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Related Concept Videos

NMR Spectroscopy of Benzene Derivatives01:34

NMR Spectroscopy of Benzene Derivatives

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Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling...
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Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

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According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
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Structure of Benzene: Kekulé Model01:07

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In 1865, August Kekule suggested the structure of benzene according to the structural theory of organic chemistry based on the three assertions—formula of benzene is C6H6, all the hydrogens of benzene are equivalent, and each carbon must have four bonds due to its tetravalency.
He proposed that benzene has a cyclic structure of six carbon atoms attached to one hydrogen atom each, with three alternating pi bonds.
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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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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π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

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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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Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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Simulating nonadiabatic dynamics in benzophenone: Tracing internal conversion through photoelectron spectra.

Lorenzo Restaino1, Thomas Schnappinger1, Markus Kowalewski1

  • 1Department of Physics, Stockholm University, Albanova University Centre, SE-106 91 Stockholm, Sweden.

The Journal of Chemical Physics
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Summary

Benzophenone

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Area of Science:

  • Photochemistry
  • Quantum Dynamics
  • Spectroscopy

Background:

  • Benzophenone is a model aromatic ketone.
  • Internal conversion in singlet states is poorly understood.
  • This process is crucial for understanding excited states.

Purpose of the Study:

  • Investigate internal conversion in benzophenone.
  • Clarify the role of singlet excited states.
  • Explore nonadiabatic relaxation mechanisms.

Main Methods:

  • Mixed quantum-classical dynamics simulations
  • Full quantum dynamics simulations
  • Time-resolved photoelectron spectroscopy
  • Gas-phase benzophenone and meta-methyl benzophenone

Main Results:

  • Nonadiabatic relaxation via conical intersections increases singlet excited state population.
  • Population increase is linear within 500 fs.
  • Photoelectron signal bifurcation indicates population transfer.
  • Role of the third singlet excited state is clarified.

Conclusions:

  • Conical intersections facilitate population transfer to the first singlet excited state.
  • Photoelectron spectroscopy can detect this nonadiabatic process.
  • This study sheds light on unexplored aspects of benzophenone photochemistry.