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Related Concept Videos

Valence Bond Theory02:42

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 Compounds and Nomenclature02:54

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 Geometry02:57

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.
Metal-Ligand Bonds02:51

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...
Crystal Field Theory - Octahedral Complexes02:58

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...
Structural Isomerism02:34

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 27, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
10:57

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

Atomic-Site Coordination Tuning for Precise CO2 Electroconversion.

Tianshang Shan1,2, Gengxian Zhou3,2, Hongpan Rong1

  • 1School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, China.

Precision Chemistry
|June 26, 2026
PubMed
Summary
This summary is machine-generated.

Single-atom site catalysts (SASCs) offer a precise way to tune electrochemical carbon dioxide reduction (ECR) for carbon neutrality. This review details their synthesis, characterization, and structure-activity relationships for efficient fuel production.

Keywords:
Carbon neutralityCoordination environmentElectrochemical CO2 reductionElectronic structurePrecise synthesisSingle-atom site catalysisStructure−activity relationship

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Area of Science:

  • Catalysis
  • Electrochemistry
  • Materials Science

Background:

  • Electrochemical carbon dioxide reduction (ECR) is key to carbon neutrality, converting CO2 into valuable products.
  • Developing highly active, selective, and stable catalysts is crucial for ECR advancement.
  • Single-atom site catalysts (SASCs) provide maximum atom efficiency and tunable active sites for ECR.

Purpose of the Study:

  • To systematically review synthesis strategies for SASCs in ECR.
  • To explore advanced characterization techniques for SASCs.
  • To elucidate structure-activity relationships of SASCs with varying coordination environments.

Main Methods:

  • Summarizing precise synthesis methods for SASCs.
  • Reviewing advanced characterization techniques for analyzing SASCs.
  • Analyzing structure-activity relationships based on coordination environments.

Main Results:

  • SASCs enable precise tuning of active sites through coordination environments.
  • Understanding these relationships is vital for selective ECR product synthesis.
  • Current characterization methods have limitations and require careful consideration.

Conclusions:

  • SASCs are a powerful platform for optimizing ECR catalysts.
  • Further research into synthesis, characterization, and structure-activity is needed.
  • Addressing limitations in characterization will accelerate ECR technology development.