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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

1.8K
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...
1.8K
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

6.7K
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...
6.7K
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

781
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...
781
IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

680
Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
680
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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

1.0K
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.
1.0K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

1.1K
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...
1.1K

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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Modulating vibrational energy redistribution in highly conjugated systems.

Majid Hassani1, Pathick Halder Shaon1, Christopher J Mallon1

  • 1Department of Chemistry, University of Nevada, Reno, Reno, Nevada 89557, USA.

The Journal of Chemical Physics
|April 16, 2025
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Summary
This summary is machine-generated.

Understanding intramolecular vibrational energy redistribution (IVR) guides molecular wire design. Two-dimensional infrared spectroscopy reveals how molecular structure controls energy flow, enabling tailored electronic properties.

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Intramolecular vibrational energy redistribution (IVR) is crucial for designing molecular wires.
  • Controlling IVR requires a mechanistic understanding of energy transfer pathways.
  • Aromatic scaffolds are key components in conjugated molecular systems.

Purpose of the Study:

  • To assess the ability to steer intramolecular vibrational energy redistribution (IVR) through mechanistic understanding.
  • To investigate energy transfer timescales in three distinct aromatic molecular scaffolds using 2D IR spectroscopy.
  • To elucidate the role of structural features in directing energy flow for molecular electronics applications.

Main Methods:

  • Utilized two-dimensional infrared (2D IR) spectroscopy to probe energy transfer dynamics.
  • Investigated three aromatic molecular scaffolds: 4'-azido-[1,1'-biphenyl]-4-carbonitrile (PAB), 2'-azido-[1,1'-biphenyl]-4-carbonitrile (OAB), and 4'-(azidomethyl)-[1,1'-biphenyl]-4-carbonitrile (PAMB).
  • Analyzed energy transfer pathways between azido (N3) and cyano (CN) vibrational reporters.

Main Results:

  • PAB exhibited the fastest energy transfer (22 ps) due to its co-planar structure and strong π-π stacking.
  • OAB showed a moderate IVR timescale (38 ps) influenced by an orthogonal molecular plane and steric hindrance.
  • PAMB displayed the slowest energy transfer (84 ps) due to a structural bottleneck introduced by a para-methylene group.

Conclusions:

  • IVR rates are dictated by anharmonic coupling, vibrational mode alignment, and delocalization within aromatic scaffolds.
  • Structural modifications, including steric constraints and π-π interactions, can effectively tailor energy flow.
  • Findings provide a framework for designing conjugated molecular systems with controlled energy transfer for molecular electronics.