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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
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Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
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The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
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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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Related Experiment Video

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Grafting Multiwalled Carbon Nanotubes with Polystyrene to Enable Self-Assembly and Anisotropic Patchiness
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π-π interactions in carbon nanostructures.

Emilio M Pérez1, Nazario Martín

  • 1IMDEA Nanociencia, C/Faraday 9, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain. emilio.perez@imdea.org.

Chemical Society Reviews
|August 15, 2015
PubMed
Summary

This review explains pi-pi interactions, the key forces in carbon nanostructures like graphene and nanotubes. Understanding these interactions is crucial for advancing carbon chemistry and designing new materials.

Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Carbon nanostructures, such as fullerenes, carbon nanotubes, and graphene, possess extensive conjugated pi-systems.
  • Pi-pi interactions are the primary supramolecular forces governing the assembly and properties of these carbon-based materials.

Purpose of the Study:

  • To introduce the fundamental concepts of pi-pi interactions.
  • To illustrate the role of pi-pi interactions in carbon nanostructures.
  • To provide a tutorial overview for researchers in carbon chemistry.

Main Methods:

  • Review of existing literature on supramolecular chemistry and carbon nanostructures.
  • Conceptual explanation of pi-pi interactions.
  • Case studies focusing on fullerenes, carbon nanotubes, and graphene.

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Main Results:

  • Demonstration that pi-pi interactions are dominant forces in carbon nanostructures.
  • Highlighting the successful application of pi-pi interactions in constructing supramolecular ensembles.
  • Establishing a foundational understanding of these interactions for further research.

Conclusions:

  • Pi-pi interactions are essential for understanding and manipulating carbon nanostructures.
  • The strategic use of these interactions opens new possibilities in carbon chemistry.
  • This review serves as a foundational resource for exploring pi-pi interactions in advanced carbon materials.