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Related Concept Videos

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...
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...
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...
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 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.
Stereoisomerism02:52

Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...

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The first structurally characterized coordination compounds with homocysteine.

Masahiro Kouno1,2, Takumi Konno1,3, Naoto Kuwamura4

  • 1The University of Osaka, 1-1 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan. nobuto@chem.sci.osaka-u.ac.jp.

Chemical Communications (Cambridge, England)
|July 2, 2026
PubMed
Summary
This summary is machine-generated.

This study details the synthesis of novel S-bridged cobalt-palladium complexes using D-homocysteine. The research highlights the selective formation of these unique metal coordination compounds.

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Area of Science:

  • Coordination chemistry
  • Organometallic chemistry
  • Bioinorganic chemistry

Background:

  • Homocysteine is an important amino acid with biological relevance.
  • Cobalt and palladium complexes have diverse applications in catalysis and medicine.
  • Understanding metal coordination modes is crucial for designing new functional materials.

Purpose of the Study:

  • To synthesize and characterize novel S-bridged cobalt-palladium complexes.
  • To investigate the coordination behavior of D-homocysteine with cobalt and palladium.
  • To explore the selective formation of complexes using racemic mixtures.

Main Methods:

  • Coordination of D-homocysteine to Co(III) centers.
  • Formation of S-bridged Co2Pd complexes.
  • Synthesis using racemic D/L-homocysteine.

Main Results:

  • A tridentate N,O,S coordination of D-homocysteine to Co(III) was achieved.
  • An S-bridged Co2Pd complex featuring two trans(N)-[Co(D-hcys)2]- units was synthesized.
  • Selective isolation of an analogous complex using racemic D/L-homocysteine was successful.

Conclusions:

  • D-homocysteine acts as a tridentate ligand in cobalt coordination complexes.
  • Novel S-bridged Co2Pd complexes can be selectively synthesized.
  • The stereochemistry of homocysteine influences the final complex structure.