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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
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Stability Trends in Mono-Metallic 3d Layered Double Hydroxides.

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Summary

Intercalating layered double hydroxides (LDHs) with lactate enhances their stability compared to water or carbonate. This research shows how intercalants impact LDH materials for better performance.

Keywords:
LDA + ULDHdensity functional theorygreen rustintercalationlayered double hydroxidesstability

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Layered double hydroxides (LDHs) are 2D materials with promising catalytic, optical, and electronic properties.
  • LDHs often exhibit lower stability than their oxide counterparts, limiting their applications.
  • Understanding factors influencing LDH stability is crucial for material design.

Purpose of the Study:

  • To quantitatively assess the impact of intercalants on the stability of manganese, iron, and cobalt-based LDHs.
  • To investigate the role of intercalant charge and dispersion effects on LDH stability.
  • To explore how intercalants can favorably alter the electronic bandgap of LDHs.

Main Methods:

  • Density functional theory (DFT) calculations were employed.
  • The stability of various LDH compounds with different intercalants (water, lactate, carbonate) was analyzed.
  • Dispersion effects on LDH stability were quantitatively evaluated.

Main Results:

  • Singly charged lactate intercalation significantly enhances LDH stability across Mn, Fe, and Co-based compounds.
  • Lactate intercalation provides greater stability compared to neutral water and doubly charged carbonate.
  • Dispersion effects were found to contribute positively to the overall stability of these LDH systems.
  • Intercalation was shown to favorably modify the electronic bandgap of the studied LDHs.

Conclusions:

  • The choice of intercalant is critical for improving the stability of layered double hydroxides.
  • Lactate emerges as a superior intercalant for enhancing the stability of common Mn, Fe, and Co-based LDHs.
  • This study provides a quantitative understanding of intercalant effects, guiding the design of more stable and functional LDH materials.