Related Experiment Video
Updated: Jan 9, 2026
07:20
Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
Published on: May 28, 2014
14.4K
Three cobalt(II) complexes containing pyrimidylanthrahydrazone ligands: Synthesis, crystal structure, DNA binding,
Jia-Yu Xu1, Xue-Bin Bi1, Sha-Sha Luo1
1Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), Guangxi Key Laboratory of Chemistry and Molecular Engineering of Medicinal Resources, University Engineering Research Center for Chemistry of Characteristic Medicinal Resources (Guangxi), School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China.
Journal of Inorganic Biochemistry
|December 3, 2025
Summary
Three novel cobalt(II) complexes were synthesized and evaluated for anticancer properties. The 9-PMAH-Co complex showed significant DNA interaction, topoisomerase I inhibition, and potent cytotoxicity against cancer cells with reduced toxicity to normal cells.
Area of Science:
- Inorganic Chemistry
- Medicinal Chemistry
- Molecular Biology
Background:
- Development of novel metal-based anticancer agents is crucial for overcoming drug resistance.
- Cobalt complexes have shown promise as therapeutic agents.
- Pyrimidylanthrahydrazone ligands offer versatile coordination possibilities.
Purpose of the Study:
- To design, synthesize, and characterize new pyrimidylanthrahydrazone cobalt(II) complexes.
- To evaluate their DNA interaction, topoisomerase I inhibition, and in vitro anticancer activities.
- To investigate their mechanism of action, including cell cycle arrest.
Main Methods:
- Single-crystal X-ray diffraction for structural determination.
- Spectroscopic methods for DNA interaction studies.
- Topoisomerase I inhibition assays.
- In vitro antiproliferative assays against cancer and normal cell lines.
- Cell cycle analysis.
Main Results:
- Three hexacoordinate mononuclear cobalt(II) complexes (9-MPMAH-Co, 9-FPMAH-Co, 9-PMAH-Co) were synthesized and characterized.
- All complexes exhibited DNA intercalation, with 9-PMAH-Co showing significant topoisomerase I inhibition at 1 μM.
- 9-PMAH-Co displayed potent cytotoxicity against SK-OV-3 and HeLa-229 cells (IC50 values 4.99 μM and 8.09 μM, respectively) and induced G2/M phase arrest in SK-OV-3 cells.
- Reduced toxicity was observed in normal liver cells (HL-7702) compared to cisplatin.
Conclusions:
- The synthesized cobalt complexes demonstrate promising anticancer activities.
- 9-PMAH-Co is identified as a lead compound due to its potent cytotoxic effects and favorable toxicity profile.
- Structural modifications of the ligand substituents significantly influence the biological activity of the cobalt complexes.
Related Concept Videos
02:34Structural Isomerism
21.4K
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...
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...
21.4K
02:42Valence Bond Theory
11.1K
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...
11.1K
02:58Crystal Field Theory - Octahedral Complexes
30.5K
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...
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...
30.5K
03:02Colors and Magnetism
13.9K
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...
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...
13.9K
02:51Metal-Ligand Bonds
23.9K
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...
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...
23.9K
02:57Coordination Number and Geometry
18.8K
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.
18.8K