Stability of Divalent Europium in an Ionic Liquid:  Spectroscopic Investigations in 1-Methyl-3-butylimidazolium Hexafluorophosphate

Room-temperature ionic liquids are salts with a melting point close to or below room temperature. They form liquids composed in the majority of ions. This gives these materials the potential to behave very differently when they are used as solvents compared to conventional molecular liquids. The search for their application is growing in every area of analytical chemistryelectrochemistry, chromatography, electrophoresis, and even mass spectrometry. The literature on ionic liquids is growing almost exponentially. The basis for this activity is the easy preparation of salts with different ion constituents. This ability might best be described as the "chemical tunability" of ionic liquids, a class of solvents with members possessing similar physical properties but having different chemical behavior. Their good solvating properties, together with large spectral transparency, make ionic liquids suitable solvents for spectroscopic measurements. It has been demonstrated that task-specific ionic liquids have advantages compared to common solvents used as separation media in liquid-liquid extraction processes achieving high efficiencies and selectivities of separation. The main advantage for other applications of ionic liquids in analytical chemistry lies in their low volatility which makes them useful as solvents for working in both high-temperature (gas chromatography (GC) stationary phases) and high-vacuum (MALDI matrixes) environments. When using an ionic liquid as an electrolyte medium, it is possible to achieve a broader range of operational temperatures and conditions relative to other conventional electrolytic media, and this makes ionic liquids promising materials in various electrochemical devices (e.g., batteries, fuel cells, sensors, and electrochromic windows).

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“…(75). Results from smallangle X-ray scattering indicate that the pure solvent exhibits a local organization.…”

Section: Solvents For Spectroscopymentioning

confidence: 99%

Ionic Liquids in Chemical Analysis

Koel

2005

Critical Reviews in Analytical Chemistry

328

195

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“…The purification procedure previously used for BumimPF 6 [27] was also applied to BumimTf 2 N. However, the absorption band in the range 250Ϫ300 nm observed for non-purified BumimPF 6 , [27] was still present in the absorption spectrum of the purified BumimTf 2 N (Figure 1). It is probable that some organic impurities still remain.…”

Section: Purification and Characterizationmentioning

confidence: 99%

Eu^III Luminescence in a Hygroscopic Ionic Liquid: Effect of Water and Evidence for a Complexation Process

Billard¹,

Mekki²,

Gaillard³

et al. 2004

Eur J Inorg Chem

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The spectroscopic characteristics (excitation, emission and lifetime) of EuIII dissolved in 1‐methyl‐3‐butylimidazolium bis(trifluoromethanesulfon)imide (BumimTf2N) are reported. In a first series of experiments, the effect of the presence of water in BumimTf2N was examined. It appears that non‐degassed solutions are most probably inhomogeneous, displaying large water clusters leading to an intense diffusion of the red light of an He:Ne laser. In these samples, the Eu emission spectrum is close to that observed in slightly acidic aqueous solutions. In contrast, when the samples were degassed the solution appeared homogeneous and water can be considered as a competitive ligand for the first coordination sphere of Eu. In a subsequent series of experiments, tetrabutylammonium chloride (TBACl) was added to the solution and the resultant species investigated. The ensuing enhancement in the metal‐centered luminescence has been interpreted in terms of changes in the inner coordination sphere of the EuIII ion and possible structures are discussed. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)

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“…Accordingly, we can design a fluorescent chemosensor for fluoride anions. In general, free imidazolium do not have visible light absorption [20][21][22][23]. To improve the photoabsorption properties of imidazolium cations, some groups with conjugated structures can be introduced into the imidazolium skeleton [24,25].…”

Section: Introductionmentioning

confidence: 99%

Time-Dependent Density Functional Theory Study on a Fluorescent Chemosensor Based on C–H•••F Hydrogen-Bond Interaction

Li¹

2013

CiCC

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Abstract:A new fluorescent chemosensor bearing two imidazolium groups was designed and investigated by DFT/TDDFT method. The fluoride-sensing mechanism of the chemosensor was studied by the geometry optimization, two-dimensional potential energy surface (PES) scan, absorption/emission spectra simulation, and frontier molecular orbital (FMO) analysis. The calculations show that this chemosensor displays an emission band at 407 nm. PES scan confirmed that the excited state proton transfer (ESPT) process of the chemosensor-fluoride complex is barrierless. The ESPT process took place in the C-H•••F hydrogen bond with C-H moiety acting as a proton donor and the fluoride anion acting as a proton acceptor. This process proved that addition of fluoride anion could lead to the formation of the carbene form of the chemosensor.Due to the nπ-type transition mode obtained by FMO, the carbene form has a red-shift emission band at 523 nm.

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Stability of Divalent Europium in an Ionic Liquid: Spectroscopic Investigations in 1-Methyl-3-butylimidazolium Hexafluorophosphate

Cited by 148 publications

References 42 publications

Ionic Liquids in Chemical Analysis

Ionic Liquids in Chemical Analysis

Eu^III Luminescence in a Hygroscopic Ionic Liquid: Effect of Water and Evidence for a Complexation Process

Time-Dependent Density Functional Theory Study on a Fluorescent Chemosensor Based on C–H•••F Hydrogen-Bond Interaction

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Stability of Divalent Europium in an Ionic Liquid: Spectroscopic Investigations in 1-Methyl-3-butylimidazolium Hexafluorophosphate

Cited by 148 publications

References 42 publications

Ionic Liquids in Chemical Analysis

Ionic Liquids in Chemical Analysis

EuIII Luminescence in a Hygroscopic Ionic Liquid: Effect of Water and Evidence for a Complexation Process

Time-Dependent Density Functional Theory Study on a Fluorescent Chemosensor Based on C–H•••F Hydrogen-Bond Interaction

Contact Info

Product

Resources

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Eu^III Luminescence in a Hygroscopic Ionic Liquid: Effect of Water and Evidence for a Complexation Process