离子液体(IL)作为高度可调的多功能材料正受到越来越多的关注。对于液体而言,它们通常表现出高水平的结构顺序。这种结构顺序甚至可能导致中间相的形成,例如液晶(LC)。咪唑鎓化合物是迄今为止最受欢迎的IL,因为它们为性能调节提供了广泛的平台。为了研究基于咪唑鎓的离子键的驱动结构顺序,是一系列不对称的1-十二烷基-2-甲基-3-烷基咪唑鎓溴化物,[C 12 C 1 C n im] [Br],n已合成= 0-12,对其进行了全面表征,并与类似的1-十二烷基-3-烷基咪唑鎓以及1,2,3-三唑鎓溴化物相比,它们的结构和性质。目的是研究通过甲基化取代最酸性的2-H质子对咪唑鎓头部的影响,对IL的性质和结构产生影响。对于所有化合物,除了具有丁基和己基链的化合物以及质子化物质以外,都可以观察到中间相的形成。显然,仅存在长烷基链如十二烷基(文献中经常提出的设计概念)不足以单独支持中间相的形成。而是,为了形成
Antibacterial activities of imidazolium, pyrrolidinium and piperidinium salts
作者:Noritaka Iwai、Kyosuke Nakayama、Tomoya Kitazume
DOI:10.1016/j.bmcl.2011.01.081
日期:2011.3
The antibacterialactivity of various types of imidazolium, pyrrolidinium and piperidinium salts with both propargyl group and alkyl and/or silylalkyl chains of different lengths, are described. Especially, the MIC (μg/ml) of prepared each compound for Escherichia coli and other several bacteria was determined.
Protoporphyrin IX derivatives having two alkylphosphocholine groups (lipidâporphyrins) forms stable fibrous aggregates in aqueous medium; fibres have been spontaneously incorporated into the bilayer of the phospholipid vesicle.
New imidazole compounds were synthesized to develop a novel and effective antibacterial agent (1-benzyl-3-cetyl-2-methylimidazolium iodide, NH125). In vitro experiments demonstrated that NH125 effectively inhibited a number of different histidine protein kinases. Furthermore, oxacillin-resistant Staphylococcus aureus (ORSA), vancomycin-resistant Enterococcus faecalis (VRE), penicillin-resistant Streptococcus pneumoniae (PRS), and other Gram-positive and Gram-negative bacteria were found to be very sensitive to NH125.
作者:Alexandra Alvarez Fernandez、Marcel J. A. van Dongen、Daniel Blanco-Ania、Paul H. J. Kouwer
DOI:10.1039/c4ra04884a
日期:——
available synthetic routes, however, contain strong disadvantages which may have caused the underexposure of this class of ionicliquids. In this manuscript, we provide a novel facile route to ionicliquid crystals with different hydrophilic anions, yielding pure materials as a result of our very mild reaction conditions. Our generic approach may be used to prepare conventional ionicliquids, but also
Imidazolium-functionalized β-cyclodextrin as a highly recyclable multifunctional ligand in water
作者:Vanessa Kairouz、Andreea R. Schmitzer
DOI:10.1039/c4gc00365a
日期:——
We describe here the synthesis and the catalytic properties of a novel dodecyl-imidazolium modified β-cyclodextrin as a self-assembled catalytic system (Fig. 1) in neat water for an effective SuzukiâMiyaura reaction. The introduction of the dodecyl-imidazolium motif on the primary face of the β-cyclodextrin allowed the development of a green highly recyclable catalytic system for reactions in an aqueous environment. We present the application of this system to the SuzukiâMiyaura coupling without the use of a co-solvent or stabilizing phosphine ligands in aqueous media. The catalytic system is highly recyclable, allowing the reuse of the palladium catalyst in subsequent catalytic runs without loss of activity.