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Related Concept Videos

Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
Chain Reactions01:29

Chain Reactions

Chain reactions involve highly reactive transient species, such as atoms or free radicals, as intermediates. These intermediates facilitate rapid reactions over an extended period. The process includes a series of steps: a reactive intermediate is consumed, reactants are converted to products, and the intermediate is regenerated. This cycle enables continuous repetition, amplifying the production of products with a small amount of intermediate. Chain reactions often utilize free radicals as...
Molecular Orbital Theory II03:51

Molecular Orbital Theory II

Molecular Orbital Energy Diagrams
Alkyl Halides02:45

Alkyl Halides

Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...
Ionic Bonding and Electron Transfer02:48

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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Updated: May 8, 2026

A Protocol for Safe Lithiation Reactions Using Organolithium Reagents
09:45

A Protocol for Safe Lithiation Reactions Using Organolithium Reagents

Published on: November 12, 2016

Modified Li chains as atomic switches.

Thomas Wunderlich1, Berna Akgenc, Ulrich Eckern

  • 1Institut für Physik, Universität Augsburg, Augsburg, Germany.

Scientific Reports
|September 7, 2013
PubMed
Summary
This summary is machine-generated.

Impurities in hydrogen and lithium chains can alter electronic properties, potentially switching materials between metallic and insulating states. These effects depend on impurity configuration and electronegativity.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Chemistry

Background:

  • Understanding the electronic properties of low-dimensional materials like atomic chains is crucial for future electronics.
  • Impurities can significantly modify material properties, but their effects on simple chains require systematic investigation.

Purpose of the Study:

  • To investigate how impurities affect the electronic structure and transport properties of hydrogen and lithium chains.
  • To determine the conditions under which impurities can induce transitions between metallic and insulating states.

Main Methods:

  • Density functional theory (DFT) for electronic structure calculations.
  • Green's function-based scattering theory for transport calculations.
  • Tight-binding models for interpreting results.

Main Results:

  • Analyzed various impurity configurations in hydrogen and lithium chains.
  • Identified circumstances leading to level splitting and metallic-insulating transitions.
  • Investigated the impact of strongly electronegative impurities.

Conclusions:

  • Impurities offer a mechanism to tune the electronic and transport characteristics of atomic chains.
  • The precise effect of impurities depends on their type, position, and interaction with the host chain.