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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...

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...

Coordination Number and Geometry

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.

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...

Colors and Magnetism

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...

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...

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Related Experiment Video

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Gold and Silver Chains Supported by Linear Hexaphosphine Ligands.

Tomoaki Tanase¹, Mio Chikanishi², Konomi Morita²

¹Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya-nishi-machi, Nara, 630-8506, Japan. tanase@cc.nara-wu.ac.jp.

Chemistry, an Asian Journal

|September 12, 2015

Summary

A novel linear hexaphosphine ligand (P6) was synthesized, enabling the construction of flexible hexanuclear gold and silver metal chains. These metal clusters exhibit unique optical properties, serving as potential subnano building blocks.

Keywords:

gold hexanuclear metal chains linear hexaphosphine phosphorescence silver

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Published on: May 28, 2014

Area of Science:

Inorganic Chemistry
Coordination Chemistry
Materials Science

Background:

Linear phosphine ligands are crucial for constructing metal clusters.
Designing flexible ligands is key to organizing metal ions into specific architectures.

Purpose of the Study:

To synthesize and characterize a new linear hexaphosphine ligand.
To explore the coordination behavior of this hexaphosphine with gold(I) and silver(I) ions.
To investigate the structural and photophysical properties of the resulting metal complexes.

Main Methods:

Synthesis and isolation of the linear hexaphosphine ligand (P6).
Characterization of the ligand and its metal complexes using spectroscopic and crystallographic techniques.
Formation of hexanuclear gold(I) and silver(I) chains and a tetrasilver(I) complex.

Main Results:

Successful synthesis of a pure isomer of the linear hexaphosphine ligand.
Organization of flexible hexanuclear gold(I) and silver(I) chains with distinct P6 arrangements.
Observation of red-shifted absorption and emission in hexagold(I) chains due to metal-centered electronic transitions.

Conclusions:

The new linear hexaphosphine is a versatile ligand for constructing metal clusters.
The ligand facilitates the formation of flexible and tunable metal chain architectures.
These metal clusters show potential as sub-nanoscale building blocks for advanced materials.