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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Valence Bond Theory02:42

Valence Bond Theory

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...
Unit Cells01:18

Unit Cells

A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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,...
Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
Structural Isomerism02:34

Structural Isomerism

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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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Published on: July 8, 2021

Amine templated two- and three-dimensional uranyl sulfates.

Mohan S Bharara1, Anne E V Gorden

  • 1Auburn University, Dept. of Chemistry and Biochemistry, Auburn, AL 36849, USA.

Dalton Transactions (Cambridge, England : 2003)
|April 1, 2010
PubMed
Summary

Amine template uranyl sulfate frameworks exhibit structural variability, forming 2D and 3D structures with diverse channel dimensions. This research explores the structural diversity in these uranyl sulfate materials.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Crystallography

Background:

  • Uranyl sulfate frameworks are a class of coordination polymers with potential applications in areas like nuclear waste remediation and catalysis.
  • The incorporation of amine templates can influence the self-assembly and structural dimensionality of these frameworks.

Purpose of the Study:

  • To investigate the structural diversity and variability of amine template uranyl sulfate frameworks.
  • To characterize the dimensionality and channel dimensions of the synthesized frameworks.

Main Methods:

  • Solvothermal synthesis of uranyl sulfate frameworks using various amine templates.
  • Single-crystal X-ray diffraction for structural determination.
  • Analysis of framework dimensionality and pore dimensions.

Main Results:

  • Observation of both two- and three-dimensional structural motifs in amine template uranyl sulfate frameworks.
  • Identification of channels with varying dimensions, including 7.4 Å x 5.1 Å, 36 Å x 5.8 Å, and 10 Å x 10 Å.
  • Correlation between the amine template structure and the resulting framework topology.

Conclusions:

  • Amine templates play a crucial role in directing the structural assembly of uranyl sulfate frameworks.
  • The observed structural variability leads to frameworks with tunable channel sizes, relevant for host-guest chemistry.
  • This study expands the library of uranyl-based materials with potential for diverse applications.