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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...
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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.
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π Electron Effects on Chemical Shift: Overview01:27

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
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The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
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Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
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Optically Induced Charge Transfer in Organic Mixed-Valence Systems: Wave Packet Dynamics and Femtosecond Transient

F Glaab1, C Lambert2, V Engel1

  • 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Emil-Fischer-Strasse 42, 97074 Würzburg, Germany.

The Journal of Physical Chemistry. A
|May 7, 2021
PubMed
Summary
This summary is machine-generated.

Femtosecond laser pulses drive charge transfer in organic molecules. Relaxation dynamics, not just transfer, are key, requiring advanced analysis methods for accurate spectral interpretation.

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Area of Science:

  • Physical Chemistry
  • Theoretical Chemistry
  • Spectroscopy

Background:

  • Understanding charge transfer dynamics is crucial for designing advanced molecular materials.
  • Organic mixed-valence molecules offer tunable electronic properties for charge transport applications.

Purpose of the Study:

  • To theoretically investigate the dynamics of charge transfer in organic mixed-valence molecules.
  • To analyze the influence of molecular structure on charge transfer pathways.
  • To compare theoretical predictions with experimental linear and transient absorption spectra.

Main Methods:

  • Theoretical modeling of coupled electronic states in bridged organic molecules.
  • Calculation of linear absorption spectra.
  • Simulation of wave packet dynamics along two reaction coordinates.
  • Determination of transient absorption spectra via directional decomposition of time-dependent polarization.

Main Results:

  • Charge transfer dynamics are significantly influenced by relaxation processes.
  • Differences in bridge energetical position affect spectral properties.
  • Theoretical spectra show good agreement with experimental data.
  • Coupled dynamics necessitate advanced decomposition techniques for spectral analysis.

Conclusions:

  • Relaxation plays a dominant role in femtosecond laser-induced charge transfer.
  • Existing spectral decomposition methods may require extensions for complex coupled systems.
  • Theoretical insights aid in interpreting experimental observations of charge transfer.