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Formation of Complex Ions03:45

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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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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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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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Crystal Field Theory
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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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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.
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Cation Exchange in Colloidal Transition Metal Nitride Nanocrystals.

Lei Yang1, Liping Zhang2,3, Ye Li1

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|April 25, 2024
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This study introduces cation exchange reactions for synthesizing transition metal nitride (TMN) nanocrystals, creating novel Ni4N and CoN materials. These TMNs show promise as catalysts for the oxygen evolution reaction (OER).

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Transition metal nitrides (TMNs) possess desirable properties for electronics, photonics, energy storage, and catalysis.
  • Synthesizing TMN nanostructures with controlled composition and morphology in solution is challenging.
  • Cation exchange reaction (CER) is a powerful postsynthetic method for creating complex nanostructures, but its application in TMNs is underexplored.

Purpose of the Study:

  • To demonstrate the feasibility of cation exchange reactions in colloidal transition metal nitride nanocrystals.
  • To synthesize novel Ni4N and CoN nanocrystals and their core@shell heterostructures.
  • To evaluate the catalytic performance of the synthesized Ni4N and CoN nanocrystals for the oxygen evolution reaction (OER).

Main Methods:

  • Utilized colloidal Cu3N nanocrystals as precursors for cation exchange reactions.
  • Synthesized Ni4N and CoN nanocrystals by controlling reaction conditions.
  • Fabricated Cu3N@Ni4N and Cu3N@CoN core@shell heterostructures.
  • Characterized the synthesized nanomaterials and evaluated their electrochemical OER performance.

Main Results:

  • Successfully synthesized Ni4N and CoN nanocrystals via cation exchange from Cu3N.
  • Obtained tunable Cu3N@Ni4N and Cu3N@CoN core@shell heterostructures.
  • CoN nanocrystals exhibited excellent OER performance: low overpotential (286 mV at 10 mA·cm-2), small Tafel slope (89 mV·dec-1), and good stability.
  • Ni4N nanocrystals were also synthesized and showed potential catalytic activity.

Conclusions:

  • Cation exchange reaction is a viable and versatile strategy for synthesizing transition metal nitride nanocrystals and heterostructures.
  • The developed method provides access to novel TMN materials with tunable properties.
  • CoN nanocrystals show significant promise as efficient electrocatalysts for the oxygen evolution reaction, advancing energy storage applications.