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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

5.0K
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.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
5.0K
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

1.9K
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
1.9K
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
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
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.6K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.6K
Emission Spectra02:39

Emission Spectra

76.9K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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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 Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

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Anharmonic vibrational effects in linear and two-dimensional electronic spectra.

Arpa Galestian Pour1, Craig Norman Lincoln, Václav Perlík

  • 1Photonics Institute, TU Wien, Gußhausstraße 27-29, 1040 Vienna, Austria. juergen.hauer@tuwien.ac.at.

Physical Chemistry Chemical Physics : PCCP
|September 5, 2017
PubMed
Summary

Vibrational anharmonicity in molecular electronic spectra can be quantified. New methods using peak ratios in absorption/emission and 2D electronic spectroscopy provide accurate measurements for complex molecules.

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Computational Chemistry

Background:

  • Harmonic vibration models are standard for electronic spectra but fail for larger organic molecules in solution.
  • Vibrational anharmonicity causes deviations from mirror symmetry in linear absorption and emission spectra.
  • Accurate quantification of anharmonicity is crucial for understanding molecular dynamics and electronic properties.

Purpose of the Study:

  • To develop and apply methods for quantifying vibrational anharmonicity in molecular electronic spectra.
  • To investigate anharmonic effects in perylene, terylene, and pinacyanol iodide.
  • To establish spectroscopic techniques suitable for both short-lived and long-lived excited states.

Main Methods:

  • Theoretical modeling introducing cubic anharmonicity into electronic potential energy surfaces.
  • Quantification via peak ratios of vibronic progressions in linear absorption and emission spectra.
  • Application of time-resolved two-dimensional electronic spectroscopy (2DES) for ultrafast dynamics.

Main Results:

  • A simple theoretical model successfully quantifies anharmonicity for perylene and terylene.
  • The peak ratio method is effective for molecules with longer-lived excited states.
  • 2DES provides a direct measure of vibrational anharmonicity for molecules with ultrafast excited-state dynamics, like pinacyanol iodide.

Conclusions:

  • Vibrational anharmonicity significantly impacts electronic spectra of organic molecules.
  • Peak ratio analysis in linear spectroscopy and 2DES cross-peak analysis are robust methods for anharmonicity quantification.
  • These spectroscopic techniques offer versatile tools for studying molecular vibrations and dynamics across different timescales.