30904-42-8Relevant articles and documents
Nucleophilicity in ionic liquids. 2.1 Cation effects on halide nucleophilicity in a series of bis(trifluoromethylsulfonyl)imide ionic liquids
Llewellyn Lancaster,Salter, Paul A.,Welton, Tom,Brent Young
, p. 8855 - 8861 (2002)
In this work, the nucleophilicities of chloride, bromide, and iodide have been determined in the ionic liquids [bmim] [N(Tf)2], [bm2im][N(Tf)2], and [bmpy][N(Tf)2] (where bmim = 1-butyl-3-methylimidazolium, bm2im = 1-butyl-2,3-dimethylimidazolium, bmpy = 1-butyl-l-methylpyrrolidinium, and N(Tf)2 = bis(trifluoromethylsulfonyl)imide). It was found that in the [bmim]+ ionic liquid, chloride was the least nucleophilic halide, but that changing the cation of the ionic liquid affected the relative nucleophilicities of the halides. The activation parameters ΔH?, ΔS?, and ΔG? have been estimated for the reaction of chloride in each ionic liquid, and compared to a similar reaction in dichloromethane, where these parameters were found for reaction by both the free ion and the ion pair.
Nucleophilicity in ionic liquids. 3. Anion effects on halide nucleophilicity in a series of 1-butyl-3-methylimidazolium ionic liquids
Lancaster, N. Llewellyn,Welton, Tom
, p. 5986 - 5992 (2004)
We have continued the study of halide nucleophilicity in ionic liquids, concentrating on the effect of changing the anion ([BF4]-, [PF6] -, [SbF6]-, [OTf]-, and [N(Tf) 2]-) when the cation is [bmim]+ (where bmim = 1-butyl-3-methylimidazolium). It was found that the nucleophilicities of all the halides were lower in all of the ionic liquids than in dichloromethane. Changing the anion affected the order of halide nucleophilicity, e.g., in [bmim][BF4] the order of nucleophilicity was Cl ->Br->I- while in [bmim][N(Tf) 2] the order was Cl---. It was also found that the nucleophilicity of each halide was different in each ionic liquid, with chloride being almost four times as nucleophilic in [bmim][BF4] as in [bmim][SbF6]. Similarly bromide was more than four times as nucleophilic in [bmim][BF4] as in [bmim][PF 6]. The activation parameters ΔG?, ΔH?, and ΔS? have been measured for the reaction of chloride in each of the ionic liquids, plus the reaction of bromide in [bmim][BF4] and [bmim][PF6]. These data were also compared to each other as well as to a similar reaction in dichloromethane (where these parameters have been estimated for both the free ion and the ion-pair). These studies show that the reaction in the ionic liquids has a high activation free energy barrier, due to the solvent-solute interactions within the ionic liquids. These interactions are described and discussed.
Selective oxidation of benzyl alcohol to benzaldehyde, 1-phenylethanol to acetophenone and fluorene to fluorenol catalysed by iron (II) complexes supported by pincer-type ligands: Studies on rapid degradation of organic dyes
Singh, Ovender,Gupta, Priyanka,Singh, Anshu,Maji, Ankur,Singh, Udai P.,Ghosh, Kaushik
, (2019/03/17)
Hexacoordinated non-heme iron complexes [FeII(L1)2](ClO4)2 (1) and [FeII(L2)2](PF6)2 (2) have been synthesized using ligands L1?=?(E)-2-chloro-6-(2-(pyridin-2ylmethylene) hydrazinyl)pyridine and L2?=?(E)-2-chloro-6-(2-(1-(pyridin-2-yl)ethylidene)hydrazinyl) pyridine]. These complexes are highly active non-heme iron catalysts to catalyze the C (sp3)?H bonds of alkanes. These iron complexes have been characterized using ESI?MS analysis and molecular structures were determined by X-ray crystallography. ESI???MS analysis also helped to understand the generation of intermediate species like FeIII?OOH and FeIV=O. DFT and TD?DFT calculations revealed that the oxidation reactions were performed through high-valent iron center and a probable reaction mechanism was proposed. These complexes were also utilized for the degradation of orange II and methylene blue dyes.
