A Family of Fe(II)/Cl Supramolecular Coordination Systems Incorporating 5,5鈥?Di(pyridin-2-yl)-3,3鈥?bi(1,2,4-triazole)

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• 作者：Peng-Fei Yao ; Ye Tao ; Hai-Ye Li ; Xiao-Huan Qin ; Dong-Wei Shi ; Fu-Ping Huang ; Qing Yu ; Xing-Xing Qin ; He-Dong Bian
• 刊名：Crystal Growth & Design
• 出版年：2015
• 出版时间：September 2, 2015
• 年：2015
• 卷：15
• 期：9
• 页码：4394-4405
• 全文大小：797K
• ISSN：1528-7505

文摘

By using a new N-heterocyclic building block, 5,5鈥?di(pyridin-2-yl)-3,3鈥?bi(1,2,4-triazole) (2,2鈥?H₂dbpt), five novel coordination complexes, Fe₄(2,2鈥?Hdbpt)₂Cl₆(H₂O)₆ (1), [Fe(2,2鈥?H₂dbpt)Cl₂路H₂O]_n (2), [Fe(2,2鈥?H₂dbpt)Cl₂]_n (3), [Fe₂(2,2鈥?H₂dbpt)Cl₄]_n (4), and [Fe(2,2鈥?H₂dbpt)_0.5Cl₂]_n (5), based on a Fe(II)/Cl system with diversiform connectivity from zero- to two-dimensional (2D) were constructed successfully. By regulating the metal鈥搇igand ratio and solvents, 2,2鈥?H₂dbpt changed various coordination modes. Consequently, 1 reveals a discrete Fe₄(2,2鈥?Hdbpt)₂Cl₆(H₂O)₆ supramolecule. 2 and 3 are pseudo-polymorphic. 2 reveals a helical chain based on the cis-FeCl₂N₄ unit and the cis-bridging 2,2鈥?H₂dbpt ligand, while 3 reveals a straight-chain based on the trans-FeCl₂N₄ unit and the trans-bridging 2,2鈥?H₂dbpt ligand. 4 and 5 are also supramolecular isomers. Different from 2 and 3, both of them have a cis-FeCl₂N₄ unit. Owing to the different rotation angles of pyridine rings in 2,2鈥?H₂dbpt, 4 and 5 reveal a one-dimensional modified trapezoid chain based on the trans-bridging 2,2鈥?H₂dbpt ligand and a 2D wave-like layer based on the cis-bridging 2,2鈥?H₂dbpt ligand, respectively. Furthermore, compound 4 could also be viewed as a wave banded chain constructed by 3 with 渭₂-Cl ions replaced by the terminal Cl ions and water molecules from another perspective. 1 reveals weak antiferromagnetic behavior. 2, and 3 both reveal paramagnetic behavior, while 4 and 5 both reveal ferromagnetic behavior. These results indicate that 2,2鈥?H₂dbpt is an excellent multi-connection linker to construct supramolecular coordination complexes with interesting structures and properties.