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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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Unit Cells01:18

Unit Cells

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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...
126
Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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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Determination of Crystal Structures01:29

Determination of Crystal Structures

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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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Related Experiment Video

Updated: May 1, 2026

Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
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Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups

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A germanosilicate structure with 11×11×12-ring channels solved by electron crystallography.

Wei Hua1, Hong Chen, Zheng-Bao Yu

  • 1College of Chemistry and Molecular Engineering, Peking University, Beijing 100871 (P. R. China).

Angewandte Chemie (International Ed. in English)
|April 11, 2014
PubMed
Summary

Researchers developed PKU-16, a novel germanosilicate zeolite with a unique 11×11×12-ring channel system. This new material offers potential for fine-tuning pore sizes and shapes in industrial applications.

Keywords:
electron microscopyporous materialspowder X-ray diffractionstructure elucidationzeolites

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Last Updated: May 1, 2026

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Crystallography

Background:

  • Zeolites are crucial industrial materials due to their ordered micropores and stable frameworks.
  • Pore size and shape critically influence zeolite performance in catalysis, sorption, and separation.
  • Optimizing zeolite performance requires precise control over pore dimensions.

Purpose of the Study:

  • To introduce the first germanosilicate zeolite with an 11×11×12-ring channel system, designated PKU-16.
  • To characterize the structure of nanosized PKU-16 using advanced techniques.

Main Methods:

  • Synthesis of a novel germanosilicate zeolite.
  • Structural characterization using three-dimensional rotation electron diffraction (RED).

Main Results:

  • Discovery of PKU-16, a zeolite with a unique 11×11×12-ring channel system.
  • Nanosized PKU-16 was successfully synthesized and characterized.
  • PKU-16 exhibits structural relationships to zeolite β polymorph C (BEC).

Conclusions:

  • PKU-16 represents a new structural type of germanosilicate zeolite.
  • The fine-tuning of pore structure in PKU-16 opens new avenues for tailored industrial applications.
  • RED is a powerful technique for characterizing novel zeolite structures.