Related Experiment Video
Updated: May 11, 2026
13:21
Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
Published on: July 21, 2011
15.0K
Potential antiprostatic performance of novel lanthanide-complexes based on 5-nitropicolinic acid
Amalia García-García1, Pablo Cristobal-Cueto2, Tania Hidalgo2
1Department of Inorganic Chemistry, Faculty of Science, University of Granada, Av. Fuente Nueva S/N, 18071, Granada, Spain.
Summary
Two novel lanthanide complexes featuring the 5-nitropicolinate ligand show significant anticancer activity against prostate cancer cells. These complexes exhibit good biocompatibility, with the ligand itself driving the observed antitumoral effects.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Medicinal Chemistry
Background:
- Lanthanide complexes are explored for their unique properties and potential applications.
- The 5-nitropicolinate (5-npic) ligand is investigated for its role in complex formation and biological activity.
- Prostate cancer remains a significant global health challenge, necessitating novel therapeutic strategies.
Purpose of the Study:
- To synthesize and characterize new lanthanide complexes using the 5-nitropicolinate ligand.
- To evaluate the photoluminescent properties of the synthesized complexes.
- To assess the potential antitumoral activity and biocompatibility of these complexes and the ligand.
Main Methods:
- Synthesis and full characterization of lanthanide complexes.
- Single-crystal X-ray diffraction for structural elucidation.
- Photoluminescence spectroscopy.
- In vitro assays on prostate cancer cell line (PC-3) and human immunological HL-60 cells.
Main Results:
- Two isostructural lanthanide complexes, [Ln 2(5-npic)6(H2O)4]·(H2O)2 (Ln = Dy, Gd, Tb), were successfully synthesized.
- Complexes displayed ligand-centered emission.
- Significant anticancer activity (50-60%) was observed in PC-3 cells at 500 μg·mL-1, with high biocompatibility in HL-60 cells.
- The free 5-nitropicolinate ligand demonstrated a notable toxic effect (40-50%) on tumoral cells.
Conclusions:
- The synthesized lanthanide complexes exhibit promising anticancer properties against prostate cancer.
- The 5-nitropicolinate ligand appears to be the primary driver of the observed antitumoral effects.
- These findings suggest potential for developing new metallodrugs based on lanthanide-5-npic systems.
Keywords:
5-Nitropicolinic acidCoordination compoundsLanthanideProstate cancerSingle-crystal X-ray diffractionMore Related Videos
Related Concept Videos
02:51Metal-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...
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...
02:34Structural 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...
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...
02:42Valence 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...
03:02Colors 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 eye.
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 eye.
01:22EDTA: Chemistry and Properties
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
00:43Complexometric Titration: Ligands
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...