Poly(ionic liquids) as “smart” stabilizers for metal nanoparticles

Charan, K. T. Prabhu; Pothanagandhi, Nellepalli; Vijayakrishna, Kari; Sivaramakrishna, Akella; Mecerreyes, David; Sreedhar, B.

doi:10.1016/j.eurpolymj.2014.09.004

Cited by 79 publications

(41 citation statements)

References 49 publications

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“…[2][3][4][5][6][7] Since the past few decades, they have attracted significant attention of the researchers owing to their unique physiochemical properties 8 such as low vapour pressure, recyclability, non-volatility, and non-combustibility. [2][3][4][5][6][7] Since the past few decades, they have attracted significant attention of the researchers owing to their unique physiochemical properties 8 such as low vapour pressure, recyclability, non-volatility, and non-combustibility.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of imidazolium-based ionic liquids towards vermicidal activity: in vitro & in silico studies

et al. 2015

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A series of six different ionic liquids (ILs) of the kind 1-alkyl-3-methylimidazolium bromide/hydroxide (IL-Br and IL-OH) tailored with different N-alkyl side chains (ethyl, butyl, octyl) were synthesized and evaluated for their vermicidal activity against Indian earthworm, Pheretima posthuma. The percentage of paralysis and mortality of earthworms against ILs were recorded in dose dependent (at different concentrations 2, 4, 8 and 16 mM) and time dependent manner. ILs with hydroxide as counter anion (IL-OH) showed higher vermicidal activity compared to their bromide counter parts (IL-Br). Moreover, ILs with the longest alkyl chain (octyl) are observed with significant vermicidal activity compared to the rest (ethyl and butyl) as well as the standard drug, Albendazole. Furthermore, theoretical modeling was carried out to visualize the preferential docking positions of these ILs into the active site of β-Tubulin.Fascinatingly, it was found that ILs with longest alkyl side chain showed remarkable vermicidal activity compared to the rest and the molecular docking studies not only validated the 2 experimental results but also showed per residue interaction analysis between ILs and different components of β-Tubulin.

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Section: Introductionmentioning

confidence: 99%

Evaluation of imidazolium-based ionic liquids towards vermicidal activity: in vitro & in silico studies

et al. 2015

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“…Poly(ionic liquids) of the type poly(1-vinyl-3-alkyl imidazolium)hydroxide (PIL-OH) where Rc an be ethyl (PIL-1), butyl (PIL-2), or pentyl (PIL-3)( Figure1)w ere prepared as per our previously reported procedure. [19] The molecular weights, M n (polydispersity index,P DI) of (PIL-1),( PIL-2), and (PIL-3) are 20 800 (1.40), 24 400 (1.56),a nd 26 800 (1.57), respectively.T he synthesized PILs were employed to prepares table Ni-NPs.T he surfacep lasmon resonances for PIL-stabilized Ni-NPs were found around 350-360nmi nt he UV/Vis spectra ( Figure S1 in the Supporting Information), which is characteristic for Ni-NPs. [20] Ag raduali ncreasei nl max of the PIL-stabilized Ni-NPs was observedw ith increasing alkyl chain length of the PILs.…”

Section: Synthesis and Characterization Of Pil-stabilized Ni-npsmentioning

confidence: 99%

“…[14][15][16] The use of Ni-NPs is of increasing interesto wing to their intrinsic properties such as magnetic nature, commercial availability, high reactivity,a nd the large surface area,w hich has directed researchers towards the development of stable Ni-NPsi nt he solutionp hase with advantages in various fields of science and technology. [17][18][19][20] Ni-NPs in solutionp hase tend to be unstable and easily lose their catalytically reactive surface area. Hence, it is of paramount importance to stabilize them to preventt heir agglomeration, whichr esults in the formation of bulk metal.…”

Section: Introductionmentioning

confidence: 99%

“…[14,31] Recently,w eh ave investigated the preparation of stable Ag, Au, and Ni-NPs in the solution phase by using poly(ionic liquids) or PILs as smart stabilizers and we have reported the preliminary resultso nt he reduction of aromatick etones catalyzed by PIL-Br stabilized Ni-NPsi nIPA by using KOH as an additional base. [19] Alonso andc o-workers have pioneered Ni-NPs-catalyzed TH reactions [5,11] and they were the first to report on the catalytic application of stable Ni-NPs in base-free TH reactions. [15,32,33] Hence, it is noteworthy to explore TH reduction reactions catalyzed by Ni-NPs without any additional base.…”

Section: Introductionmentioning

confidence: 99%

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Ni Nanoparticles Stabilized by Poly(Ionic Liquids) as Chemoselective and Magnetically Recoverable Catalysts for Transfer Hydrogenation Reactions of Carbonyl Compounds

et al. 2016

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Imidazolium‐based poly(ionic liquids) with hydroxide as the counter anion were employed to prepare stable aqueous dispersion of Ni nanoparticles. The synthesized poly(ionic liquid) stabilized Ni nanoparticles (PIL‐Ni‐NPs) were characterized by thermogravimetric analysis (TGA), vibrating sample magnetometry (VSM), powder XRD, TEM, Brunauer–Emmett–Teller (BET) surface area measurements, X‐ray photoelectron spectroscopy (XPS), EPR, and UV/Vis spectroscopy. The PIL‐Ni‐NPs possess good catalytic activity towards transfer hydrogenation (TH) reactions of carbonyl compounds to their alcohol derivatives, in isopropanol at 80 °C in the absence of any additional base. This catalyst system chemoselectively reduces only the carbonyl group of α,β unsaturated carbonyl compounds. The magnetically separable PIL‐Ni‐NPs were recycled and reused for further TH reactions.

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“…In that work, the quaternarization step was performed in solution because the starting poly(VIm) is soluble methanol. 31 On the contrary, in our study the quaternarization steps were performed in heterogeneous phase due to the cross-linked state of the starting polymers…”

Section: Introductionmentioning

confidence: 99%

Design of high surface area poly(ionic liquid)s to convert carbon dioxide into ethylene carbonate

et al. 2015

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A series of porous poly(ionic liquid)s (PILs) were synthesized using an innovative method which involves the synthesis of a non-ionic co-polymer of divinylbenzene and vinylimidazole, followed by an alkylation step to introduce the Io nic Liquid functionality in the polymeric matrix. This synthetic strategy allowed to obtain tuneable imidazolium type PILs having simultaneously high surface area and exposed ionic moieties. A set of PILs was obtained changing systematically the alkyl chains, the anions and the cross-link degree. This approach allowed to elucidate the effect of each synthetic variable on the catalytic performances of PILs towards carbon dioxide cycloaddition reaction in very mild conditions (room temperature and low pressure). Finally, in-situ FTIR spectroscopy allowed to establish a relation between structure of PILs and their catalytic properties.

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Poly(ionic liquids) as “smart” stabilizers for metal nanoparticles

Cited by 79 publications

References 49 publications

Evaluation of imidazolium-based ionic liquids towards vermicidal activity: in vitro & in silico studies

Evaluation of imidazolium-based ionic liquids towards vermicidal activity: in vitro & in silico studies

Ni Nanoparticles Stabilized by Poly(Ionic Liquids) as Chemoselective and Magnetically Recoverable Catalysts for Transfer Hydrogenation Reactions of Carbonyl Compounds

Design of high surface area poly(ionic liquid)s to convert carbon dioxide into ethylene carbonate

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