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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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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
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Intercalating a potassium-aqua complex cation into an α-MoO3 layer without reducing molybdenum: a potential storage

Debu Jana1, Shalini Sanjay Mishra1, Samar K Das1

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Researchers developed a green synthesis for rod-shaped molybdenum trioxide (MoO3) using an aqueous method. This new MoO3 material shows potential for storing alkali metal ions.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Green Chemistry

Background:

  • Molybdenum trioxide (MoO3) is a versatile material with applications in catalysis and energy storage.
  • Developing sustainable synthesis methods for advanced materials is crucial for environmental protection.
  • Ion-exchange reactions offer a pathway for modifying material structures and properties.

Purpose of the Study:

  • To demonstrate a green, aqueous synthesis of rod-shaped molybdenum trioxide (MoO3) material.
  • To investigate the intercalation of potassium-aqua-complex acetate into the lamellar structure of MoO3.
  • To evaluate the potential of the synthesized MoO3 as a storage system for alkali metal ions.

Main Methods:

  • Green aqueous synthesis.
  • Ion-exchange reaction using potassium ions ({K(H2O)4}+) to replace cobalt ions (Co(II)).
  • Characterization of the resulting molybdenum trioxide material [MoVI3O9{K(H2O)4}(CH3COO)]·H2O (2).

Main Results:

  • Successful synthesis of rod-shaped MoO3 material through a green aqueous ion-exchange process.
  • Formation of a potassium-aqua-complex acetate intercalated MoO3 structure ([MoVI3O9{K(H2O)4}(CH3COO)]·H2O).
  • Demonstration of compound 2 as a potential storage system for alkali metal ions.

Conclusions:

  • A novel, environmentally friendly aqueous synthesis route for rod-shaped MoO3 has been established.
  • The synthesized MoO3 material exhibits potential for alkali metal ion storage applications.
  • This work contributes to the development of sustainable materials for energy storage solutions.