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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

1.1K
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.
1.1K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.9K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
2.9K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

602
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...
602
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

2.9K
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
2.9K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

1.1K
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...
1.1K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

451
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
451

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Updated: Aug 22, 2025

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Metallaaromaticity - a protean world.

Ben Joseph R Cuyacot1, Zahra Badri1, Abhik Ghosh2

  • 1Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland. cforoutan-nejad@icho.edu.pl.

Physical Chemistry Chemical Physics : PCCP
|November 14, 2022
PubMed
Summary

Magnetically induced current densities reveal complex aromaticity in metallabenzenes. The study proposes a unified definition of aromaticity requiring confirmation from all criteria, not just magnetic or ground-state properties.

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Area of Science:

  • Computational chemistry
  • Quantum chemistry
  • Materials science

Background:

  • Metallabenzenes exhibit diverse electronic properties.
  • Magnetic aromaticity is a key concept in understanding molecular magnetism.
  • Relativistic DFT calculations are crucial for accurate electronic structure analysis.

Purpose of the Study:

  • To investigate magnetically induced current densities (MICD) in metallabenzenes.
  • To analyze the origin of MICD from molecular orbital contributions.
  • To assess and define magnetic aromaticity in these systems.

Main Methods:

  • Relativistic Density Functional Theory (DFT) calculations.
  • Analysis of individual molecular orbital (MO) contributions to MICD.
  • Examination of σ- and π-electron frameworks.

Main Results:

  • The σ-framework consistently contributes diamagnetically to MICD.
  • π-MOs and Craig-Möbius type π-MOs may not always yield diatropic contributions.
  • Multiple magnetic aromaticities were identified, with metal oxidation states and neighboring rings significantly influencing aromaticity.

Conclusions:

  • A unified definition of aromaticity is proposed, requiring consensus from magnetic, energetic, structural, and electronic criteria.
  • Minor ligand perturbations can substantially alter metallaaromaticity.
  • Further investigations into metallabenzenes and related compounds are warranted.