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Related Concept Videos

Common Ion Effect03:24

Common Ion Effect

34.1K
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:
34.1K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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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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Ionic Crystal Structures02:42

Ionic Crystal Structures

18.0K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
18.0K
Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

2.9K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
2.9K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.4K
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...
28.4K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

47.5K
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...
47.5K

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Cationic constraint effects in metaphosphate glasses.

Bruno P Rodrigues1, Lothar Wondraczek1

  • 1Otto-Schott-Institute of Materials Research, University of Jena, 07743 Jena, Germany.

The Journal of Chemical Physics
|June 9, 2014
PubMed
Summary
This summary is machine-generated.

Bond constraint theory (BCT) struggles with ionic bonds in glasses. Introducing constraint strength helps predict properties by accounting for how modifier ions bind to oxygen, improving glass science understanding.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Computational Materials Science

Background:

  • Temperature-dependent bond constraint theory (BCT) is a simplified model for predicting glass properties based on atomic degrees of freedom.
  • The theory's applicability is limited by its inability to accurately incorporate ionic bonding and differentiate the effects of various cationic species.

Purpose of the Study:

  • To investigate the limitations of bond constraint theory (BCT) when applied to glasses with ionic bonding.
  • To introduce a new concept, constraint strength, to improve the prediction of glass properties in the presence of modifier ions.

Main Methods:

  • Analysis of metaphosphate glasses with diverse modifier cation species.
  • Evaluation of the predictive capability of bond constraint theory (BCT).
  • Introduction and application of the concept of constraint strength based on Coulombic forces.

Main Results:

  • Bond constraint theory (BCT) fails to predict properties of metaphosphate glasses containing ionic bonds due to the specific influence of modifier ions.
  • The rigidity of the glass network is significantly affected by the unique contributions of each modifier species.
  • Constraint strength emerges as a viable metric for quantifying the influence of ionic modifiers on glass properties.

Conclusions:

  • The standard bond constraint theory (BCT) is insufficient for accurately modeling glasses with significant ionic bonding.
  • The newly proposed constraint strength offers a more nuanced approach to understanding and predicting the properties of ionic glasses.
  • Further research into constraint strength can enhance the design and application of novel glass materials.