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Related Concept Videos

Hydrogen Bonds01:04

Hydrogen Bonds

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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...
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Hydrogen Bonds00:26

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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....
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Hybridization of Atomic Orbitals I03:24

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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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Inductive Effects on Chemical Shift: Overview01:27

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The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
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Hybridization of Atomic Orbitals II

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sp3d and sp3d 2 Hybridization
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Conformations of Ethane and Propane02:18

Conformations of Ethane and Propane

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In an organic molecule, free rotation about the carbon-carbon single bond results in energetically different conformers of the molecule. Due to this rotation, called the internal rotation, ethane has two major conformations — staggered and eclipsed.
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Methane Hydrate Crystallization on Sessile Water Droplets
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Effective Binding of Methane Using a Weak Hydrogen Bond.

Alice Henley1, Michelle Bound1, Elena Besley1

  • 1School of Chemistry, University of Nottingham , University Park, Nottingham NG7 2RD, U.K.

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|May 6, 2016
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Summary

Researchers explored weak hydrogen bonds for methane capture. Benzenesulfonic acid and phenylphosphonic acid show the greatest potential for binding methane molecules efficiently through these interactions.

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Area of Science:

  • Chemical Physics
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Weak hydrogen bonds are crucial noncovalent interactions in various chemical and biological systems.
  • These interactions influence protein stability, molecular recognition, and gas storage in porous materials.

Purpose of the Study:

  • To systematically investigate methane interactions with functionalized organic molecules designed for weak hydrogen bonding.
  • To identify molecules with enhanced hydrogen bond strength for methane capture.

Main Methods:

  • Computational study using second-order Møller-Plesset perturbation theory.
  • Analysis of binding interactions between methane and nine functionalized benzene molecules.
  • Examination of atomic charge distribution at binding sites.

Main Results:

  • Benzenesulfonic acid (C6H5-SO3H) and phenylphosphonic acid (C6H5-PO3H2) demonstrated the strongest hydrogen bonding potential with methane.
  • These two molecules showed efficient binding capabilities for up to three methane molecules each.
  • Functional groups were selected to enhance methane C-H bond polarization for stronger interactions.

Conclusions:

  • Benzenesulfonic acid and phenylphosphonic acid are promising candidates for efficient methane capture via weak hydrogen bonding.
  • The study provides insights into designing materials for selective gas adsorption based on hydrogen bond interactions.