Structural and Magnetic Diversity Based on Different Imidazolate Linkers in Cu(II)-Azido Coordination Compounds

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• 作者：Anindita Chakraborty ; Srinivasa Rao Lingampalli ; Aman Kumari ; Joan Ribas ; Jordi Ribas-Arino ; Tapas Kumar Maji
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：November 17, 2014
• 年：2014
• 卷：53
• 期：22
• 页码：11991-12001
• 全文大小：723K
• ISSN：1520-510X

文摘

This Article reports the syntheses, structural characterization, and magnetic studies of four different Cu(II)-azido compounds based on imidazole or substituted imidazole ligand. The compounds, [Cu₂(渭_1,1-N₃)₂(EtimiH)₄(ClO₄)₂] (1) (EtimiH = 2-ethylimidazole), [Cu₂(渭-Meimi^{鈥?/sup>)(MeimiH)₂(渭_1,1-N₃)₂(渭_1,3-N₃)]_n (2) (MeimiH = 2-methylimidazole; 渭-Meimi鈥?/sup> is the bridging mononegative anion of 2-methylimidazole), [Cu₂(渭-imi鈥?/sup>)(imiH)₂(渭_1,1-N₃)₂(渭_1,3-N₃)]_n (3), and [{Cu₂(渭_1,1-N₃)₂(渭_1,3-N₃)(渭-imi鈥?/sup>)(imiH)₃}路H₂O]_n (4) (imiH = imidazole; 渭-imi鈥?/sup> = bridging mononegative anion of imidazole), have been synthesized by the self-assembly of Cu(II) salts, azide ion, and the corresponding imidazole bridging ligands. By changing the substitution on the second linker (imidazole or substituted imidazole) and varying synthetic conditions, diverse structural and magnetic features have been achieved in compounds 1鈥?b>4. Compound 1 has a double end-on azido bridged dinuclear core, while the other compounds (2鈥?b>4) have 2D networks. Compound 2 and 3 contain 1D chains with alternate 渭_1,1-N₃ and 渭-Meimi鈥?/sup> bridging, and such chains are further connected through a 渭_1,3-N₃ bridge to result in the formation of the 2D network. Compound 4 is a novel 2D coordination polymer consisting of a zigzag 1D coordination chain having (渭_1,1-N₃)₂, 渭-imi鈥?/sup>, and (渭_1,3-N₃)₂ bridging groups and the chains undergo bridging through a 渭_1,3-N₃ group resulting in the 2D network. Temperature dependent magnetic measurements show diverse magnetic properties of 1鈥?b>4. Such versatile magnetic behaviors have been correlated to the respective bridging mode of azide and the corresponding imidazole bridging ligands.}