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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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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.
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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...
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Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

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A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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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...
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Imperfections in Crystal Structure: Non-Stoichiometric Defects

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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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Related Experiment Video

Updated: Apr 30, 2026

X-Ray Crystallography to Study the Oligomeric State Transition of the Thermotoga maritima M42 Aminopeptidase TmPep1050
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Rebuttal to the article Pathological crystal structures.

Hong Chen1, Marilyn M Olmstead2, Richard H Fish1

  • 1Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720, USA.

Acta Crystallographica. Section C, Structural Chemistry
|June 17, 2024
PubMed
Summary
This summary is machine-generated.

This study refutes claims that a silver complex was formed, presenting evidence for a rhodium(I) anionic complex, [RhI(η1-N3-1-MT)2]-, through reductive elimination of Cp*OH.

Keywords:
rebuttal

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Crystallography

Background:

  • A previous study incorrectly identified an Ag(I) complex instead of the intended Rh(I) anionic complex.
  • This misidentification stemmed from the use of silver triflate (AgOTf) in the synthesis of a water-soluble rhodium precursor.

Purpose of the Study:

  • To invalidate the claim of Ag(I) complex formation.
  • To confirm the synthesis and structure of the Rh(I) anionic component, [RhI(η1-N3-1-MT)2]-.
  • To present a detailed mechanistic explanation and supporting experimental data.

Main Methods:

  • Reaction of [(Cp*Rh)2(μ-OH)3]+ with 1-methylthymine (1-MT) under specific pH and temperature conditions.
  • Control experiments using Rh(OH)3 and AgOTf with 1-methylthymine.
  • 1H NMR spectroscopy in D2O at varying pD values and temperatures.
  • Analysis of X-ray crystal structures.

Main Results:

  • The formation of the Rh(I) anionic complex [RhI(η1-N3-1-MT)2]- was confirmed, with Cp*OH identified as a reductive elimination product.
  • Control experiments demonstrated that AgOTf would form insoluble AgOH at pH 10, precluding reaction with 1-methylthymine.
  • 1H NMR spectroscopy confirmed the structure in solution and in crystals, independent of silver complexes.

Conclusions:

  • The premise of Ag(I) complex formation is invalid.
  • The synthesis of the Rh(I) anionic component is robust and supported by spectroscopic and crystallographic evidence.
  • A proposed mechanism for the formation of the anionic complex is presented and validated.