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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
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Valence Bond Theory02:42

Valence Bond Theory

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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Related Experiment Video

Updated: Jul 8, 2026

Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
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Modular salt-induced nanostructures formed by a functionalized dipeptide system.

Simona Bianco1, Ravi R Sonani2, Dipankar Ghosh1

  • 1School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, U.K.

Matter
|February 23, 2026
PubMed
Summary
This summary is machine-generated.

Naphthalene-modified dipeptides (2NapIF) self-assemble into diverse nanostructures like fibers and nanotubes. This modular system offers potential for creating novel, meter-long, salt-responsive materials.

Keywords:
BiomaterialCryo-EMNanotechnology

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Area of Science:

  • Nanotechnology
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Self-assembling peptides are promising building blocks in nanotechnology.
  • Designing modular peptide systems is key for creating complex nanostructures.

Purpose of the Study:

  • To introduce and characterize a naphthalene-modified dipeptide, isoleucine-phenylalanine (2NapIF), as a modular system for self-assembly.
  • To explore the formation of diverse nanostructures from 2NapIF under varying conditions.

Main Methods:

  • Synthesis of naphthalene-modified dipeptide (2NapIF).
  • Induction of self-assembly using salts and mechanical stirring.
  • Characterization of nanostructures using cryo-electron microscopy (cryo-EM).

Main Results:

  • 2NapIF self-assembles into fibers, nanotubes, and bundles influenced by salt concentration.
  • Cryo-EM revealed that hydrophobic stacking and hydrogen bonding drive nanostructure organization.
  • A single KCl-induced nanotube contained 18 distinct 2NapIF conformations, forming a large asymmetric unit.

Conclusions:

  • The 2NapIF system demonstrates remarkable modularity and conformational diversity in self-assembly.
  • This peptide system enables the creation of predictable, yet complex, nanostructures.
  • Potential applications include the development of innovative, meter-long, salt-responsive materials.