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Related Concept Videos

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.
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...
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
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Hybridization of Atomic Orbitals II

sp3d and sp3d 2 Hybridization
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Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.

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Related Experiment Video

Updated: May 8, 2026

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
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Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication

Published on: November 28, 2017

New layered fluorosulfide SrFBiS2.

Hechang Lei1, Kefeng Wang, Milinda Abeykoon

  • 1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory , Upton, New York 11973, United States.

Inorganic Chemistry
|August 31, 2013
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a new layered bismuth-sulfide (BiS2) compound, SrFBiS2. This semiconductor exhibits properties suggesting it could be a parent compound for novel superconductors.

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Condensed Matter Physics

Background:

  • Layered bismuth-sulfide (BiS2) compounds are of interest due to their potential superconducting properties.
  • The compound LaOBiS2 is a known superconductor with fluoride doping.

Purpose of the Study:

  • To synthesize and characterize a new layered BiS2-based compound, SrFBiS2.
  • To investigate the electronic and thermal transport properties of SrFBiS2.
  • To explore the potential of SrFBiS2 as a precursor for new superconductors.

Main Methods:

  • Synthesis of the SrFBiS2 compound.
  • Electrical transport measurements.
  • Thermal transport measurements.
  • First-principle calculations.

Main Results:

  • SrFBiS2 was successfully synthesized as a layered compound, structurally analogous to LaOBiS2.
  • Electrical transport measurements confirmed SrFBiS2 as a semiconductor.
  • Thermal transport measurements revealed low thermal conductivity and a high Seebeck coefficient.
  • First-principle calculations supported experimental findings and highlighted structural similarities to LaOBiS2.

Conclusions:

  • SrFBiS2 is a semiconductor with promising thermoelectric properties.
  • The structural and electronic similarities to LaOBiS2 suggest SrFBiS2 could be a parent compound for novel superconductors.
  • Further research into doping SrFBiS2 may lead to the discovery of new superconducting materials.