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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...

Coordination Compounds and Nomenclature

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...

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.

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 eye.

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...

Structural Isomerism

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...

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Updated: Jun 24, 2026

Biofunctionalization of Magnetic Nanomaterials

Biofunctionalization of Magnetic Nanomaterials

Published on: July 16, 2020

Functional coordination nanoparticles.

Laure Catala¹, Florence Volatron, Daniela Brinzei

¹Institut de Chimie Moleculaire et des Materiaux d'Orsay, CNRS, Universite Paris-Sud 11, 91405 Orsay, France.

Inorganic Chemistry

|April 14, 2009

Summary

This summary is machine-generated.

Coordination nanoparticles (CNPs) are novel nanoscale materials offering tunable magnetic properties. Researchers have developed light- and temperature-responsive CNPs, showcasing their potential for advanced functionalities.

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Published on: July 9, 2015

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Biofunctionalization of Magnetic Nanomaterials

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Published on: July 16, 2020

Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

Published on: July 9, 2015

Area of Science:

Materials Science
Nanotechnology
Chemistry

Background:

Intense research focuses on designing nanoscale objects with useful functionalities.
Coordination nanoparticles (CNPs) have emerged recently, enabling molecule-based bistable objects.
External stimuli like light, temperature, or magnetic fields can control CNP properties.

Purpose of the Study:

To explore the potential of magnetic cyanide-bridged networks in forming nanoparticles.
To investigate the creation of bistable nanoparticles with tunable magnetic properties.
To demonstrate the development of luminescent CNPs.

Main Methods:

Synthesis of magnetic cyanide-bridged networks.
Shaping these networks into nanoparticles.
Characterization of nanoparticle properties, including light and temperature response.
Investigation of luminescence properties.

Main Results:

Successfully shaped magnetic cyanide-bridged networks into nanoparticles.
Discovered light- and temperature-induced bistable nanoparticles.
Prepared luminescent coordination nanoparticles.
Demonstrated the tunability of magnetic properties in CNPs.

Conclusions:

Coordination nanoparticles offer significant potential for designing advanced functional materials.
CNPs can exhibit bistable magnetic behavior controllable by external stimuli.
The development of luminescent CNPs highlights their versatility.