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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...

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...

Stereoisomerism

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...

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.

Basicity of Heterocyclic Aromatic Amines

Basicity of Heterocyclic Aromatic Amines

Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).

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...

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Related Experiment Video

Updated: Jun 13, 2025

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

Copper(II) Methacrylate Complexes with Imidazole Derivatives-Structural, Spectral and Antitumor Features.

Dragoș Vlad Teodoru¹, Rodica Olar¹, Cătălin Maxim¹

¹Department of Inorganic and Organic Chemistry, Biochemistry and Catalysis, Faculty of Chemistry, University of Bucharest, 90-92 Panduri Str., 050663 Bucharest, Romania.

Molecules (Basel, Switzerland)

|September 14, 2024

Summary

Five novel copper(II) complexes with imidazole derivatives were synthesized and characterized. These complexes showed promising activity against melanoma cells without harming healthy cells, with the 2-isopropylimidazole complex being the most effective.

Keywords:

copper complex crystal structure imidazole derivative methacrylate mouse melanoma cells

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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

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Published on: September 7, 2019

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents

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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

Area of Science:

Coordination Chemistry
Materials Science
Biomedical Research

Background:

Imidazole derivatives are known for their diverse biological activities.
Copper complexes often exhibit interesting catalytic and medicinal properties.
Developing novel metal complexes for therapeutic applications is an active area of research.

Purpose of the Study:

To synthesize and characterize novel copper(II) complexes with various imidazole derivatives.
To investigate the structural properties and supramolecular assembly of these complexes.
To evaluate the cytotoxic activity of the synthesized complexes and their ligands against B16 murine melanoma cells.

Main Methods:

Synthesis and characterization using elemental analysis, FTIR, electronic spectroscopy, cyclic voltammetry, and thermal analysis.
Single crystal X-ray diffraction to determine the crystal structure and stereochemistry.
In vitro cytotoxicity assays on B16 murine melanoma cells and healthy BJ cells.

Main Results:

Five novel copper(II) complexes with the general core Cu(R-Im)2(Macr)2 were successfully synthesized.
All complexes exhibited a distorted octahedral geometry, except for the 4-methylimidazole complex which showed square-pyramidal geometry.
All synthesized compounds demonstrated significant inhibition of B16 murine melanoma cells in the micromolar range, with the 2-isopropylimidazole complex showing the highest activity. No toxicity was observed in healthy BJ cells.

Conclusions:

The study successfully synthesized and characterized novel copper(II) complexes with potential anticancer properties.
The structural diversity and cytotoxic activity were correlated, highlighting the role of imidazole substituents.
The 2-isopropylimidazole copper(II) complex shows promise as a lead compound for further investigation in melanoma treatment.