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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...
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...
Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

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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Updated: Jun 3, 2026

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Published on: February 15, 2016

Recent advances in hydrogen-bonded hexameric encapsulation complexes.

Liat Avram1, Yoram Cohen, Julius Rebek

  • 1School of Chemistry, The Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv 69978, Tel Aviv, Israel.

Chemical Communications (Cambridge, England)
|March 25, 2011
PubMed
Summary
This summary is machine-generated.

This review covers hexameric resorcin[4]arenes and pyrogallol[4]arenes chemistry. Research explores molecular behavior in confined spaces for applications in catalysis and transport.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry

Background:

  • Review of basic research in hexameric resorcin[4]arenes and pyrogallol[4]arenes chemistry over the past decade.
  • Focus on understanding molecular behavior within confined spaces.

Purpose of the Study:

  • To review recent advancements in the chemistry of hexameric resorcin[4]arenes and pyrogallol[4]arenes.
  • To discuss the application of Nuclear Magnetic Resonance (NMR) methods for structural and dynamic analysis.
  • To highlight the challenge of translating fundamental knowledge into practical applications.

Main Methods:

  • Review of existing literature on hexameric resorcin[4]arenes and pyrogallol[4]arenes.
  • Discussion of Nuclear Magnetic Resonance (NMR) techniques for structural elucidation.
  • Analysis of host-guest properties and exchange dynamics.

Main Results:

  • Detailed insights into the solution structures of these molecular systems.
  • Characterization of their host-guest complexation behavior.
  • Understanding of their dynamic exchange processes.

Conclusions:

  • Significant progress in understanding the fundamental chemistry of these molecules.
  • Established utility of NMR methods for detailed characterization.
  • Identified the critical need to bridge fundamental research with applied science in areas like catalysis and transport.