Imidazolium based ionic liquids as novel benign media for liquid-dye laser systems

AL-Aqmar, Dalal M.; Abdelkader, H.I.; Kana, Maram T.H. Abou

doi:10.1016/j.molliq.2017.02.019

Cited by 15 publications

(7 citation statements)

References 33 publications

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“…of the long surviving component begins a gradual decrease in intensity and shifts to red range. This finding conformed to our previous works [22][23][24]. Figure 4a-c displays the absorption spectra of IR-792, with various concentrations.…”

Section: Resultssupporting

confidence: 91%

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Spectroscopic and Photo-Physical Properties of Near-IR Laser Dye in Novel Benign Green Solvents

et al. 2020

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IR-792 as near IR (NIR) laser dye was dissolved with different concentrations in two types of ionic liquids (ILs) of different anion and cation, 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (EMIM TFSI) & 1-Butyl-3-methylimidazolium tetrafluoroborate (BMIM BF 4 ), as the benign green solvent and in methanol (MeOH) as a standard solvent. The behavior of fluorescence of IR-792 dye was studied. The fluorescence of IR-792 dissolved in the ILs was heavily compared to organic solvent. Some photo-physical parameters of IR-792 were calculated. Mainly, IR-792 had a very low quantum yield of fluorescence with high intersystem crossing rate & fluorescence lifetime in picosecond range. Optical absorption and behavior of fluorescence for the rigorously the purified imidazolium ILs in the neat condition and effect of IR-792 on their fluorescence have been examined. The emission behavior of IR-792 in green solvents was independent upon the wavelength of excitation, while the emission behavior of green solvents dependent upon the wavelength of excitation whether in pure state or with NIR laser dye. At most, the intensity of fluorescence of ILs is dependent upon dye concentration.

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Section: Resultssupporting

confidence: 91%

“…Acknowledgments The authors would like to thank Cairo University for Supporting and funding this work through project no. (16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33).…”

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confidence: 99%

Spectroscopic and Photo-Physical Properties of Near-IR Laser Dye in Novel Benign Green Solvents

et al. 2020

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“…ILs based on the imidazolium cation are the most widely investigated among those available, and a variety of functional groups have been attached to the imidazolium cation to modify their physical and chemical properties . For traditional imidazolium ILs, it have been demonstrated that the unique excitation wavelength-dependent fluorescence behaviors originate from the heterogeneity of the ILs molecular structure. − As we know, the unusual fluorescence phenomena of ILs are very similar to those showed by various dipolar solutes in viscous media on excitation at the red-edge of the absorption band, which is commonly defined as the red-edge effect (REE) . From our previous studies, different from most imidazolium ILs with low fluorescence efficiency, symmetrical hydrophilic ionic liquids, for example, 1,3-butylimidazolium chloride, display high fluorescence efficiency. − Encouraged by these advantages, Brønsted acidic ILs were selected to be introduced into the Ln-MOCs for luminescence ratiometric thermometers.…”

Section: Introductionmentioning

confidence: 98%

Dual-Emitting Ratiometric Luminescent Thermometers Based on Lanthanide Metal–Organic Complexes with Brønsted Acidic Ionic Liquids

et al. 2022

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By introducing Brønsted acidic ionic liquids (ILs), two dualemitting lanthanide metal−organic complexes (Ln-MOCs) of {[Ln(imdc)-(CH 3 OH)(H 2 O) 3 ]Cl 2 } n (LnIMDC, Ln = Eu and Tb, imdc = 1,3bis(carboxymethyl)imidazolium ion) were first prepared under solvothermal conditions. The crystal structures of LnIMDC were measured by single-crystal X-ray diffraction, and the crystal growth process of LnIMDC was carefully studied. It is found that the crystals are three-dimensional supramolecular structures built up by Ln−O coordination bonds and supramolecular forces. In the temperature range of 303−403 K, LnIMDC show good temperaturedependent emission properties with maximum relative thermal sensitivities of 3.29% K −1 at 375 K and 2.08% K −1 at 303 K for EuIMDC and TbIMDC, respectively. It is worth mentioning that both EuIMDC and TbIMDC exhibit good linear ratiometric emission−temperature response in temperature ranges of 353−403 and 323−373 K, respectively, which render EuIMDC and TbIMDC good ratiometric thermometers in high temperature range. Computational studies on the energy level of ILs [H 2 imdc]Cl and [imdc] − ion were performed, which validated the high energy transfer efficiency between the [imdc] − and Ln 3+ ions and the unique solution concentration-and wavelength-dependent fluorescence properties of [H 2 imdc]Cl. The high fluorescence performance opens up new opportunities for practical applications of ILs in optical sensing.

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“…Therefore, ILs are considered to be an attractive substitute of conventional volatile organic solvents. As a kind of green solvents, ILs have also been used in analytical chemistry including separation field, chromatography, and spectrometry over the past few years . There are large number of natural compounds, such as alkaloids, flavonoids, and terpenoids, that are extracted and purified using ILs as solvent .…”

Section: Introductionmentioning

confidence: 99%

Isolation and purification of alkaloids from lotus leaves by ionic‐liquid‐modified high‐speed countercurrent chromatography

Xie

Fang

et al. 2017

J of Separation Science

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An effective high-speed countercurrent chromatography method was successfully established by using ionic liquids as the modifier of the two-phase solvent system. Adding a small amount of ionic liquids significantly shortens the separation time and improves the separation efficiency. The conditions of ionic-liquid-modified high-speed countercurrent chromatography including solvent systems, types and content of added ionic liquids, and ionic liquids posttreatment were investigated. The established method was successfully applied to separate alkaloids from lotus leaves using a two-phase solvent system composed of petroleum ether/ethyl acetate/methanol/water/[C mim][BF ] (1:5:1:5:0.15, v/v/v/v/v). Four alkaloids pronuciferine (1.7 mg), N-nornuciferine (4.3 mg), nuciferine (3.1 mg), and roemerine (2.1 mg) were obtained with the purities of 90.53, 92.25, 99.86, and 98.63%, respectively, from 100 mg crude extract of lotus leaves. The results indicated that the ionic-liquid-modified high-speed countercurrent chromatography method was suitable for alkaloid separation from lotus leaves and would be a promising method for the separation of alkaloids from other natural products.

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Imidazolium based ionic liquids as novel benign media for liquid-dye laser systems

Cited by 15 publications

References 33 publications

Spectroscopic and Photo-Physical Properties of Near-IR Laser Dye in Novel Benign Green Solvents

Spectroscopic and Photo-Physical Properties of Near-IR Laser Dye in Novel Benign Green Solvents

Dual-Emitting Ratiometric Luminescent Thermometers Based on Lanthanide Metal–Organic Complexes with Brønsted Acidic Ionic Liquids

Isolation and purification of alkaloids from lotus leaves by ionic‐liquid‐modified high‐speed countercurrent chromatography

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