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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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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...
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IR Spectrum Peak Broadening: Hydrogen Bonding01:23

IR Spectrum Peak Broadening: Hydrogen Bonding

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The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular...
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

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

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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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...
1.2K
Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

4.2K
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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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
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Inter- and Intramolecular Vibrational Energy Flow in a Formamide-Water Complex.

H K Shin1

  • 1Department of Chemistry, University of Nevada, Reno, Nevada 89557, United States.

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|April 2, 2020
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Hydrogen bonds facilitate rapid energy transfer within formamide-water complexes. This vibrational energy redistribution occurs via strong coupling, enabling ultrafast relaxation and energy flow through hydrogen bonds.

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Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Molecular Dynamics

Background:

  • Understanding energy transfer in molecular complexes is crucial for chemical reactions and material properties.
  • Formamide-water complexes are relevant models for studying hydrogen bonding and solvation effects.

Purpose of the Study:

  • To investigate the role of hydrogen bonds in vibrational energy redistribution within a formamide-water complex.
  • To elucidate the mechanisms and timescales of energy transfer processes.

Main Methods:

  • Utilized semiclassical formulations to calculate energy transfer probabilities.
  • Solved equations of motion to model the dynamics of the complex.
  • Analyzed vibrational energy flow from OH stretching to bending overtones.

Main Results:

  • Demonstrated highly efficient, near-resonant vibrational energy transfer from OH stretching to the bending overtone.
  • Observed ultrafast energy redistribution (approximately 100 fs) into accepting modes.
  • Identified strong coupling between OH bending and low-frequency intermolecular modes as key to rapid relaxation.

Conclusions:

  • Hydrogen bonds play a critical role in mediating ultrafast energy redistribution in formamide-water complexes.
  • Energy transfer is efficiently channeled through intermolecular hydrogen bonds, impacting distant functional groups.
  • The study provides insights into fundamental energy dynamics in hydrogen-bonded systems.