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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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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...
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To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
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MO Theory and Covalent Bonding02:40

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The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
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Hückel's Rule Diagram of π MOs: Frost Circle01:08

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The Frost circle or the inscribed polygon method is a graphical method for determining the relative energies of π molecular orbitals (MOs) for planar, fully conjugated, and monocyclic compounds. This method was first described by A. A. Frost and Boris Musulin in 1953.
A Frost circle is constructed by drawing a polygon whose number of edges is equal to the number of carbons of the given cyclic system, with one of the vertices pointing down. Then, a circle is drawn enclosing the polygon so that...
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Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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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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Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
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Synthèse et étude structrale de lyonsite-type (Na0,4,Li0,6)(Fe,Li2)(MoO4)3.

Amira Souilem1, Mohamed Faouzi Zid1, Ahmed Driss1

  • 1Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis ElManar, 2092 Manar II Tunis, Tunisie.

Acta Crystallographica. Section E, Crystallographic Communications
|June 20, 2015
PubMed
Summary

A novel sodium-lithium iron molybdate compound was synthesized, revealing a unique 3D framework with [100] tunnels. This structure facilitates cation mobility, crucial for potential applications in materials science.

Keywords:
bond-valence calculationscrystal structurelyonsite-typemonovalent cation molybdate

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Crystallography

Background:

  • Molybdates are versatile compounds with applications in catalysis, energy storage, and pigments.
  • Understanding the structural intricacies of novel molybdate compounds is key to unlocking their functional properties.

Purpose of the Study:

  • To synthesize and characterize a new sodium-lithium iron molybdate compound.
  • To elucidate the crystal structure and cation distribution within the framework.
  • To compare the structure with related molybdate compounds.

Main Methods:

  • Melt synthesis technique for crystal growth.
  • X-ray diffraction for structural determination.
  • Bond-valence calculations to validate cation disorder models.

Main Results:

  • The compound (Na0.4,Li0.6)(Fe,Li2)(MoO4)3 was successfully synthesized.
  • A 3D framework structure with [100] tunnels was identified, containing disordered Li(+), Fe(3+), Na(+), and Li(+) cations.
  • The structure is isotypic with Li3Fe(MoO4)3 and Li3Ga(MoO4)3.

Conclusions:

  • The synthesized molybdate exhibits a complex framework structure with potential for ion transport.
  • The cation disorder model is supported by bond-valence calculations.
  • Structural comparison provides insights into structure-property relationships in related molybdates.