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Related Concept Videos

Hydrogen Bonds01:04

Hydrogen Bonds

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...
Hydrogen Bonds00:26

Hydrogen Bonds

Hydrogen BondsHydrogen 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...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

sp3d and sp3d 2 Hybridization
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...

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In Situ High Pressure Hydrogen Tribological Testing of Common Polymer Materials Used in the Hydrogen Delivery Infrastructure
10:01

In Situ High Pressure Hydrogen Tribological Testing of Common Polymer Materials Used in the Hydrogen Delivery Infrastructure

Published on: March 31, 2018

Novel pressure-induced interactions in silane-hydrogen.

Timothy A Strobel1, Maddury Somayazulu, Russell J Hemley

  • 1Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20015, USA. tstrobel@ciw.edu

Physical Review Letters
|October 2, 2009
PubMed
Summary

Novel compounds formed from silane and hydrogen reveal unprecedented intermolecular interactions in hydrogen-rich solids. This discovery opens new avenues for exploring pressure-driven interactions and modifying hydrogen bonds.

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Last Updated: Jun 19, 2026

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Published on: May 1, 2012

Area of Science:

  • Materials Science
  • High-Pressure Physics
  • Quantum Chemistry

Background:

  • Hydrogen-rich solids are typically studied under extreme pressures.
  • Understanding intermolecular interactions is key to designing novel materials.
  • Previous research has not observed such low-pressure phenomena in similar systems.

Purpose of the Study:

  • To investigate the formation of novel molecular compounds from silane-hydrogen mixtures.
  • To characterize the intermolecular interactions and bond dynamics under pressure.
  • To explore new pressure-driven interactions in simple molecular systems.

Main Methods:

  • High-pressure synthesis and characterization of silane-hydrogen mixtures.
  • Analysis of H2 vibron spectra to determine pressure-frequency dependencies.
  • Hydrogen-deuterium (H-D) exchange experiments to probe molecular interactions.

Main Results:

  • Formation of a novel SiH4(H2)2 compound with unprecedented intermolecular interactions.
  • Observation of a complex H2 vibron spectrum with anticorrelated pressure-frequency dependencies.
  • Evidence of molecular bond destabilization and strong attractive interactions at pressures below 10 GPa.

Conclusions:

  • The SiH4(H2)2 compound exhibits unique features suggesting a new class of pressure-driven intermolecular interactions.
  • This work demonstrates a novel approach to perturbing hydrogen covalent bonds using pressure.
  • Findings expand the understanding of hydrogen-bearing simple molecular systems under pressure.