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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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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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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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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Crystal structure of Zn2(HTeO3)(AsO4).

Felix Eder1, Matthias Weil1

  • 1Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, TU Wien, Getreidemarkt 9/164-SC, A-1060, Vienna, Austria.

Acta Crystallographica. Section E, Crystallographic Communications
|May 24, 2021
PubMed
Summary

Researchers synthesized new zinc tellurate arsenate crystals, Zn₂(HTeO₃)(AsO₄), using a hydrothermal method. This study details the crystal structure and bonding of this novel inorganic compound.

Keywords:
crystal structurehydrogen bondinglone pair electronsoxidoarsenate(V)oxidotellurate(IV)stereochemical activity

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Area of Science:

  • Inorganic Chemistry
  • Crystallography
  • Materials Science

Background:

  • Hydrothermal synthesis is a key method for creating novel inorganic compounds.
  • Tellurates and arsenates are classes of compounds with diverse structural and electronic properties.

Purpose of the Study:

  • To synthesize and characterize single crystals of a new zinc tellurate arsenate compound.
  • To elucidate the crystal structure, coordination environments, and bonding of the synthesized material.

Main Methods:

  • Hydrothermal reaction using zinc nitrate, tellurium dioxide, arsenic acid, and ammonia.
  • Single-crystal X-ray diffraction for structural determination.

Main Results:

  • Successful synthesis of dizinc(II) hydroxidodioxidotellurate(IV) oxidoarsenate(V), Zn₂(HTeO₃)(AsO₄).
  • Detailed crystallographic analysis revealing a three-dimensional framework structure.
  • Identification of distorted trigonal bipyramidal coordination for Zn(II) and bis-phenoid coordination for Te(IV), indicating stereochemical activity.

Conclusions:

  • The study presents a novel inorganic compound with a complex framework structure.
  • The coordination geometries and stereochemical activity of the tellurium lone pair are key features of this structure.