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Hydrogen Bonds01:04

Hydrogen Bonds

11.7K
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

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.
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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Introduction to Chemical Bonds01:01

Introduction to Chemical Bonds

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Chemical Bonds
The electrons of the outermost energy level determine the energetic stability of the atom and its tendency to form chemical bonds with other atoms. The innermost electron shell has a maximum capacity of two electrons, but the next two electron shells can each have a maximum of eight electrons. This is known as the octet rule, which states that, with the exception of the innermost shell, atoms are most stable energetically when they have eight electrons in their valence shell, the...
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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.
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,...
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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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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

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Surface-based supramolecular chemistry using hydrogen bonds.

Anna G Slater1, Luis M A Perdigão, Peter H Beton

  • 1School of Chemistry, ‡School of Physics and Astronomy, University of Nottingham , Nottingham NG7 2RD, United Kingdom.

Accounts of Chemical Research
|October 21, 2014
PubMed
Summary
This summary is machine-generated.

Researchers designed 3,4,9,10-perylene tetracarboxylic acid diimides (PTCDIs) to self-assemble into extended 2D arrays on surfaces. These porous structures can capture guest molecules, demonstrating controlled molecular organization via hydrogen bonds.

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Area of Science:

  • Supramolecular chemistry
  • Materials science
  • Surface chemistry

Background:

  • Molecular self-assembly on surfaces is less explored than solution or solid-state systems.
  • Intermolecular interactions, particularly hydrogen bonds, are key to organizing molecules.
  • 3,4,9,10-perylene tetracarboxylic acid diimides (PTCDIs) offer a versatile platform for surface-based self-assembly.

Purpose of the Study:

  • To investigate the self-assembly of PTCDI derivatives on surfaces.
  • To explore the formation of extended, porous 2D arrays using hydrogen bonding.
  • To demonstrate the ability to functionalize PTCDIs for modified self-assembled structures.

Main Methods:

  • Utilizing complementary hydrogen bonding between PTCDIs and diaminopyridine derivatives.
  • Functionalizing PTCDI molecules in the bay region to tune self-assembly.
  • Combining PTCDI derivatives, and sometimes melamine, to create 2D arrays.

Main Results:

  • Successfully formed extended 2D arrays of PTCDI derivatives on surfaces.
  • Developed porous supramolecular structures capable of entrapping guest molecules.
  • Demonstrated functionalization of PTCDIs to control array properties.

Conclusions:

  • PTCDI derivatives are effective building blocks for surface-based self-assembly.
  • Hydrogen bonding provides a reliable strategy for constructing ordered molecular arrays.
  • The developed arrays can host specific molecular species, including fullerenes and metal clusters.