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Related Concept Videos

Solvating Effects02:12

Solvating Effects

An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
Acidity and Basicity of Carboxylic Acid Derivatives01:25

Acidity and Basicity of Carboxylic Acid Derivatives

Carboxylic acids are the strongest among organic acids, as they readily lose the hydroxyl proton to form a resonance-stabilized carboxylate ion. In comparison, the acid derivatives lack acidic hydrogens directly attached to a functional group. In these compounds, the acidic nature arises from their ability to lose α hydrogens, making them weakly acidic.
The relative acidic strength of the derivatives can be explained based on the extent of resonance stabilization of the conjugate base. The...
Physical Properties of Carboxylic Acid Derivatives01:19

Physical Properties of Carboxylic Acid Derivatives

Intermolecular forces dictate several physical properties such as boiling points, melting points, solubilities, and so forth. They are classified into four types: ionic forces, hydrogen bonds, dipole–dipole forces, and dispersion forces. Ionic forces are the strongest, while dispersion forces are the weakest.
Among the carboxylic acid derivatives, the boiling points of acid chlorides and esters are very similar and are the lowest in the series. Acid anhydrides have slightly higher boiling...
Substituent Effects on Acidity of Carboxylic Acids01:31

Substituent Effects on Acidity of Carboxylic Acids

The acidity of carboxylic acids is influenced by the nature of the substituents bounded to the functional group. The acid strength is determined by the stability of the carboxylate anion—the conjugate base formed by dissociating the corresponding carboxylic acid.
Molecular Structure and Acidity02:34

Molecular Structure and Acidity

An acid can be deprotonated to form a conjugate base or an anion. If the produced anion is more stable, then the acid is stronger. On the contrary, if the anion is unstable, then the acid is weaker. Hence, to determine the acidity of the compound, the stability of its conjugate base is studied using various factors.
The size effect explains the change in atomic size on acidity. When comparing the acids formed from elements that belong to the same column in the periodic table, their atomic sizes...
Leveling Effect01:29

Leveling Effect

In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the solvent...

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Related Experiment Video

Updated: May 13, 2026

Transport Properties of Ibuprofen Encapsulated in Cyclodextrin Nanosponge Hydrogels: A Proton HR-MAS NMR Spectroscopy Study
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Transport Properties of Ibuprofen Encapsulated in Cyclodextrin Nanosponge Hydrogels: A Proton HR-MAS NMR Spectroscopy Study

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Local solvent acidities in β-cyclodextrin complexes with PRODAN derivatives.

Hannah R Naughton1, Christopher J Abelt

  • 1Department of Chemistry, College of William and Mary, Williamsburg, Virginia 23185, USA.

The Journal of Physical Chemistry. B
|March 12, 2013
PubMed
Summary
This summary is machine-generated.

PRODAN derivatives in beta-cyclodextrin complexes act as dual sensors. Their acidity and polarity reveal whether the carbonyl group is exposed or shielded within the complex.

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Transport Properties of Ibuprofen Encapsulated in Cyclodextrin Nanosponge Hydrogels: A Proton HR-MAS NMR Spectroscopy Study
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Area of Science:

  • Supramolecular Chemistry
  • Analytical Chemistry
  • Physical Chemistry

Background:

  • Beta-cyclodextrin (β-CD) is a host molecule used in supramolecular chemistry to encapsulate guest molecules.
  • PRODAN derivatives are fluorescent probes sensitive to their local microenvironment.
  • Understanding host-guest interactions is crucial for designing new materials and drug delivery systems.

Purpose of the Study:

  • To determine the local solvent acidity (SA) and polarity (E(T)(N)) of six 6-carbonyl-2-aminonaphthalene derivatives within β-cyclodextrin complexes.
  • To investigate the structural implications of host-guest interactions using fluorescence spectroscopy.
  • To assess the utility of PRODAN derivatives as dual-channel sensors for local environments.

Main Methods:

  • Fluorescence quenching was used to determine the local solvent acidity (SA scale).
  • The shift in the emission center-of-mass was employed to determine local polarities (E(T)(N) scale).
  • Analysis of apparent SA and E(T)(N) values provided insights into the host-guest complex structures.

Main Results:

  • Apparent SA values indicated the solvent structure around the guest's carbonyl group.
  • Apparent E(T)(N) values reflected the overall polarity of the guest molecule.
  • Derivatives 1 and 5 exhibited high acidity, suggesting exposed carbonyl groups.
  • Other derivatives showed lower acidity, indicating shielded carbonyl groups.

Conclusions:

  • PRODAN derivatives function as effective dual-channel sensors of their local environment within β-CD complexes.
  • The combined SA and E(T)(N) measurements provide detailed structural information about host-guest interactions.
  • The study highlights the sensitivity of PRODAN probes to subtle changes in the microenvironment.