Search results for "anion effect"

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Insights into the anion effect on the self assembly of perylene bisimide diimidazolium salts

2017

Abstract We studied how changing the anion affects the self-assembly of three diimidazolium salts bearing a perylene bisimide spacer. In particular we used [BF 4 − ] and [NTf 2 − ] based salts together with a mixed salt bearing both [I − ] and [BF 4 − ] anions. Thermal as well as concentration and temperature dependent spectroscopic investigations revealed that changing the anion impacts on solid state and solution aggregation, leading to articulate thermotropic behaviors and contrasting solvent effects, respectively. We also studied the electrochemical behavior of the salts to verify if changing the anion alters the redox properties of the salts. Finally, different anions also lead to very…

General Chemical EngineeringDiimidazolium saltSalt (chemistry)010402 general chemistryPhotochemistryElectrochemistry01 natural sciencesThermotropic crystalRedoxIonchemistry.chemical_compoundAnion effectPolymer chemistryChemical Engineering (all)chemistry.chemical_classification010405 organic chemistryProcess Chemistry and TechnologyDiimidazolium saltsAnion effect; Diimidazolium salts; Perylene bisimide; Self assembly; Chemical Engineering (all); Process Chemistry and TechnologySettore CHIM/06 - Chimica OrganicaSelf assembly0104 chemical scienceschemistryPerylene bisimideSelf-assemblySolvent effectsPeryleneDyes and Pigments
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STABILITY AND ORGANOCATALYTIC EFFICIENCY OF N-HETEROCYCLIC CARBENES ELECTROGENERATED IN ORGANIC SOLVENTS FROM IMIDAZOLIUM IONIC LIQUIDS

2015

The kinetic of degradation of 1-butyl-3-methylimidazole-2-ylidene (selected as model N-heterocyclic carbene - NHC), generated in organic solvents by cathodic reduction of the parent 1-butyl-3- methylimidazolium salts BMIm-X, was studied by a simple voltammetric analysis. The effect of NHC degradation rate on the efficiency of an organocatalyzed reaction (the synthesis of g-butyrolactone from cinnamaldehyde and trifluoromethylacetophenone) was investigated. The nature of the solvent and of the anion X have a remarkable effect on the stability of the NHC, the bis(trifluoromethylsulfonyl) imide anion being the best for a long lasting carbene (while acetonitrile seems to be the worst solvent). …

n-heterocyclic carbinen-heterocyclic carbeneHydrogen bondanion effect; cyclic voltammetry; ionic liquid; n-heterocyclic carbene; n-heterocyclic carbine; organocatalysisGeneral Chemical EngineeringSettore CHIM/06 - Chimica Organicacyclic voltammetryCinnamaldehydeSolventchemistry.chemical_compoundchemistryOrganocatalysisPolymer chemistryIonic liquidElectrochemistryOrganic chemistryorganocatalysiscyclic voltammetry N-heterocyclic carbene organocatalysis ionic liquid anion effectImideAcetonitrileCarbeneanion effectionic liquid
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