A range of phosphonium ionic liquids having the generic formula [PR 3 R9]X (R and R9 are alkyl groups; X is halide, trifluoromethanesulfonate, bis(trifluoromethylsulfonyl)imide, nitrate, dialkylphosphinate, dicyanamide, decanoate, tetrafluoroborate, hexafluorophosphate, or diisobutyldithiophosphinate have been prepared, characterised, and tested for anti-microbial activity and anti-electrostatic properties. Within this group of phosphonium salts, in contrast to their 1-alkyl-3-methylimidazolium analogues, both cation structure and the type of anion have effects on their biological activity. The ionic liquids also showed high anti-electrostatic effect.
A new group of quaternary ammonium lactate based ionic liquids have been prepared and characterized. Didecyldimethylammonium (DDA) and benzalkonium (BA) D,L- and L-lactates are air-stable, hydrophilic, surface-active salts. They are very effective antibacterial and antifungal agents, especially the DDA lactates, against Streptococcus mutants and Candida albicans. Their activities are comparable or more effective than the original benzalkonium chloride. In addition, they have been shown to be good insect-feeding deterrents. However, they are poor antifungal agents for wood preservation. The toxicity of the DDA and BA lactates has also been studied and the results are presented in this paper.
The continuing increase of interest in ionic liquids prompts us to search both for new compounds and for their new potential application. The aim of this study was to examine the influence of ionic liquids (ILs) on the cellulose product, paper. In the studies, commercially available 3-alkyl-1-methylimidazolium tetrafluoroborates and prepared 3-alkoxymethyl-1-methylimidazolium tetrafluoroborates and 3-alkoxymethyl-1-methylimidazolium bis(trifluoromethanesulfonyl)imides were used. Obtained salts with bis(trifluoromethanesulfonyl)imide anion are new compounds. ILs were found to impregnate paper, affecting its strength and other physical parameters. Various properties of paper were distinctly altered after treatment with ILs of varying anions. In general, IL-treated paper had decreased strength, which resulted from weakening of cellulose hydrogen bonds. On the other hand, paper wettability improved. Paper treated with 1-methyl-3octyloxymethylimidazolium tetrafluoroborate proved to be fully resistant to activity of moulds and fungi, inducing the blue discoloration of the paper.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.