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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...

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 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.

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

Protein Folding

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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...

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Related Experiment Video

Updated: Aug 31, 2025

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

Published on: December 16, 2013

Orchestrating copper binding: structure and variations on the cupredoxin fold.

Jing Guo¹, Oriana S Fisher²

¹Department of Chemistry, Lehigh University, Bethlehem, PA, USA.

Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry

|August 22, 2022

Summary

This summary is machine-generated.

The cupredoxin domain is a versatile protein fold that binds copper ions for diverse functions, including electron transfer and catalysis. Structural variations enable distinct properties and biological roles beyond blue copper proteins.

Keywords:

Copper Cupredoxin Domain Protein structure

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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

Published on: September 7, 2019

Area of Science:

Biochemistry
Structural Biology
Bioinorganic Chemistry

Background:

The cupredoxin domain is a conserved three-dimensional fold utilized by numerous copper-binding proteins.
Initially identified in Type 1 blue copper centers, this domain architecture is now recognized in a broader range of copper-binding proteins.

Purpose of the Study:

To explore the structural basis of copper ion coordination by cupredoxin domains.
To examine the relationship between structural variations in cupredoxin domains and their diverse biological functions and spectroscopic properties.

Main Methods:

Structural analysis of cupredoxin domains and their copper-binding sites.
Comparative study of protein structures to understand functional diversity.

Main Results:

The cupredoxin fold provides a stable structural core for copper ion coordination.
Variations in the metal-binding site's coordination environment dictate copper-binding affinities, redox potentials, and spectroscopic characteristics.
Cupredoxin domains are employed in various biological processes, including electron transfer, enzyme catalysis, and copper sequestration.

Conclusions:

The cupredoxin domain is a highly adaptable structural motif for copper ion binding, extending its roles beyond blue copper proteins.
Understanding the structure-function relationships of cupredoxin domains is crucial for elucidating copper's biological roles and for identifying novel copper-binding proteins.