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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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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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Properties of Transition Metals02:58

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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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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Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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Electrophilic Addition to Alkynes: Halogenation02:38

Electrophilic Addition to Alkynes: Halogenation

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Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
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Updated: Jun 16, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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A Thorium(IV) metallacyclopropyne complex.

Xiuting Chen1, Songpeng Wan1,2, Qian Wang1,2

  • 1Key Laboratory of Thorium Energy, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China.

Nature Communications
|August 20, 2024
PubMed
Summary
This summary is machine-generated.

Researchers prepared a novel thorium metallacyclopropyne complex in the gas phase. This discovery advances understanding of highly reactive actinide metallacycles, revealing a triple bond and significant thorium 5f orbital involvement in bonding.

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Area of Science:

  • Organometallic Chemistry
  • Actinide Chemistry
  • Gas-Phase Chemistry

Background:

  • Actinide metallacyclic chemistry is crucial but poorly understood for highly reactive species.
  • Knowledge is limited to metallacyclopropenes, with little known about metallacyclopropynes.

Purpose of the Study:

  • To synthesize and characterize a thorium metallacyclopropyne complex.
  • To investigate the structure, bonding, and reactivity of this novel species.

Main Methods:

  • Electrospray ionization mass spectrometry (ESI-MS) for gas-phase complex generation.
  • Collision-induced dissociation (CID) of propynoate precursors.
  • Reactivity experiments and theoretical calculations (DFT).

Main Results:

  • Successful preparation of a thorium metallacyclopropyne complex, (η²-C≡C)ThCl₃⁻.
  • Established a dianionic C₂²⁻ ligand coordinated side-on to Th(IV).
  • Demonstrated a triple bond between carbon atoms and significant Th 5f orbital participation in bonding.

Conclusions:

  • The structure of (η²-C≡C)ThCl₃⁻ is confirmed as a thorium metallacyclopropyne.
  • This work expands the known scope of actinide metallacyclic chemistry.
  • Provides fundamental insights into the bonding of highly reactive actinide complexes.