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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

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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.
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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...

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...

Complexation Equilibria: Factors Influencing Stability of Complexes

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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...

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

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Functional mixed metal-organic frameworks with metalloligands.

Madhab C Das¹, Shengchang Xiang, Zhangjing Zhang

¹Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249-0698, USA.

Angewandte Chemie (International Ed. in English)

|September 20, 2011

Summary

The metalloligand approach enables rational immobilization of functional sites within mixed metal-organic frameworks (M

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Area of Science:

Materials Science
Chemistry

Background:

Immobilizing functional sites in metal-organic frameworks (MOFs) is crucial for molecular recognition and material properties.
The metalloligand strategy allows for the rational design and incorporation of diverse functional moieties into MOFs.

Purpose of the Study:

To review the development and applications of mixed metal-organic frameworks (M'MOFs) synthesized using the metalloligand approach.
To highlight the versatility of M'MOFs for various applications including gas storage, separation, catalysis, and biomedical uses.

Main Methods:

Utilizing the metalloligand approach to construct M'MOFs with specific functional sites.
Synthesizing M'MOFs with open metal sites, catalytic centers, photoactive units, chiral environments, and tunable pore characteristics.

Main Results:

Demonstrated successful immobilization of diverse functional sites within M'MOFs.
Showcased M'MOFs' efficacy in gas storage and separation, enantioselective separation, and heterogeneous asymmetric catalysis.
Highlighted M'MOFs' potential as sensors, photoactive materials, and in nanoscale drug delivery and biomedical imaging.

Conclusions:

The metalloligand approach is a powerful strategy for creating functional M'MOFs.
M'MOFs exhibit significant promise across a wide spectrum of advanced applications.