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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
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An Optimized Protocol for Electrophoretic Mobility Shift Assay Using Infrared Fluorescent Dye-labeled Oligonucleotides
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Large Stokes Shift Ionic-Liquid Dye.

Stella Schmode1, Andranik Petrosyan1, Franziska Fennel2

  • 1Institut für Chemie, Abteilung für Physikalische Chemie, Universität Rostock, Dr.-Lorenz-Weg 2, 18059, Rostock, Germany.

Angewandte Chemie (International Ed. in English)
|May 31, 2017
PubMed
Summary

We synthesized a novel ionic liquid dye, [6MQc][NTf2], by incorporating N-methyl-6-oxyquinolone. This photoacidic dye exhibits significant solvatochromism and a large Stokes shift, making it useful for sensing applications.

Keywords:
fluorescent probeionic liquidsphotochemistrysolvation chemistryspectroscopy

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Area of Science:

  • Materials Chemistry
  • Photochemistry
  • Supramolecular Chemistry

Background:

  • Ionic liquids (ILs) offer unique tunable properties for advanced materials.
  • Developing novel dyes with tailored photophysical properties is crucial for various applications.
  • Photoacidic molecules can undergo proton transfer upon photoexcitation, enabling responsive systems.

Purpose of the Study:

  • To synthesize and characterize a new ionic liquid dye incorporating a photoacidic moiety.
  • To investigate the photophysical properties, including fluorescence and solvatochromism, of the synthesized IL dye.
  • To explore the potential of the IL dye as a photoacid in different solvent environments.

Main Methods:

  • Synthesis of N-methyl-6-hydroxyquinolinium bis(trifluoromethylsulfonyl) imide ([6MQc][NTf2]) ionic liquid dye.
  • Characterization using NMR, ATR IR spectroscopy, and X-ray crystallography.
  • Photophysical measurements including fluorescence spectroscopy in various solvents.

Main Results:

  • The synthesized IL dye [6MQc][NTf2] was successfully prepared and structurally confirmed.
  • The dye exhibits a large Stokes shift (116 nm) and a fluorescence quantum yield of 0.56 in acetonitrile.
  • Significant bathochromic shifts (up to 28 nm) and red-shifts to 650 nm were observed in polar solvents due to excited-state proton transfer.

Conclusions:

  • The ionic liquid dye [6MQc][NTf2] demonstrates tunable photophysical properties influenced by solvent polarity.
  • The observed excited-state proton transfer highlights the photoacidic nature of the [MQc]+ cation.
  • This IL dye holds promise for applications requiring photoresponsive and solvatochromic materials.