19768-54-8Relevant articles and documents
On the effects of head-group volume on the adsorption and aggregation of 1-(n-hexadecyl)-3-Cm-imidazolium bromide and chloride surfactants in aqueous solutions
Keppeler, Nicolas,Galgano, Paula D.,da Silva Santos, Soraya,Malek, Naved I.,El Seoud, Omar A.
, (2021)
The effects of the length of alkyl side chain (Cm) of ionic liquid-based surfactants (ILBSs) on their adsorption at the water/air interface, and aggregation in aqueous solutions were investigated for the series 1-(n-hexadecyl)-3-Cm-imidazolium bromides and chlorides, where Cm = C1-C4 for the bromides, and C1-C5 for the chlorides. These physicochemical properties were calculated from surface tension, conductivity, and fluorescence data. It was found that increasing the length of Cm (i.e., volume of the head group) leads to enhancement of surface activity, increase in the area per surfactant molecule at the water/air interface (Amin) and the degree of counter-ion dissociation (αmic). Our data also indicated that increasing the volume of the head group results in a decrease of the critical micelle concentration (cmc), Gibb's free energy of adsorption and micellization, and microscopic polarity of interfacial water. In order to delineate the effects of the presence of unsaturation in the HG, we included members that carry Cm = vinyl and allyl in the bromide series. The effect of these groups was found to be similar to removing a methylene group from Cm. The dependence of the solubilization of a lipophilic dye (Sudan IV) and a drug (nitrendipine) on the length of Cm was also studied.
Synthese et proprietes antibacteriennes et antifongiques d'une serie de 1-alkylimidazoles
Savignac, A. de,Roques, C.,Hinedi, M.,Michel, G.,Lattes, A.
, p. 449 - 454 (1990)
A homologous series of 1-alkylimidazoles (pentyl to octadecyl) has been obtained with a good yield (75-95percent) by the phase transfer catalyzed reaction of imidazole with the appropriate alkyl halides.The antifungal and antibacterial activities of these compounds were tested.A poor activity was observed towards the Gram-negative (Gram-) microorganisms, whereas the aerobic and anaerobic Gram-positive (Gram+) microorganisms and some yeasts (Pityrosporum ovale) were inhibited.We found that the inhibitory potency of such compounds increased with increasing chain length,passing through a maximum with chain length C10-C13 and decreased for the higher homologs.An explanation is suggested in relation to the ability of these compounds to bind with the active sites of the microorganisms and to adopt a conformation able to promote the migration through the biological membranes.
Iron(II) spin-crossover complexes with Schiff base like ligands and N-alkylimidazoles
Schlamp, Stephan,Lochenie, Charles,Bauer, Tobias,Kempe, Rhett,Weber, Birgit
, p. 408 - 413 (2015)
Three new iron(II) spin-crossover complexes with N2O2-coordinating Schiff base like equatorial ligands and alkylimidazole ligands in the axial positions were synthesised. The chain length of the alkylimidazole was varied from the previously published 1 to 5, 7 and 10 carbon atoms to investigate the influence of the alkyl chain length on the spin-transition behaviour in solution and in the solid state. The crystal structures of [1(HeptIm)2] and [1(DecIm)2] (1 = Fe complex with equatorial Schiff base like ligand; HeptIm = N-heptylimidazole, DecIm = N-decylimidazole) and the packing of the molecules in the crystals are discussed.
Self-assembled N-alkylimidazolium perfluorooctanesulfonates
Mukai, Tomohiro,Yoshio, Masafumi,Kato, Takashi,Ohno, Hiroyuki
, p. 442 - 443 (2005)
Thermostability of a smectic A phase composed of N-alkyl-imidazolium heptadecafluorooctanesulfonate was improved by the formation of nonpolar layer composed of mixed perfluoroalkyl and aliphatic chains. Copyright
NHC-silver(I) complexes as chemical nucleases; Synthesis, crystal structures, and antibacterial studies
Haque, Rosenani A.,Asekunowo, Patrick O.,Razali, Mohd. R.,Mohamad, Faisal
, p. 194 - 204 (2014/06/09)
A series of N-heterocyclic carbene (NHC) precursors, 1-methoxylethyl-3- allylimidazolium hexafluorophosphate (1), 1-ethyl-3-allylimidazolium hexafluorophosphate (2), and 1-pentyl-3-allylimidazolium hexafluorophosphate (3) were synthesized. These salts were treated with Ag2O to afford their corresponding mononuclear Ag(I)-NHC complexes, namely 1-methoxylethyl-3- allylimidazolium silver(I) hexafluorophosphate (4), 1-ethyl-3-allylimidazolium silver(I) hexafluorophosphate (5), and 1-pentyl-3-allylimidazolium silver(I) hexafluorophosphate (6), respectively. These compounds were characterized by physicochemical and spectroscopy techniques. Compounds 4 and 5 were structurally characterized by single crystal X-ray diffraction, and their stability in solution was investigated and found to be acceptable for the antibacterial studies. These new NHC precursors and their respective Ag-NHC complexes were screened for their antibacterial activities against Staphylococcus aureus (ATCC 12600) and Escherichia coli (ATCC 25922). Compounds 1-3 showed no inhibition, whereas 4-6 inhibited the growth of these bacteria. The nuclease activities of the reported compounds against plasmid DNA and RNA were assessed by gel electrophoresis, and the results indicate that complexes 5 and 6 can degrade both DNA and RNA in the absence of an oxidant.
