Related Experiment Video
Updated: May 16, 2026
08:25
Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks (MOFs)
Published on: January 17, 2020
Chiral one-dimensional O-P-O bridged Mn(III)-Schiff base complexes
Ting-Ting Wang1, Song-Song Bao, Jian Huang
1State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China.
Dalton Transactions (Cambridge, England : 2003)
|November 22, 2012
Summary
Chiral metal phosphonates with manganese(III) were synthesized. These optically active compounds exhibit second harmonic generation and antiferromagnetic interactions, paving the way for new functional materials.
Area of Science:
- Coordination Chemistry
- Materials Science
- Chiral Materials
Background:
- Chiral metal phosphonates are of interest for their unique optical and magnetic properties.
- Schiff base complexes offer versatile platforms for designing metal-organic frameworks.
Purpose of the Study:
- To synthesize enantiomerically pure metal phosphonates using chiral manganese(III)-Schiff base precursors.
- To investigate the structural, optical, and magnetic properties of the synthesized compounds.
Main Methods:
- Synthesis of chiral manganese(III)-Schiff base mononuclear precursors.
- Crystallization and structural characterization of metal phosphonate compounds.
- Optical activity measurements and second harmonic generation (SHG) testing.
- Magnetic susceptibility measurements.
Main Results:
- Two pairs of enantiomerically pure metal phosphonates were successfully synthesized.
- The compounds exhibit one-dimensional chain structures with bridging phosphonate ligands.
- All synthesized compounds are optically active and show notable second harmonic generation responses.
- Magnetic measurements indicate dominant antiferromagnetic interactions between manganese(III) centers.
Conclusions:
- The study demonstrates the successful synthesis of chiral metal phosphonates with potential nonlinear optical properties.
- The observed magnetic behavior suggests antiferromagnetic coupling, relevant for magnetic materials design.
- These findings contribute to the development of novel chiral functional materials.
Related Concept Videos
02:52Stereoisomerism
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...
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...
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...
02:30Chirality at Nitrogen, Phosphorus, and Sulfur
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
02:57Coordination 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.
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...
01:19Complexation Equilibria: The Chelate Effect
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...