basis of the ion species. The spectral intensity in nonaromatic cation based ILs was much lower than that in aromatic cation based ILs owing to the absence of the aromatic ring, i.e., the libration of the aromatic species had a strong spectral intensity in the low-frequency region. However, nonaromatic cation based ILs with a flat anion, such as dicyanamide and tricyanomethide, showed stronger spectral
在此,报道了通过飞秒拉曼诱导的克尔效应光谱法测量的在293 K下的四十个非芳香族阳离子型离子液体(ILs)的分子间振动数据。通过傅立叶变换反卷积分析获得了0.3–700 cm -1频率范围内的低频频谱。低于〜200 cm -1的低频频谱的线形根据离子种类进行了讨论。由于不存在芳环,因此基于非芳族阳离子的ILs的光谱强度比基于芳族阳离子的ILs的光谱强度低得多,即芳族物质的释放在低频区域具有很强的光谱强度。但是,由于阴离子的释放,具有平面阴离子的非芳香族阳离子基离子分子(如双氰胺和三氰甲基甲烷)显示出更强的光谱强度。在离子物种结构的背景下,还讨论了其他独特的光谱特征。还估计了液体性质,例如密度,粘度,电导率和表面张力。在比较低频光谱和非芳香族阳离子基离子液体的整体液体性质时,
Cucurbit[7]uril host–guest complexes and [2]pseudorotaxanes with N-methylpiperidinium, N-methylpyrrolidinium, and N-methylmorpholinium cations in aqueous solution
作者:Mona A. Gamal-Eldin、Donal H. Macartney
DOI:10.1039/c2ob27282b
日期:——
1 : 1 ([2]pseudorotaxanes) and 2 : 1 host–guestcomplexes with cucurbit[7]uril. The cucurbituril initially resides over the decamethylene chain, however with further additions of the host molecule a translocation of the hosts to the cationic N-heterocyclic head groups occurs. The order of the magnitude of the cucurbituril host–gueststability constants, determined by competitive 1H NMR binding experiments
使用1 H NMR光谱和电喷雾电离质谱法研究了葫芦[7]尿素与一系列N-取代的N-甲基哌啶鎓,N-甲基吡咯烷鎓和N-甲基吗啉鎓阳离子之间的主-客体络合物的形成。由十甲基链桥接的包含N-甲基杂环首基的阳离子与葫芦丝[7]尿嘧啶形成顺序的1:1([2]假轮烷)和2:1主体-客体复合物。葫芦素起初位于十甲基链上,但是随着主体分子的进一步添加,主体易位至阳离子N-发生杂环首基。通过竞争性1 H NMR结合实验确定的葫芦素主体-客体稳定性常数的大小顺序遵循季铵阳离子疏水性的趋势。
Manganese Acetate in Pyrrolidinium Ionic Liquid as a Robust and Efficient Catalytic System for Epoxidation of Aliphatic Terminal Alkenes
作者:Kam-Piu Ho、Wing-Leung Wong、Lawrence Yoon Suk Lee、Kin-Ming Lam、Tak Hang Chan、Kwok-Yin Wong
DOI:10.1002/asia.201000109
日期:2010.9.3
Green epoxides! A novel and simple ionic liquid/manganese acetate catalytic system has been developed for the rapid and selective oxidation of aliphatic terminal alkenes to epoxides. It provides an efficient, reusable, and scalable protocol for the green synthesis of epoxides from various aliphatic terminal alkenes.
New family of highly conductive and low viscous ionic liquids with asymmetric 2,2,2-trifluoromethylsulfonyl-N-cyanoamide anion
作者:Alexander S. Shaplov、Elena I. Lozinskaya、Petr S. Vlasov、Sofia M. Morozova、Dmitrii Y. Antonov、Pierre-Henri Aubert、Michel Armand、Yakov S. Vygodskii
DOI:10.1016/j.electacta.2015.02.228
日期:2015.9
The synthetic pathway for the preparation of potassium salt with novel asymmetric 2,2,2-trifluoromethylsulfonyl-N-cyanoamide (TFSAM, CF3SO2-N-CN) anion in high yield and purity is reported. New family of ionic liquids, based on “classical” 1-methyl-3-alkylimidazolium, N-methyl-N-propylpyrrolidinium, quaternaryammonium or phosphonium non-cyclic cations with TFSAM as counter-anion, were synthesized
electrochemical energy‐storage devices is one of the most appealing and emerging options. However, although ILs are hailed as safer and eco‐friendly electrolytes, to overcome the limitations imposed by the highly volatile/combustible carbonate‐based electrolytes, full‐scale and precise appraisal of their overall safety levels under abuse conditions still needs to be fully addressed. With the aim of providing