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The free energy change associated with dissolving a solute in a liter of solvent is called the free energy of a solution, ΔGsolution. The overall ΔGsolution is expressed as the balance of ΔGinteraction against the always-favorable free-energy of mixing, ΔGmixing. Solution formation is favorable if  ΔGsolution is less than zero, whereas it is unfavorable if ΔGsolution is greater than zero. In short, for a solution to form and complete dissolution to take place,...
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Solubility equilibria are established when the dissolution and precipitation of a solute species occur at equal rates. These equilibria underlie many natural and technological processes, ranging from tooth decay to water purification. An understanding of the factors affecting compound solubility is, therefore, essential to the effective management of these processes. This section applies previously introduced equilibrium concepts and tools to systems involving dissolution and precipitation.
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Highly Solvatochromic 7-Aryl-3-hydroxychromones.

Luciana Giordano1, Volodymyr V Shvadchak1, Jonathan A Fauerbach2

  • 1†Laboratory for Cellular Dynamics, Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, Göttingen, Germany.

The Journal of Physical Chemistry Letters
|August 20, 2015
PubMed
Summary
This summary is machine-generated.

Introducing a dialkylaminophenyl group in 3-hydroxychromone probes enhances solvatochromic properties and fluorescence. Methylation improves photostability, enabling sensitive membrane analysis.

Keywords:
ESIPTProdanenvironment-sensitivefluorescenceliposomesprobe

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Area of Science:

  • Organic Chemistry
  • Photophysics
  • Biophysical Chemistry

Background:

  • 3-hydroxychromone derivatives are known for their fluorescent properties.
  • Solvatochromism and excited-state intramolecular proton transfer (ESIPT) are key photophysical phenomena.
  • Understanding molecular probes for membrane analysis is crucial in biophysics.

Purpose of the Study:

  • To investigate the effect of introducing a dialkylaminophenyl group at position 7 of 3-hydroxychromone on its photophysical properties.
  • To explore the role of excited-state intramolecular proton transfer (ESIPT) and its inhibition.
  • To evaluate the potential of these modified chromones as fluorescent probes for biological membranes.

Main Methods:

  • Synthesis of 7-aryl-3-hydroxychromone derivatives with dialkylaminophenyl groups.
  • Spectroscopic analysis (absorption and emission) in various solvents to determine solvatochromic shifts.
  • Methylation of the 3-hydroxyl group to study its effect on ESIPT and photostability.
  • Fluorescence measurements upon interaction with model membrane systems.

Main Results:

  • Introduction of the dialkylaminophenyl group significantly altered the excited-state dipole moment, leading to superior solvatochromic properties with emission shifts over 170 nm.
  • The excited-state intramolecular proton-transfer (ESIPT) reaction was largely inhibited in most solvents.
  • Methylation of the 3-OH group completely abolished ESIPT and enhanced photostability.
  • Probes showed a ~100-fold increase in fluorescence intensity and large Stokes shifts upon membrane binding, with emission band shifts >40 nm indicating sensitivity to membrane phase and charge.

Conclusions:

  • Modified 3-hydroxychromones with specific substituents exhibit tunable and enhanced photophysical properties.
  • Inhibition of ESIPT and improved photostability are achievable through structural modifications.
  • These compounds serve as effective fluorescent probes for detecting membrane characteristics, offering a new tool for biophysical studies.