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Pore Transport and Ion-Pair Transport01:17

Pore Transport and Ion-Pair Transport

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
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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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Micelles

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Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
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Ionic Association

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The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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Proton transfer in ionic and neutral reverse micelles.

Christian Lawler1, Michael D Fayer1

  • 1Department of Chemistry, Stanford University, Stanford, California 94305, United States.

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Proton transfer and molecular motion were studied in ionic and neutral reverse micelles using fluorescent probes. Results show probe location differs between micelle types, impacting proton transfer kinetics and orientational dynamics compared to bulk water.

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Area of Science:

  • Physical Chemistry
  • Supramolecular Chemistry
  • Photochemistry

Background:

  • Reverse micelles are water-in-oil microemulsions with unique solvation properties.
  • Understanding molecular behavior within reverse micelles is crucial for various applications, including drug delivery and catalysis.
  • Proton transfer kinetics and orientational dynamics are key parameters to probe microenvironment characteristics.

Purpose of the Study:

  • To investigate proton-transfer kinetics of 8-hydroxypyrene-1,3,6-trisulfonate (HPTS) in ionic and neutral reverse micelles.
  • To study the orientational dynamics of methoxy-HPTS (MPTS) in the water pools of these reverse micelles.
  • To compare the observed kinetics and dynamics with those in bulk water to understand the influence of the micellar environment.

Main Methods:

  • Time-correlated single-photon counting (TCSPC) for fluorescence lifetime and proton transfer studies.
  • Time-dependent fluorescence anisotropy measurements for orientational dynamics.
  • Utilized fluorescent probes HPTS and its derivative MPTS.
  • Experiments conducted in ionic (Aerosol OT) and neutral (Igepal CO-520) reverse micelles, and in bulk water.

Main Results:

  • In ionic reverse micelles, MPTS showed unhindered orientational motion, suggesting location in the water core.
  • In neutral reverse micelles, MPTS exhibited slow, multiexponential anisotropy decay, indicating location at the water-surfactant interface.
  • HPTS proton transfer in ionic micelles was slower than in bulk water but followed similar power-law behavior, suggesting modified diffusion control.
  • Proton transfer in neutral micelles did not show power-law behavior and indicated distinct water-like and less water-like probe populations.

Conclusions:

  • The location of the probe molecule (MPTS) within reverse micelles significantly influences its orientational dynamics and the observed proton transfer kinetics.
  • Ionic reverse micelles offer a more water-like environment for probes compared to neutral reverse micelles, where probes interact closely with the interface.
  • Deviations from theoretical predictions and previous experimental results for proton transfer in bulk water warrant further investigation.