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Related Concept Videos

Hydrogen Bonds00:26

Hydrogen Bonds

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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.
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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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Hydrogen Bonds01:04

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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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Dissociative Disorders01:27

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Dissociative disorders represent complex psychological conditions characterized by disruptions in consciousness, memory, identity, or perception. These disruptions cause individuals to experience a disconnection from their thoughts, emotions, and memories. The phenomenon is not merely an occasional lapse in attention but a profound alteration in mental functioning that can severely impact daily life.
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Dissociative Amnesia01:21

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Dissociative Identity Disorder (DID), previously termed multiple personality disorder, is a complex psychological condition characterized by the presence of two or more distinct identities or personality states. Each identity exhibits unique patterns of behavior, voice, and mannerisms and may possess separate memories and emotional responses. The alternating control between identities can result in memory gaps and challenges in recalling daily activities, often exacerbating the individual's...
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Reduction of Alkenes: Catalytic Hydrogenation02:13

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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Nonadiabatic Hydrogen Dissociation on Copper Nanoclusters.

Robert A Hoyt1, Matthew M Montemore2, Efthimios Kaxiras1,2

  • 1Department of Physics , Harvard University , Cambridge , Massachusetts 02138 , United States.

The Journal of Physical Chemistry Letters
|August 28, 2018
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Summary

Copper nanoclusters show magnetism-dependent catalysis for hydrogen dissociation. Controlling magnetic properties via spin state switching could enhance catalytic rates, overcoming limitations of bulk copper surfaces.

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology
  • Computational Chemistry

Background:

  • Copper surfaces offer high catalytic selectivity but suffer from slow hydrogen dissociation kinetics.
  • Nanoscale structures, specifically icosahedral Cu13 nanoclusters, are explored to potentially enhance catalytic performance.
  • The role of electronic and magnetic properties at the nanoscale is crucial for understanding catalytic mechanisms.

Purpose of the Study:

  • To investigate the catalytic properties of icosahedral Cu13 nanoclusters for hydrogen dissociation.
  • To determine the influence of spin state and magnetic properties on the kinetics of hydrogen dissociation.
  • To identify strategies for improving catalytic rates by manipulating the magnetic behavior of nanoclusters.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed to model Cu13 nanoclusters.
  • Analysis of spin states, magnetic moments, and transition states for hydrogen dissociation.
  • Evaluation of activation energies and kinetic rates under different magnetic conditions.

Main Results:

  • Cu13 nanoclusters exhibit significant magnetic moments due to finite size and symmetry.
  • Catalytic activity is dependent on the spin state, with a lower activation energy for hydrogen dissociation observed upon a spin switch from 5 to 3 μB.
  • Without this spin switch, activation energy is higher than on single-crystal copper surfaces.
  • Weak spin-orbit coupling impedes the necessary spin switch, reducing the kinetic rate by a factor of 16.

Conclusions:

  • The spin state of Cu13 nanoclusters is a critical factor influencing hydrogen dissociation kinetics.
  • Tailoring magnetic properties through spin state control offers a promising avenue for improving copper-based catalysts.
  • Strategies like optical excitations, substitution, and co-catalysis could facilitate spin switches and enhance catalytic efficiency.