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Related Concept Videos

Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
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Sound Waves: Resonance01:14

Sound Waves: Resonance

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Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

2.7K
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 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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Resonance02:52

Resonance

64.4K
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
64.4K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Related Experiment Video

Updated: Jan 15, 2026

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
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Resonance Response to Intermolecular Interaction: A Natural Resonance Theory Analysis.

Jakub Brzeski1,2

  • 1Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|October 16, 2025
PubMed
Summary
This summary is machine-generated.

Supramolecular stabilization significantly alters molecular resonance structures. Water complexation can change resonance by up to 32% and introduce new resonance patterns, impacting chemical predictions.

Keywords:
hydrogen bondsinteraction region indicatornoncovalent interactionsresonancesymmetry adapted perturbation theory

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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Area of Science:

  • Computational Chemistry
  • Supramolecular Chemistry
  • Organic Chemistry

Background:

  • Resonance is a fundamental concept in organic chemistry.
  • The influence of supramolecular stabilization on resonance is not well understood.
  • Exploring resonance modulation enhances understanding of molecular behavior.

Purpose of the Study:

  • To investigate how supramolecular stabilization affects resonance.
  • To quantify the impact of noncovalent interactions on resonance structures.
  • To explore the participation of water molecules in resonance.

Main Methods:

  • Natural Resonance Theory (NRT)
  • Ab initio computational methods (DF-MP2, coupled-cluster singles and doubles, SAPT2+3(CCD)δMP2)
  • Interaction Region Indicator (IRI)
  • Charge-transfer analysis

Main Results:

  • Complexation with water can alter the relative weights of resonance structures by up to 32%.
  • New resonance structures emerge in X/H2O complexes, involving water's outer-valence electrons.
  • Supramolecular interactions significantly influence the electronic distribution and resonance patterns.

Conclusions:

  • Supramolecular stabilization is a critical factor in modulating molecular resonance.
  • This study provides a deeper understanding of resonance in noncovalently bonded systems.
  • Findings can improve predictions of molecular behavior in complex chemical environments.