179075-88-8Relevant articles and documents
Determination of successive complexation constants in an ionic liquid: complexation of uo22+ with no3- in c4-mintf2n studied by uv-v is spectroscopy
George, Sylvia,Billard, Isabelle,Ouadi, Ali,Gaillard, Clotilde,Petitjean, Laetitia,Picquet, Michel,Solov'Ev, Vitaly
, p. 4276 - 4282 (2010)
The complexation of UO22+ with NO3 - has been investigated in the ionic liquid l-butyl-3- methylimidazolium bis(trifluoromethylsulfonyl)imide by UV-vis spectroscopy at T = 18.5?°C. The complexation is evidenced through the appearance of four peaks at 425, 438, 453, and 467 nm. EXAFS data indicate that the trinitrato complex, UO2(NO3)3-, is dominating the speciation for a reagent ratio of [NO3-]/[UO 2-]>3. Assuming three successive complexation steps, the conditional stability constants are calculated, the individual absorption spectra are derived, and a speciation plot is presented. ? 2010 American Chemical Society.
Stable gasoil/sunflower oil fuel microemulsions prepared by using methylimidazolium based ionic liquids as surfactant
Najjar, Reza,Zarei-Gharehbaba, Laya,Tazerout, Mohand,Patil, Sandeep R.
, (2020)
The fuel microemulsions of water in a 4:1 (v:v) blend of gasoil and sunflower oil (respectively) by using of 1-dodecyl-3-methylimidazolium nitrate ([C12mim][NO3]) and 1-butyl-3-methyl imidazolium nitrate ([Bmim][NO3]) ionic liquids as surfactant and 1-butanol as co-surfactant. Also, the performance of 50:50 wt% blend of the mentioned ionic liquids with Span 80 as surfactant was evaluated in this work. The comparison of the phase diagrams of the samples has revealed a larger single phase region for samples prepared with ionic liquids than the conventional Span 80 surfactant or their blends with Span 80. The dynamic viscosity, and density of two samples with high oily phase content was measured according to the standards showing very close values to the net diesel fuel. DLS analysis indicated a water droplets of 9 nm (up to 70%) for [Bmim][NO3], 3–6 nm (up to 64–82%) for [C12mim][NO3], and 331 nm (up to 53%) for systems prepared by Span 80. Meanwhile, a very narrow size distribution was observed for the samples prepared by ionic liquids. No phase separation has been observed for the prepared samples over 6 months on the shelf.
Ionic liquids promoted the CH oxidation of alcohols to carbonyl compounds using a new polysiloxane-supported (salen)chromium(III) catalyst
Zhou, Guojun,Zhang, Zhaorui,Feng, Xin,Dang, Bobo,Li, Xiaoyong,Sun, Yang
, p. 69 - 73 (2012)
An ion-exchangeable layered polysiloxane was first used as support for immobilizing a sulphonato-(salen)chromium(III) complex, and the resulted catalyst exhibited moderate to great reactivities in the CH oxidation of different alcohols into carbonyl compounds when aqueous hydrogen peroxide were employed as oxidant. And then three room temperature ionic liquids were loaded respectively for the purpose of recycling, and indeed the ionic liquid phases containing catalyst could be recycled effectively. At last, a novel layered structure of the supported catalyst was afforded and briefly discussed after X-ray powder diffraction analysis.
The impact of ionic liquids on the coordination of anions with solvatochromic copper complexes
Kuzmina,Hassan,Patel,Ashworth,Bakis,White,Hunt,Welton
supporting information, p. 12185 - 12200 (2017/09/25)
Solvatochromic transition metal (TM)-complexes with weakly associating counter-anions are often used to evaluate traditional neutral solvent and anion coordination ability. However, when employed in ionic liquids (IL) many of the common assumptions made are no longer reliable. This study investigates the coordinating ability of weakly coordinating IL anions in traditional solvents and within IL solvents employing a range of solvatochromic copper complexes. Complexes of the form [Cu(acac)(tmen)][X] (acac = acetylacetonate, tmen = tetramethylethylenediamine) where [X]- = [ClO4]-, Cl-, [NO3]-, [SCN]-, [OTf]-, [NTf2]- and [PF6]- have been synthesised and characterised both experimentally and computationally. ILs based on these anions and imidazolium and pyrrolidinium cations, some of which are functionalised with hydroxyl and nitrile groups, have been examined. IL-anion coordination has been investigated and compared to typical weakly coordinating anions. We have found there is potential for competition at the Cu-centre and cases of anions traditionally assigned as weakly associating that demonstrate a stronger than expected level of coordinating ability within ILs. [Cu(acac)(tmen)][PF6] is shown to contain the least coordinating anion and is established as the most sensitive probe studied here. Using this probe, the donor numbers (DNs) of ILs have been determined. Relative donor ability is further confirmed based on the UV-Vis of a neutral complex, [Cu(sacsac)2] (sacsac = dithioacetylacetone), and DNs evaluated via23Na NMR spectroscopy. We demonstrate that ILs can span a wide donor range, similar in breadth to conventional solvents.
