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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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
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,...
Determination of Crystal Structures01:29

Determination of Crystal Structures

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...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...

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Updated: Jun 30, 2026

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Crystal engineering in IUCrJ 2021: interactions, structures, properties.

Gautam R Desiraju1

  • 1Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, 560 012, India.

Iucrj
|May 13, 2022
PubMed
Summary
This summary is machine-generated.

Chemistry and crystal engineering research in IUCrJ (International Union of Crystallography Journal) from 2021 onwards explores molecular interactions, crystal structures, and material properties. These studies broadly investigate the relationships between structure and function in crystalline materials.

Keywords:
crystal structurecrystallizationintermolecular interactions

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Area of Science:

  • Crystal engineering
  • Solid-state chemistry
  • Materials science

Background:

  • Recent publications in IUCrJ (International Union of Crystallography Journal) focus on the fundamental aspects of crystal engineering and solid-state chemistry.
  • The scope encompasses a wide range of studies from 2021 onwards, emphasizing the interconnectedness of molecular interactions, structural arrangements, and resulting material properties.

Discussion:

  • Articles delve into the nuances of intermolecular and intramolecular interactions that dictate crystal packing and stability.
  • The broad interpretation of 'structure' includes not only atomic arrangements but also supramolecular assemblies and their influence on macroscopic behavior.

Key Insights:

  • Understanding structure-property relationships is crucial for designing novel materials with tailored functionalities.
  • The journal highlights the versatility of crystal engineering in fields ranging from pharmaceuticals to functional materials.

Outlook:

  • Future research will likely continue to explore complex interaction networks and advanced characterization techniques.
  • Predictive modeling and computational approaches are expected to play an increasing role in crystal design and property prediction.