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Related Concept Videos

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...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Catalysis02:50

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
Formation of Complex Ions03:45

Formation of Complex Ions

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...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...

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Updated: May 14, 2026

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
08:40

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules

Published on: April 28, 2014

π-Conjugated nickel bis(dithiolene) complex nanosheet.

Tetsuya Kambe1, Ryota Sakamoto, Ken Hoshiko

  • 1Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan.

Journal of the American Chemical Society
|January 31, 2013
PubMed
Summary

Researchers created a novel π-conjugated nanosheet using nickel bis(dithiolene) complexes. This semiconducting material, synthesized via interfacial reactions, can be produced as single layers and its oxidation state modulated.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • π-conjugated materials are crucial for organic electronics.
  • Developing scalable synthesis methods for 2D conjugated materials remains a challenge.
  • Nickel bis(dithiolene) complexes offer unique electronic properties.

Purpose of the Study:

  • To synthesize a π-conjugated nanosheet using nickel bis(dithiolene) complexes.
  • To achieve single-layer nanosheet fabrication.
  • To explore the redox tunability of the synthesized material.

Main Methods:

  • Bottom-up synthesis via liquid-liquid and gas-liquid interfacial reactions.
  • Utilized benzenehexathiol and nickel(II) acetate.
  • Characterization using Powder X-ray diffraction, Atomic Force Microscopy, and Scanning Tunneling Microscopy.

Main Results:

  • Successfully synthesized a π-conjugated nanosheet of nickel bis(dithiolene) complexes.
  • Achieved single-layer nanosheet formation using a gas-liquid interfacial reaction.
  • Demonstrated the ability to modulate the oxidation state of the nanosheet via redox reactions.

Conclusions:

  • A novel π-conjugated nanosheet material based on nickel bis(dithiolene) complexes was successfully synthesized.
  • The developed interfacial reaction methods allow for the fabrication of single-layer nanosheets.
  • The redox tunability of these nanosheets opens possibilities for electronic applications.