Greatly enhanced fluorescence of dicyanamide anion based ionic liquids confined into mesoporous silica gel

Zhang, Juan; Zhang, Qinghua; Shi, Feng; Zhang, Shiguo; Qiao, Botao; Liu, Lequan; Ma, Yubo; Deng, Youquan

doi:10.1016/j.cplett.2008.07.015

Cited by 44 publications

(38 citation statements)

References 28 publications

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“…Le Bideau et al [24] did not specifically report a shift in NMR but they did find broadening of NMR peaks of IL in confined geometry. The expected changes in the vibrational spectra in the confined geometry could not be observed by Gçbel et al [44] but Oter et al [46] and Deng et al [47] did report significant changes in the peak positions and intensity of optical fluorescence in [EMIM] cation based ILs with different anions when entrapped in porous silica matrix. Deng et al [47] in particular, have also studied changes in FT-Raman spectra and noted significant shifts in N=C (n s ) vibrations due to conformational changes on confinement and they have correlated this with the changes in optical fluorescence.…”

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confidence: 84%

Properties of Ionic Liquid Confined in Porous Silica Matrix

Singh¹,

Singh²,

Chandra³

2010

ChemPhysChem

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Porous silica matrices of different pore sizes with confined ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate) [BMIM] [PF(6)] were prepared by sol-gel technique using a tetraethyl orthosilicate (TEOS) precursor with an aim to study the changes in physico-chemical properties of ionic liquid on confinement. It is found that on confinement 1) melting point decreases, 2) fluorescence spectra shows a red shift and 3) the vibrational bands are affected particularly those of imadazolium ring, which interacts more with the walls of the silica matrix. Preliminary theoretical calculations suggest that SiO(2) matrix interact more with the heterocyclic group of [BMIM] cation than the tail alkyl chain end group resulting in significant changes in the aromatic vibrations.

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confidence: 84%

Properties of Ionic Liquid Confined in Porous Silica Matrix

Singh¹,

Singh²,

Chandra³

2010

ChemPhysChem

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“…Pore volume, surface area and pore diameter of the ionogel obtained with [THN][Dca] are reported in Table 4. These results are compared to those obtained with other ionogels synthesized with dca-based IL containing imidazolium or S-ethyltetrahydrothiophene (Eth) cations at the same IL loading [41]. The use of THN + cation led to higher specific surface area (1021 m 2 .g -1 ) and pore volume (1.05 cm 3 .g -1 ) but to a significant decrease of pore size.…”

Section: A Synthesis and Characterization Of Ionogelsmentioning

confidence: 86%

“…Silica ionogels containing Dcaanions have been elaborated by Deng and collaborators using the aqueous route in the presence of diluted hydrochloric acid [41,42]. We thus turned out to the aqueous acidic route.…”

Section: A Synthesis and Characterization Of Ionogelsmentioning

confidence: 99%

Selective Cobalt over Nickel separation using neat and confined ionic liquids

Boudesocque

Viau

Dupont

2020

Journal of Environmental Chemical Engineering

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Task Specific Ionic Liquids (TSILs) generated by association between tetraalkylammonium cations and coordinating anions such as dicyanamide (Dca -) and thiocyanate (SCN -) were used for the selective separation of Ni(II) over Co(II). SCN-based TSIL presents higher extraction efficiency than the Dca-based one towards Co(II) (E = 85.4 % vs 54.6 %) and Ni (II) (E = 22 % vs 0.5%) but lower separation factors (Co/Ni = 21 vs 239). Interestingly, extraction of Co (II) and Ni(II) in Dca-based TSIL can be enhanced using salts with chaotropic anions such as NaNO3 (E > 90 % for Co(II) and E = 85% for Ni(II)). The use of NaCl allows, moreover, the efficient separation of both ions with Co/Ni >1000. The metal can be recovered from the IL phase using Na2SO4 aqueous solution to limit the release of the IL and to ensure a good recyclability of this latter. The confinement of TSIL in silica -matrix ionogel constitutes a valuable method to improve the handling of the IL. Indeed, the extraction properties of the ionogel containing [THN][Dca] IL are very close to those obtained using the same neat IL with an efficient separation of Co(II) over Ni(II) in NaCl 4 mol.L -1 (Co/Ni >1000). Finally, the recyclability of the ionogel was studied and found comparable to that of neat IL.

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“…Recently fluorescent ionic liquids (FILs) have received great attention due to their wide applicability in sensor techniques. Many reports have been exploring synthesis and studies of FILs, for instance, benzobis(imidazolium) ILs, Europium based luminescent ILs, dicyanamide based ILs confined into mesoporous silica gel, dendrimers based photoluminescent hydrophobic Brønsted acidic and basic ILs, gold and silver based luminescent ILs, imidazolium based fluorescent ionic liquid crystals, metal containing fluorescent ILs, high quantum yield quinolizinium ILs and so on. Distinct advantages of fluorescent IL sensors over other sensory materials can be revealed in terms of their easy synthesis, low toxicity, tunable water solubility, environmental benign nature, high thermal stability, selectivity and sensitivity as well as liquid state and solution based fluorescence etc .…”

Section: Introductionmentioning

confidence: 99%

Amide Functionalized Ionic Liquid as Facile Fluorescent Probe for Detection of Nitrophenolic Compounds

et al. 2017

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Detection of nitrophenolic compounds has great importance concerning to its environmental and health hazards. Herein, we are exploring a simple, thermally stable amide functionalized task specific ionic liquid (TSIL), 3-(2-amino-2-oxoethyl)-1-methylimidazolium chloride, [AmoMIM] [Cl] as an effective fluorescent probe for detection of water soluble nitrophenolic compounds viz. picric acid (PA) and p-nitrophenol (NP). The proposed method provides a straightforward detection proce-dure anchored in significant quenching of fluorescence of TSIL by nitrophenols in aqueous medium. Under the optimized conditions the probe offers good linear relationship within the studied detection range with limits of detection (LOD) found to be 0.43 and 0.38 mg mL À1 for PA and NP, respectively. The plausible static fluorescence quenching mechanism accomplished with ground state complex formation is also discussed.[a] S.

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Greatly enhanced fluorescence of dicyanamide anion based ionic liquids confined into mesoporous silica gel

Cited by 44 publications

References 28 publications

Properties of Ionic Liquid Confined in Porous Silica Matrix

Properties of Ionic Liquid Confined in Porous Silica Matrix

Selective Cobalt over Nickel separation using neat and confined ionic liquids

Amide Functionalized Ionic Liquid as Facile Fluorescent Probe for Detection of Nitrophenolic Compounds

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