Infrared and Terahertz Spectroscopic Investigation of Imidazolium, Pyridinium, and Tetraalkylammonium Tetrafluoroborate Ionic Liquids

Yamada, Toshiki; Mizuno, Maya

doi:10.1021/acsomega.2c02601

Cited by 7 publications

(4 citation statements)

References 61 publications

(157 reference statements)

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“…The pronounced absorption band around 1000 cm −1 in the experimental spectrum (Figure 5a) arises mainly from antisymmetric B−F stretching vibrations a4 of BF 4 − (Figure 5c). In pure EmimBF 4 , this band is characterized by a single primary peak with substructure, in good agreement with a previous IR study [36] . In the mixture, it broadens and develops a double‐peak structure with several minor peaks/shoulders.…”

Section: Dynamics and Spectroscopysupporting

confidence: 91%

Spectroscopic and Chemical Properties of Ionic Liquids: Computational Study

Kim

2023

The Chemical Record

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A brief account is given of highlights of our computational efforts – often in collaboration with experimental groups – to understand spectroscopic and chemical properties of ionic liquids (ILs). Molecular dynamics, including their inhomogeneous character, responsible for key spectral features observed in dielectric absorption, infra‐red (IR) and fluorescence correlation spectroscopy (FCS) measurements are elucidated. Mechanisms of chemical processes involving imidazolium‐based ILs are illustrated for CO2 capture and related reactions, transesterification of cellulose, and Au nanocluster‐catalyzed Suzuki cross‐coupling reaction with attention paid to differing roles of IL ions. A comparison with experiments is also made.

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Section: Dynamics and Spectroscopysupporting

confidence: 91%

Spectroscopic and Chemical Properties of Ionic Liquids: Computational Study

Kim

2023

The Chemical Record

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“…In the FTIR spectra of Cyanine 5.5, absorption bands at 1645 cm −1 and 1126 cm −1 correspond to characteristic carbonyl ester bonds C=O and C−N−C stretching, respectively. A small peak at 925 cm −1 was assignable to the [BF 4 − ] anion [36] . In order to promote the attached Cyanine 5.5, it is critical to functionalize the surface of Fe 3 O 4 NPs by inserting amine functional groups.…”

Section: Resultsmentioning

confidence: 99%

Near‐Infrared Emission‐Cyanine 5.5 and Doxorubicin Loaded Magnetite Nanoparticles for Dual In Vivo Magnetic Resonance and Biodistribution Imaging

Son Phan,

Thuy Doan,

Thu Huong Le

et al. 2023

ChemistrySelect

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The in vivo imaging of the drug distribution during cancer treatment plays an important role in helping physicians and pharmacists to monitor the progress of treatment and improve the effectiveness of therapy. Our goal in this work was to prepare a multifunctional nano drug delivery system that not only co‐loaded iron oxide nanoparticles (Fe3O4 NPs) and Doxorubicin (Dox) but also attached the near‐infrared fluorescent agent Cyanine 5.5 based on poly(lactide)‐tocopheryl polyethylene glycol 1000 succinate (PLA‐TPGS) copolymer. Cyanine 5.5 was attached to the surface Fe3O4 NPs via the NH−CO chemical bond, followed by co‐loading of Dox onto the PLA‐TPGS copolymer by the emulsion solvent evaporation method. The structural, morphological, dimensional, stability, and optical‐magnetic properties of the as‐synthesized nanosystem were fully characterized. From the drug‐released study, the prolonged release of Dox accelerated with increasing acidic conditions (at pH 5.0 and 6.5), while a slow release was observed at pH 7.4. Through the MTT assay, the nanosystem had cellular toxicity against Hep−G2 and HeLa cell lines with low IC50 values of 0.42 and 0.78 μg.mL−1 in terms of Dox concentration, respectively. At a magnetic field of 7 T, this nanosystem also exhibited a high r2/r1 ratio of 164.5 and a strong contrast magnetic resonance (MR) image in the liver. In vivo biodistribution studies revealed that the highest fluorescence intensity achived in the liver after 6 h, and the nanosystem was eliminated from the body after at least 24 h. Collectively, these results demonstrated that the PLA‐TPGS‐Fe3O4‐Cyanine 5.5‐Dox nanosystem is a good candidate for simultaneously increasing contrast for MR and near‐infrared fluorescence imaging.

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“…48 The bands characteristic of polypyrrole are less intense. The FTIR spectrum of PPy-PPyBF 4 (Figure 3B) shows an intense band at 1051 cm −1 attributed to the B−F stretching vibration that confirms the presence of BF 4 − anions, 49 the one of PPy-PPyPF 6 (Figure 3C) presents a very strong band at 936 cm −1 (ν as P−F), 50 and finally, for PPy-PPyTFSI (Figure 3D), new characteristic bands of TFSI at 1350 and 1132 cm −1 (ν as and ν s SO 2 ), at 1180 cm −1 (ν as CF 3 ), and at 615 cm −1 (δ a SO 2 ) 51 are present.…”

Section: Fourier Transform Infrared (Ftir) Spectroscopymentioning

confidence: 88%

Conductometric Sensor Based on Electropolymerized Pyrrole-Tailed Ionic Liquids for Acetone Detection

Ben Halima,

Madaci,

Contal

et al. 2024

ACS Appl. Polym. Mater.

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In the chemical industry and research institutes, acetone serves routinely as a solvent, a reactant, and an extractant. However, due to its high volatility and toxicity, monitoring its vapor concentration is of great necessity for health and industrial safety. Besides this, simple and easy-to-use portable sensors are still lacking. In this work, a conductometric transducer was developed for the detection of acetone vapor. For this, interdigitated electrodes were functionalized by electropolymerization of a series of N-(1-methyl-3octylimidazolium)pyrrole [PyC 8 MIm]X monomers that contain different counteranions X − , namely, hexafluorophosphate (PF 6 − ), tetrafluoroborate (BF 4 − ), and bis(trifluoromethylsulfonyl)imide (TFSI − ). The functionalized interdigitated electrodes were widely characterized. The analytical performances of the microsensors were determined in the presence of gaseous acetone, chloroform, ethanol, methanol, and toluene, collected from the headspace of the above aqueous solutions of known concentrations. The gas-sensing responses of the films were measured at room temperature through differential conductometric measurements conducted at 10 kHz. Among the different sensors, the one bearing BF 4 − anions presented the best analytical performances and was able to selectively detect acetone vapors. The sensor's response time (t res ) varied from 6 to 13 s from lower to higher concentrations. The detection limit was 0.76 v/v % (7600 ppm) in the gas phase. The relative standard deviation was 6% for lower concentrations and 2% for higher concentrations. The acetone sensor presented 2 times lower sensitivity for ethanol and 4 times lower sensitivity for methanol. Detection of acetone in the headspace of a nail varnish remover sample led to an acetone content that was in compliance with the value given by the producer.

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Infrared and Terahertz Spectroscopic Investigation of Imidazolium, Pyridinium, and Tetraalkylammonium Tetrafluoroborate Ionic Liquids

Cited by 7 publications

References 61 publications

Spectroscopic and Chemical Properties of Ionic Liquids: Computational Study

Spectroscopic and Chemical Properties of Ionic Liquids: Computational Study

Near‐Infrared Emission‐Cyanine 5.5 and Doxorubicin Loaded Magnetite Nanoparticles for Dual In Vivo Magnetic Resonance and Biodistribution Imaging

Conductometric Sensor Based on Electropolymerized Pyrrole-Tailed Ionic Liquids for Acetone Detection

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