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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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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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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 malleability....
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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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Crystal Field Theory - Octahedral Complexes02:58

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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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Crystal Growth: Principles of Crystallization01:25

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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A crystalline stannyne.

Xin-Feng Wang1, Chaopeng Hu1, Jiancheng Li1

  • 1Department of Chemistry and Research Center for Chemical Biology and Omics Analysis, College of Science, Southern University of Science and Technology, Shenzhen, China.

Nature Chemistry
|June 17, 2024
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a stable, base-free stannyne, a carbon-tin multiple bond compound. This breakthrough allows for room-temperature characterization and opens new avenues in heavy group 14 element chemistry.

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Area of Science:

  • Organometallic Chemistry
  • Main Group Chemistry
  • Synthetic Chemistry

Background:

  • Synthesis of heavier group 14 element alkyne analogues (E = Si, Ge, Sn, Pb) is challenging.
  • Neutral silynes and germynes are stable only at low temperatures with Lewis base stabilization.

Purpose of the Study:

  • To synthesize and characterize a base-free stannyne at room temperature.
  • To investigate the electronic structure and reactivity of the novel carbon-tin multiple bond.

Main Methods:

  • Strategic use of bulky cyclic phosphino and terphenyl ligands.
  • Isolation and structural characterization of the stannyne at room temperature.
  • Reactivity studies with isocyanides, dienes, and other reagents.

Main Results:

  • Isolation of a base-free stannyne (R¹-C≡Sn-R²) at room temperature.
  • Characterization of an allenic structure with delocalized π-electrons and a C-Sn multiple bond with ionic character.
  • Demonstrated reactivity analogous to carbenes and stannylenes.

Conclusions:

  • The developed synthetic strategy enables the isolation of stable stannynes.
  • The stannyne exhibits unique electronic properties and reactivity, expanding the scope of group 14 chemistry.
  • This work provides a foundation for exploring heavier alkyne analogues.