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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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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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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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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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Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
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Coordination Number and Geometry02:57

Coordination Number and Geometry

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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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Structural complexity of natural uranyl sulfates.

Vladislav V Gurzhiy1, Jakub Plášil2

  • 1Department of Crystallography, St. Petersburg State University, University Emb. 7/9, St. Petersburg, 199034, Russian Federation.

Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
|August 25, 2020
PubMed
Summary

Natural uranyl sulfates exhibit diverse and complex structures, with some minerals showing exceptionally high complexity due to extensive hydrogen bonding networks crucial for stability.

Keywords:
Shannon informationcrystal structureladder diagramsstructural complexitytopological complexityuranyl sulfates

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Area of Science:

  • Mineralogy and Crystallography
  • Geochemistry
  • Materials Science

Background:

  • Uranyl sulfates, with approximately 40 known natural members, display remarkable structural diversity, ranging from polyhedral clusters to layered arrangements.
  • The linkages between uranium (U) and sulfur (S) polyhedra in these compounds exhibit significant variability.
  • Structural complexity, quantified using Shannon information per unit cell, generally falls within intermediate to complex ranges for most natural uranyl sulfates.

Purpose of the Study:

  • To analyze the structural complexity of natural uranyl sulfates.
  • To identify specific minerals with exceptionally high structural complexity.
  • To investigate the role of hydrogen bonding networks in stabilizing these complex structures.

Main Methods:

  • Calculation of Shannon information content per unit cell for natural uranyl sulfate structures.
  • Identification of minerals exceeding 1000 bits per cell in complexity.
  • Application of informational ladder diagrams to quantify contributions from topology, symmetry, and bonding.

Main Results:

  • Most natural uranyl sulfates are classified as intermediate (300-500 bits/cell) to complex (500-1000 bits/cell).
  • Alwilkinsite-(Y) (1685.95 bits/cell), sejkoraite-(Y) (1859.72 bits/cell), and natrozippeite (2528.63 bits/cell) represent exceptionally complex structures.
  • Extensive hydrogen bonding networks are identified as critical for the stability of these complex structures, facilitating charge propagation and cation linkage.

Conclusions:

  • The structural complexity of uranyl sulfates is significantly influenced by topological features and interlayer bonding, particularly hydrogen bonds.
  • Hydrogen bonding plays a vital role in stabilizing complex uranyl sulfate structures by managing charge distribution and accommodating interlayer cations.
  • Informational ladder diagrams provide a quantitative method to dissect the sources of structural complexity in minerals.