Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Hydrogen Bonds01:04

Hydrogen Bonds

15.9K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
15.9K
Hydrogen Bonds00:26

Hydrogen Bonds

136.1K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
136.1K
IR Spectrum Peak Broadening: Hydrogen Bonding01:23

IR Spectrum Peak Broadening: Hydrogen Bonding

2.1K
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...
2.1K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

2.1K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
2.1K
Valence Bond Theory02:45

Valence Bond Theory

51.3K
Overview of Valence Bond Theory
51.3K
Valence Bond Theory02:42

Valence Bond Theory

11.6K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.6K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Locating Cytosine Conical Intersections by Laser Experiments and <i>Ab Initio</i> Calculations.

The journal of physical chemistry letters·2020
Same author

Intermolecular dissociation energies of 1-naphthol complexes with large dispersion-energy donors: Decalins and adamantane.

The Journal of chemical physics·2020
Same author

Benchmark Experimental Gas-Phase Intermolecular Dissociation Energies by the SEP-R2PI Method.

Annual review of physical chemistry·2020
Same author

Excited-state vibrations, lifetimes, and nonradiative dynamics of jet-cooled 1-ethylcytosine.

The Journal of chemical physics·2019
Same author

Face, Notch, or Edge? Intermolecular dissociation energies of 1-naphthol complexes with linear molecules.

The Journal of chemical physics·2019
Same author

Intermolecular dissociation energies of hydrogen-bonded 1-naphthol complexes.

The Journal of chemical physics·2018

Related Experiment Video

Updated: Mar 21, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
08:04

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

Published on: May 27, 2020

9.1K

Do Hydrogen Bonds Influence Excitonic Splittings?

Franziska A Balmer1, Philipp Ottiger2, Samuel Leutwyler3

  • 1Universität Bern, Departement für Chemie und Biochemie, Freiestrasse 3, CH-3012 Bern, Switzerland.

Chimia
|May 1, 2016
PubMed
Summary

Investigating benzonitrile (BN)2 and meta-cyanophenol (mCP)2 dimers reveals that while hydrogen bonds significantly shift spectra, they minimally impact excitonic splitting. Stronger OH···N≡C bonds in (mCP)2 lead to greater vibronic quenching compared to (BN)2.

More Related Videos

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

69.8K
Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry
11:37

Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry

Published on: November 29, 2013

19.1K

Related Experiment Videos

Last Updated: Mar 21, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
08:04

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

Published on: May 27, 2020

9.1K
From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

69.8K
Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry
11:37

Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry

Published on: November 29, 2013

19.1K

Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Molecular Interactions

Background:

  • Investigating excitonic splitting and vibronic quenching in molecular dimers.
  • Understanding the influence of hydrogen bond strength on electronic transitions.

Purpose of the Study:

  • To compare excitonic splitting and vibronic quenching in benzonitrile (BN)2 and meta-cyanophenol (mCP)2 dimers.
  • To elucidate the role of hydrogen bond strength (CH···N≡C vs. OH···N≡C) in these phenomena.

Main Methods:

  • Two-color resonant two-photon ionization spectroscopy.
  • Utilizing (13)C-substituted heterodimer isotopomers to break centrosymmetry.
  • Comparing experimental spectra with ab initio calculations.

Main Results:

  • Excitonic splittings determined as Δexc = 2.1 cm(-1) for (BN)2 and Δexc = 7.3 cm(-1) for (mCP)2.
  • Significant vibronic quenching observed in (mCP)2 (Δcalc = 179 cm-1) compared to (BN)2 (Δcalc = 10 cm-1).
  • Experimental data confirms OH···N≡C bonds are substantially stronger than CH···N≡C bonds.

Conclusions:

  • Hydrogen bonds strongly influence spectral shifts but have minimal effect on excitonic splitting.
  • Vibronic quenching is significantly enhanced by stronger hydrogen bonds.
  • The study provides insights into the interplay between hydrogen bonding and electronic properties in molecular dimers.