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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...

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.

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...

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...

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Synthesis of a Water-soluble Metal–Organic Complex Array

Synthesis of a Water-soluble Metal–Organic Complex Array

Published on: October 8, 2016

Multicavity Metallosupramolecular Architectures.

Roan A S Vasdev¹, Dan Preston¹, James D Crowley¹

¹Department of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand.

Chemistry, an Asian Journal

|July 30, 2017

Summary

This summary is machine-generated.

This review explores multicavity metallosupramolecular architectures, which bind multiple guests simultaneously. These advanced host-guest systems offer exciting possibilities for catalysis, pollutant scavenging, and drug delivery applications.

Keywords:

allosterism host-guest metallosupramolecular multicavity self-assembly

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Area of Science:

Supramolecular Chemistry
Coordination Chemistry
Materials Science

Background:

Discrete metallosupramolecular systems feature cavities for encapsulating guest molecules.
Host-guest interactions within these systems drive interest and potential applications.
Applications include catalysis, pollutant scavenging, reactive species storage, and drug delivery.

Purpose of the Study:

To review multicavity metallosupramolecular architectures.
To examine strategies for creating multiple compartments within single assemblies.
To highlight key advancements in the field.

Main Methods:

Review of existing literature on metallosupramolecular assemblies.
Analysis of different approaches to constructing multicavity systems.
Identification of key contributions and methodologies.

Main Results:

Multicavity architectures combine concurrent multi-guest binding with specificity.
Approaches include interpenetrated cages, polytopic ligands, and cleft-containing molecules.
These systems offer enhanced capabilities over single-cavity counterparts.

Conclusions:

Multicavity metallosupramolecular architectures represent a significant advancement.
Diverse strategies enable the construction of complex, compartmentalized systems.
These systems hold substantial promise for various technological applications.