Structural and Spectroscopic Characterizations of Amide–AlCl3-Based Ionic Liquid Analogues

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• 作者：Pengcheng Hu ; Rui Zhang ; Xianghai Meng ; Haiyan Liu ; Chunming Xu ; Zhichang Liu
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：March 7, 2016
• 年：2016
• 卷：55
• 期：5
• 页码：2374-2380
• 全文大小：429K
• ISSN：1520-510X

文摘

Several amide–AlCl₃-based ionic liquid (IL) analogues were synthesized through a one-step method using three different structure amides as donor molecules. The effects of the steric and inductive effects of the methyl group substituted on the N atom on the asymmetric splitting of AlCl₃ and the coordination site of the amide were investigated by ²⁷Al NMR, Raman, in situ IR, and UV–vis spectra for these IL analogues. Bidentate coordination through both the O and N atoms was dominant in the N-methylacetamide–AlCl₃- and N,N-dimethylacetamide–AlCl₃-based IL analogues because of the inductive effect of the methyl group. By contrast, the acetamide–AlCl₃-based IL analogue presented mainly in the form of monodentate coordination via the O atom. Compared with monodentate coordination, bidentate coordination was favorable to the asymmetric splitting of AlCl₃ with the same amide–AlCl₃ molar ratio. Under the influence of the steric and inductive effects of the methyl group, the ionic species percentages in these IL analogues ranked in the following order: N-methylacetamide > N,N-dimethylacetamide > acetamide.