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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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Valence Bond Theory02:42

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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...
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Overview of Valence Bond Theory
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Noncovalent Attractions in Biomolecules02:35

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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.
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Hydrogen-bonded complexes upon spatial confinement: structural and energetic aspects.

Paweł Lipkowski1, Justyna Kozłowska, Agnieszka Roztoczyńska

  • 1Theoretical Chemistry Group, Institute of Physical and Theoretical Chemistry, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, Wrocław, Poland. pawel.lipkowski@pwr.wroc.pl.

Physical Chemistry Chemical Physics : PCCP
|December 4, 2013
PubMed
Summary
This summary is machine-generated.

Spatial confinement impacts hydrogen-bonded systems, altering their structure and energy. Orbital compression affects hydrogen bond characteristics and interaction energies in dimeric molecules like HF···HF.

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Area of Science:

  • Computational chemistry
  • Quantum chemistry
  • Molecular modeling

Background:

  • Hydrogen-bonded systems are fundamental in chemistry and biology.
  • Understanding the effects of spatial confinement is crucial for various applications.
  • Previous studies have explored confinement effects, but detailed analysis of orbital compression on H-bonds is ongoing.

Purpose of the Study:

  • To investigate the structural and energetic consequences of spatial confinement on hydrogen-bonded dimeric systems.
  • To analyze the impact of orbital compression on hydrogen bond topology and interaction energies.
  • To explore the changes in interaction energy components under confinement.

Main Methods:

  • Computational modeling of model dimeric systems (HF···HF, HCN···HCN, HCN···HCCH) under cylindrical confinement.
  • Application of a two-dimensional harmonic oscillator potential to simulate confinement.
  • Electronic structure calculations using MP2 and Density Functional Theory (DFT) with B3LYP and M06-2X potentials.
  • Geometry optimization without constraints in the presence of the confining potential.
  • Analysis of hydrogen bond characteristics using the Quantum Theory of Atoms in Molecules (QTAIM).
  • Energetic analysis including variational-perturbational decomposition of interaction energy.

Main Results:

  • Spatial confinement significantly influences the structural and energetic properties of hydrogen-bonded systems.
  • Orbital compression leads to notable changes in the topological parameters of hydrogen bonds.
  • The interaction energy trends of confined H-bonded complexes differ from unconfined systems.
  • Decomposition of interaction energy reveals specific contributions affected by confinement.

Conclusions:

  • The study demonstrates that spatial confinement, particularly orbital compression, alters the nature and strength of hydrogen bonds.
  • Computational methods like MP2 and DFT are effective in characterizing these confined systems.
  • The findings provide insights into the behavior of H-bonded systems in constrained environments, relevant for molecular recognition and materials science.