Novel Cobalt(II) Coordination Polymers Constructed from 3,3鈥?4,4鈥?Oxydiphthalic Acid and N-Donor Ligands: Syntheses, Crystal Structures, and Magnetic Properties

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• 作者：Qian Chu ; Zhi Su ; Jian Fan ; Taka-aki Okamura ; Gao-Chao Lv ; Guang-Xiang Liu ; Wei-Yin Sun ; Norikazu Ueyama
• 刊名：Crystal Growth & Design
• 出版年：2011
• 出版时间：September 7, 2011
• 年：2011
• 卷：11
• 期：9
• 页码：3885-3894
• 全文大小：1268K
• 年卷期：v.11,no.9(September 7, 2011)
• ISSN：1528-7505

文摘

Four novel cobalt(II) coordination polymers [Co₂(OA)(dib)₂(H₂O)] (1), [Co₂(OA)(bbi)₂]路3H₂O (2), [Co₃(HOA)₂(bpe)₂(H₂O)₆]路2H₂O (3), and [Co₂(OA)(dpe)(H₂O)₂] (4) were obtained by hydrothermal reactions of Co(NO₃)₂路6H₂O with 3,3鈥?4,4鈥?oxidiphthalic acid (H₄OA) and corresponding N-donor ligands, namely, 1,4-di(1-imidazolyl)benzene (dib), 1,1鈥?(1,4-butanediyl)bis(imidazole) (bbi), 1,2-bis(4-pyridyl)ethane (bpe), and 1,2-di(4-pyridyl)ethylene (dpe), respectively. Single crystal X-ray diffraction analysis revealed that 1 is a two-dimensional (2D) network containing infinite -(Co鈥揙鈥揅鈥揙)_n- chains, while 2 features a 2D double-layered structure with two types of homochiral helical chains filled in the cavities. Complex 3 is a three-dimensional (3D) framework with (6⁴.8²)(6⁶) topology containing infinite 2D networks pillared by bpe bridging ligands. 4 is a (4⁴.6⁶) topological 3D framework with coordinated dpe molecules occupied in the channels. The results revealed that the flexible multi-carboxylate and N-donor auxiliary ligands are effective building blocks in constructing coordination polymers with diverse architectures. In addition, the magnetic properties of 1, 3, and 4 were investigated, and the results showed that weak ferromagnetic interactions occurred between Co(II) ions in 1 and 3, while 4 displays a weak antiferromagnetic behavior.