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Properties of Organometallic Compounds

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.

Metal-Ligand Bonds

Metal-Ligand Bonds

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...

Complexation Equilibria: The Chelate Effect

Complexation Equilibria: The Chelate Effect

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...

Complexation Equilibria: Factors Influencing Stability of Complexes

Complexation Equilibria: Factors Influencing Stability of Complexes

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...

Complexometric Titration: Ligands

Complexometric Titration: Ligands

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...

Valence Bond Theory

Valence Bond Theory

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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Related Experiment Video

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Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers

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Metallocavitands: an emerging class of functional multimetallic host molecules.

Peter D Frischmann¹, Mark J MacLachlan

¹Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1.

Chemical Society Reviews

|November 29, 2012

Summary

Metallocavitands, multimetallic complexes crucial for cavity formation, are a new frontier in supramolecular chemistry. This review defines them and explores their synthesis and diverse supramolecular applications.

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Area of Science:

Supramolecular Chemistry
Coordination Chemistry
Organic Chemistry

Background:

Traditional organic cavitands are foundational in supramolecular chemistry.
A new class, metallocavitands, is emerging with significant structural diversity.
A unifying definition is needed for metallocavitand research.

Purpose of the Study:

To define metallocavitands as multimetallic complexes requiring metal coordination for cavity formation.
To provide a foundation for future research in this area.
To highlight synthetic strategies and observed supramolecular phenomena.

Main Methods:

Exploration of synthetic routes.
Focus on self-assembly strategies.
Utilizing macrocycle-templating strategies.

Main Results:

Isolation of bowl-shaped metallocavitands.
Observation of supramolecular phenomena including dimerization and host-guest encapsulation.
Demonstration of catalysis, regioselective reactivity, and enantioselective guest recognition.

Conclusions:

Metallocavitands represent a significant advancement in supramolecular chemistry.
Their defined structure and versatile properties open new avenues for research.
Further investigation into metallocavitands promises novel applications in molecular recognition and catalysis.