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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

2.1K
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.
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
19.3K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
2.5K
Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

10.1K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
10.1K

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A Protocol for Safe Lithiation Reactions Using Organolithium Reagents
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A Protocol for Safe Lithiation Reactions Using Organolithium Reagents

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A dimethylgallium boryl complex and its methyllithium addition compound.

Nicole Dettenrieder1, Christoph Schädle, Cäcilia Maichle-Mössmer

  • 1Institut für Anorganische Chemie, Auf der Morgenstelle 18, 72076 Tübingen, Germany.

Journal of the American Chemical Society
|January 11, 2014
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a novel gallium-boron complex with a short Ga-B bond. Further reactions yielded a unique tetrameric "nanowheel" structure, expanding organometallic chemistry.

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Materials Science

Background:

  • The synthesis and characterization of novel organometallic complexes are crucial for advancing chemical understanding and applications.
  • Gallium-boron chemistry offers unique bonding possibilities and potential for new materials.

Purpose of the Study:

  • To synthesize and characterize a new three-coordinate gallium-boron complex.
  • To investigate the structural and electronic properties of the Ga-B bond.
  • To explore the reactivity of the synthesized complex with organolithium reagents.

Main Methods:

  • Tandem Lewis acid-base metathesis using lithium borate and trimethylgallium.
  • Single-crystal X-ray diffraction for structural determination.
  • Density Functional Theory (DFT) calculations for electronic structure analysis.

Main Results:

  • Successful synthesis of the three-coordinate complex Me2Ga[B(NArCH)2].
  • Observation of a remarkably short Ga-B bond (2.067(3) Å) supported by DFT analysis.
  • Formation of a tetrameric "nanowheel" structure, [LiMe3Ga{B(NArCH)2}]4, upon reaction with methyllithium.

Conclusions:

  • The study demonstrates a facile route to novel gallium-boron compounds.
  • The short Ga-B bond highlights unique electronic interactions within the complex.
  • The formation of the tetrameric nanowheel structure opens avenues for supramolecular chemistry and cluster synthesis.