
ELSEVIER
DOI: 10.1016/j.inoche.2016.01.002
关键词
Substituted imidazole-dicarboxylate; Single X-ray analysis; Trinuclear cluster; Antiferromagnetic exchange; Spin-canting
资金
- National Natural Science Foundation of China [21271098, 21273101]
- Tackle Key Problem of Science and Technology Project of Henan Province, China [142102310483]
- Foundation for Science AMP
- Technology Innovation Talents of Henan Province [2014HASTIT014, 161341005100112]
- Program for Ministry of Science and Technology of China (973 Project) [2014CB660804]
Two three dimensional (3D) Co(II) coordination polymers incorporating similar substituted imidazole-dicarboxylate and dipyridyl-type ancillary ligands pillared layer, namely, {Co-3(mimda(3-))(2) (bpe)(3)center dot 3H(2)O}(n) (1) and {Co-3 (eimda(3-))(2)(biPY)(3)center dot 8H(2)O}(n) (2) (H(3)mimda = 1H-2-methyl-4,5-imidazole-dicarboxylic acid, while H(3)eimda = 1H-2-ethyl-4,5-imidazole-dicarboxylic acid, bpe = 1,2-di(4-pyridyl) ethylene and bipy = 4, 4'-bipyridine) have been successfully synthesized. Both polymers 1 and 2 have been characterized by elemental analysis, IR spectroscopy, single-crystal X-ray diffraction, and thermogravimetric analysis (TGA). X-ray structural analysis reveals that they are nearly isostructural, possessing similar symmetry units based on trinuclear clusters, and further is propagated into a Kagome-like lattice. The lattice consists of corner-sharing triangles of spins with magnetic coupling between the nearest neighboring Co(II) ions. Magnetic measurements revealed spin-canting-like antiferromagnetism behaviors for compounds 1 and 2 at lower temperature. The interaction in 1 is slightly stronger than that of 2, which can be explained by the discrepancy of organic linker between the adjacent Co(II) centers. (C) 2016 Elsevier B.V. All rights reserved.
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