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Related Concept Videos

NMR Spectroscopy of Aromatic Compounds01:14

NMR Spectroscopy of Aromatic Compounds

Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range. Consider...
IR Spectroscopy: Molecular Vibration Overview01:24

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
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π Molecular Orbitals of 1,3-Butadiene01:24

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IR Spectrum01:19

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Related Experiment Video

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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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Vibrational spectrum of solid picene (C22H14).

B Joseph1, L Boeri, L Malavasi

  • 1Dipartimento di Fisica, Università di Roma Sapienza, Piazzale Aldo Moro 2, 00185 Roma, Italy.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 29, 2012
PubMed
Summary
This summary is machine-generated.

Superconductivity in potassium-doped picene (C(22)H(14)) is linked to electron-phonon coupling. This study assigns vibrational modes in picene, identifying those crucial for superconductivity in doped materials.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Organic Chemistry

Background:

  • Superconductivity was recently observed in potassium-doped picene, a polycyclic aromatic hydrocarbon.
  • Electron-phonon coupling is theoretically implicated in the superconducting mechanism of these organic compounds.

Purpose of the Study:

  • To experimentally and theoretically assign vibrational modes in undoped solid picene.
  • To identify specific vibrational modes strongly coupled to electrons, potentially mediating superconductivity.

Main Methods:

  • Combined experimental (Raman and infrared spectroscopy) and ab initio calculations.
  • Vibrational mode analysis of undoped picene.

Main Results:

  • Unambiguous assignment of Raman and infrared vibrational modes for solid picene.
  • Identification of specific modes with strong electron-phonon coupling potential.

Conclusions:

  • The identified vibrational modes are critical for understanding superconductivity in doped picene.
  • This work provides a foundation for designing future organic superconductors based on vibrational properties.