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A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Unexpected organic hydrate luminogens in the solid state.

Feng Zhou1, Peiyang Gu1, Zhipu Luo2

  • 1College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu, 215123, China.

Nature Communications
|April 21, 2021
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Summary
This summary is machine-generated.

Water molecules enhance the solid-state fluorescence of organic luminogens by forming hydrates. This discovery offers new methods for detecting deuterium oxide (D2O) through isotope effects.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Developing efficient solid-state organic photoluminescent materials is crucial for practical applications.
  • Tautomerizable Schiff-base molecules often exhibit hindered emission due to intramolecular hydrogen bonds.

Purpose of the Study:

  • To investigate the effect of water on the photoluminescent properties of Schiff-base molecules.
  • To explore the mechanism of fluorescence enhancement in the presence of water and deuterium oxide.

Main Methods:

  • Synthesis of three tautomerizable Schiff-base molecules.
  • Crystallization and characterization of organic hydrates.
  • Spectroscopic analysis of photoluminescence properties in solid state and in the presence of water/D2O.

Main Results:

  • Water intercalation into crystal lattices forms organic hydrate luminogens, significantly enhancing fluorescence.
  • Water molecules suppress proton shuttling, altering excited-state electronic transitions from nπ* to ππ* in the keto form.
  • Deuterium oxide (D2O) further enhances keto-state emission via isotope effects.

Conclusions:

  • Water molecules can act as structural and electronic modulators to improve photoluminescence in organic materials.
  • The observed D2O-induced emission enhancement provides a novel approach for D2O detection and quantification.