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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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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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Valence Bond Theory02:42

Valence Bond Theory

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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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Common Ion Effect03:24

Common Ion Effect

45.2K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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,...
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
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Specific ion effects at graphitic interfaces.

Cheng Zhan1, Maira R Cerón1, Steven A Hawks1

  • 1Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA.

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Summary
This summary is machine-generated.

Understanding ion behavior at graphene interfaces is key for energy storage and desalination. This study reveals ion adsorption depends on size, pore confinement, and charge transfer, impacting interfacial capacitance.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Electrochemistry

Background:

  • Understanding aqueous solutions at graphitic interfaces is crucial for energy storage and water desalination technologies.
  • Mechanistic details of interfacial structure and ion response under applied voltage remain unclear.

Purpose of the Study:

  • Investigate alkali-metal cation adsorption at graphene interfaces and within graphene slit-pores.
  • Clarify the influence of intrinsic ion properties, confinement, and applied voltage on interfacial behavior.

Main Methods:

  • Hybrid first-principles/continuum simulations.
  • Electrochemical measurements.
  • Analysis of alkali-metal cation adsorption at graphene interfaces.

Main Results:

  • Adsorption energy increases with ionic radius and is highly dependent on pore size.
  • Interfacial charge transfer significantly contributes to ion-graphene interaction, enhanced by confinement.
  • Interfacial capacitance trends arise from a complex interplay of voltage, confinement, and specific ion effects.

Conclusions:

  • Ion adsorption and interfacial capacitance at graphene are governed by a combination of factors, including ion size, hydration, charge transfer, and pore confinement.
  • Findings challenge conventional electrochemical models by highlighting the role of charge transfer and confinement effects.