[EN] FLUORINE-BASED IONIC LIQUID AND PRODUCTION METHOD THEREOF [FR] LIQUIDE IONIQUE À BASE DE FLUOR ET SON PROCÉDÉ DE PRODUCTION [JA] フッ素系イオン性液体およびその製造方法
An Efficient Conversion of Alcohols to Alkyl Bromides Using Pyridinium Based Ionic Liquids: A Green Alternative to Appel Reaction
作者:Pranab J. Das、Jupitara Das、Dimpee Das
DOI:10.14233/ajchem.2018.21086
日期:——
procedures suffer from the use of toxic and expensive reagents and further the use of triphenylphosphine makes product recovery difficult and time consuming specially due to the in situ formation of the phosphane oxide. In order to avoid the use of triphenylphosphine, an elegant phosphine free halogenation protocol using a visible light photoredox catalyst Ru(bpy)3Cl2 was reported [9]. An Efficient Conversion
γ‐picoline with appropriate alkylbromide and further condensation with substituted benzaldehyde. Compounds with long N‐alkyl chains (C18H37–C20H41) had no antifungal activity against the cells of all tested C. albicans strains. Other styrylpyridinium compounds were able to inhibit yeast growth at the concentrations of 0.06–16 μg/ml. At fungicidal concentrations, the compound with the CN‐ group was least
为了评估对白色念珠菌细胞的抗真菌活性,我们合成了一组 13 种新的和较早描述的苯乙烯基吡啶鎓化合物(N-烷基苯乙烯基吡啶鎓盐与溴化物或甲苯磺酸盐),以评估与氟康唑可能的协同作用,并评估对哺乳动物的细胞毒性。细胞。所有化合物都是根据众所周知的两步程序合成的,包括用适当的烷基溴对 γ-甲基吡啶进行烷基化,然后与取代的苯甲醛进一步缩合。具有长N-烷基链( C 18 H 37 –C 20 H 41 ) 的化合物对所有测试的细胞均无抗真菌活性白色念珠菌菌株。其他苯乙烯基吡啶化合物能够在 0.06–16 μg/ml 的浓度下抑制酵母生长。在杀真菌浓度下,带有 CN- 基团的化合物对哺乳动物细胞的毒性最小,与氟康唑的协同作用最有效,对白色念珠菌的呼吸作用仅有轻微抑制。具有 4'-二乙氨基的化合物表现出最强的杀菌特性,并有效地阻断了白色念珠菌细胞的呼吸作用。然而,对哺乳动物细胞的毒性也很高。总而言之,我们
Dye–Surfactant Interaction: Role of an Alkyl Chain in the Localization of Styrylpyridinium Dyes in a Hydrophobic Force Field of a Cationic Surfactant (CTAB)
作者:Amaresh Mishra、Sanjukta Patel、Rajani K. Behera、Bijaya K. Mishra、Gopa B. Behera
DOI:10.1246/bcsj.70.2913
日期:1997.12
The interaction of a number of cationic dyes (I) with a varying number of methylene groups (Cn) in the alkyl chain attached to pyridyl nitrogen with a cationic surfactant (CTAB) assembly is reported. The binding constant of the dyes (C5 to C18) with the micelle have been calculated, and are found to increase with increasing carbon chain. A plot of the binding constant vs. the chain length shows a curve with a maximum for C16, which is attributed to a compatibility factor. From studies of the electronic and emission spectra it is proposed that a micelle has a hydrophobic force field and that the dyes are localized in various pockets of the field.
Heparin triggered dose dependent multi-color emission switching in water: a convenient protocol for heparinase I estimation in real-life biological fluids
作者:Nilanjan Dey、Suman K. Samanta、Santanu Bhattacharya
DOI:10.1039/c6cc08657h
日期:——
The reversible self-assembly of amphiphilic probes with heparin as the stimulus for the screening of heparinase I enzyme is reported.
报道了以肝素为刺激物的两性探针可逆自组装,用于筛选肝素酶I酶。
Aggregation induced emission switching and electrical properties of chain length dependent π-gels derived from phenylenedivinylene bis-pyridinium salts in alcohol–water mixtures
作者:Suman K. Samanta、Santanu Bhattacharya
DOI:10.1039/c2jm35012b
日期:——
Supramolecular Ï-gels were formed in a mixture of aliphatic alcohols and water for a series of chromophoric phenylenedivinylene bis-N-alkyl pyridinium salts (PPV) appended with terminal aliphatic hydrocarbon chains of different lengths. Gelation could be controlled either by altering the ratio of various alcoholâwater mixtures or by changing the aliphatic chain length of the gelator. The temperature- and the ratio-variation in the ethanolâwater mixtures exhibited a tunable emission behavior depending on the extent of aggregation which was promoted by aromatic Ï-stacking, van der Waals and electrostatic interactions among the individual PPV units. Thus, a light-blue emission at higher temperature (>40 °C), a reddish-orange emission at low temperature (<20 °C) and a white-light emission at room temperature (25â30 °C) were observed in solution. The gelators possessing longer aliphatic chains exhibited a higher gel-melting temperature, increased viscoelasticity and shorter fiber diameter based on a delicate hydrophobic/hydrophilic balance. A semiconducting nature of the electrical conductivity was observed for the individual compounds and the magnitude of the current increased with increasing width of the gel fibers upon decreasing the aliphatic chain length. A reversible one-electron redox behavior was observed for the chromophore and the redox potential decreased with the increase in the chain length. A diffusion-controlled redox behavior was observed for the gelators with shorter aliphatic chains. However, the compounds with longer chains made the process diffusion-limited.