title: Spectroscopic study on imidazolium-based ionic liquids: effect of alkyl chain length and anion.
abstract: Room temperature ionic liquids are currently used as functional materials in several application and their optical investigation can provide a better understanding of their physical and chemical behavior. Absorption and emission properties of imidazolium-based ILs have been attributed to the imidazolium moiety and related to the presence of energetically different aggregates. Here, time-integrated and time-resolved investigation has been carried out on 1-alkyl-3-methylimidazolium tetrafluoroborate and hexafluorophosphate ionic liquids with different chain lengths in order to probe the occurrence of energy transfer processes, and hence to disclose the presence of various states with different energy. Such a study contributes to provide relevant insight on the effect of alkyl chain and anion type on the emission characteristics, and, hence, on the presence of associated structures.
authors.affiliation: CNR-IPCF Bari Division, c/o Chemistry Department, via Orabona 4, 70126 Bari, Italy.
authors.forename: Enrico
authors.initials: E
authors.lastname: Binetti
authors.forename: Annamaria
authors.initials: A
authors.lastname: Panniello
authors.forename: Leonardo
authors.initials: L
authors.lastname: Triggiani
authors.forename: Raffaele
authors.initials: R
authors.lastname: Tommasi
authors.forename: Angela
authors.initials: A
authors.lastname: Agostiano
authors.forename: Maria Lucia
authors.initials: ML
authors.lastname: Curri
authors.forename: Marinella
authors.initials: M
authors.lastname: Striccoli
mesh_terms: D000838:Anions / Q000737:chemistry*; D031541:Fluorescence Resonance Energy Transfer; D007093:Imidazoles / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors
chemical_list: C419324:1-butyl-3-methylimidazolium tetrafluoroborate; D000838:Anions; D007093:Imidazoles; D052578:Ionic Liquids