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Related Concept Videos

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

1.3K
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
1.3K
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

1.7K
The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
1.7K
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

8.6K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in...
8.6K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

3.2K
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
3.2K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

4.0K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
4.0K
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

3.1K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
3.1K

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Updated: Feb 25, 2026

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

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Structure and Dynamics of Microhydrated Complexes Revealed with Rotational Spectroscopy.

Donatella Loru1, Wenhao Sun1, Eva Gougoula1

  • 1Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany;

Annual Review of Physical Chemistry
|February 23, 2026
PubMed
Summary
This summary is machine-generated.

Microhydration, the binding of water to solutes, alters water's hydrogen bonds and solute structures. Rotational spectroscopy and quantum calculations reveal dynamic changes and probe electronic environments during this process.

Keywords:
acid dissociationmicrohydrationnuclear quadrupole couplingrotational spectroscopywater tunneling

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Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Molecular Spectroscopy

Background:

  • Water's unique properties stem from its hydrogen bond networks.
  • Microhydration involves a few water molecules interacting with solutes, modifying both water's network and solute structure.

Purpose of the Study:

  • To investigate the structural dynamics and electronic changes in solute-water complexes during microhydration.
  • To demonstrate the utility of nuclear quadrupole coupling in probing microhydration effects.

Main Methods:

  • Utilized a combination of rotational spectroscopy and quantum-chemical calculations.
  • Employed nuclear quadrupole coupling to analyze changes in the electronic environment.

Main Results:

  • Observed significant internal dynamics and structural alterations in selected solute-water complexes upon microhydration.
  • Demonstrated that nuclear quadrupole coupling effectively probes electronic environment changes during microhydration.

Conclusions:

  • Microhydration significantly impacts solute-water interactions and molecular structures.
  • Rotational spectroscopy, quantum calculations, and nuclear quadrupole coupling provide powerful insights into microhydration phenomena and related chemical processes like acid dissociation.