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Related Concept Videos

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...
Covalent Bonding and Lewis Structures02:46

Covalent Bonding and Lewis Structures

Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
Nuclear Fusion02:45

Nuclear Fusion

The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
Radical Formation: Homolysis00:54

Radical Formation: Homolysis

A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
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...

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Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes
10:04

Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes

Published on: May 26, 2014

Does ammonia hydrogen bond?

D D Nelson, G T Fraser, W Klemperer

    Science (New York, N.Y.)
    |December 18, 1987
    PubMed
    Summary
    This summary is machine-generated.

    Spectroscopic studies reveal ammonia (NH(3)) is a strong hydrogen bond acceptor but shows little evidence of acting as a proton donor. This challenges previous assumptions about NH(3) interactions.

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    Area of Science:

    • Chemical Spectroscopy
    • Molecular Interactions
    • Physical Chemistry

    Background:

    • Ammonia (NH(3)) is a fundamental molecule in chemistry.
    • Previous research has explored its role in hydrogen bonding.
    • Understanding NH(3)'s interaction mechanisms is crucial for various chemical processes.

    Purpose of the Study:

    • To spectroscopically characterize the stereochemistry of ammonia complexes.
    • To investigate the proton donor and acceptor capabilities of ammonia in hydrogen bonding.
    • To reconcile existing theories with new experimental findings on NH(3) interactions.

    Main Methods:

    • Utilized advanced spectroscopic techniques to analyze ammonia complexes.
    • Examined the stereochemical outcomes of interactions involving NH(3).
    • Critically evaluated existing literature on condensed-phase and gas-phase observations.

    Main Results:

    • Confirmed ammonia's role as a near-universal proton acceptor.
    • Observed hydrogen bonding from even weak proton donors to NH(3).
    • Found no spectroscopic evidence supporting NH(3) as a proton donor in hydrogen bonds.

    Conclusions:

    • Ammonia (NH(3)) functions effectively as a potent hydrogen bond acceptor.
    • The propensity of NH(3) to donate hydrogen bonds appears minimal.
    • Experimental data challenges long-held views on NH(3)'s dual role in hydrogen bonding.