Related Experiment Video
Updated: May 29, 2026
10:51
The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Can a meso-type dinuclear complex be chiral?: dinuclear β-diketonato Ru(III) complexes
Hisako Sato1, Ryoichi Takase, Yukie Mori
1Graduated School of Science and Engineering, Ehime University, Matsuyama, Ehime 790-8577, Japan. sato.hisako.my@ehime-u.ac.jp
Dalton Transactions (Cambridge, England : 2003)
|September 8, 2011
Summary
New dinuclear ruthenium(III) complexes were synthesized. One complex exhibited chirality in its bridging ligand due to the twisting of non-symmetrical diketonato moieties, confirmed by chromatographic resolution.
Area of Science:
- Coordination Chemistry
- Organometallic Chemistry
- Crystallography
Background:
- Dinuclear ruthenium(III) complexes offer unique structural and electronic properties.
- The synthesis and characterization of novel metal complexes are crucial for advancing materials science.
- Chirality in metal complexes can lead to applications in asymmetric catalysis and sensing.
Purpose of the Study:
- To synthesize and characterize two novel dinuclear ruthenium(III) complexes with different bridging ligands.
- To investigate the structural features, particularly the origin of chirality, in these dinuclear complexes.
- To explore the impact of bridging ligand symmetry on the chirality of the dinuclear framework.
Main Methods:
- Synthesis of dinuclear ruthenium(III) complexes using [Ru(acac)(2)(CH(3)CN)(2)]PF(6) and specific β-diketones.
- X-ray structural analysis to determine the precise molecular geometry and stereochemistry.
- Chromatographic resolution to separate enantiomers and confirm the presence of optical antipodes.
Main Results:
- Two dinuclear ruthenium(III) complexes, [Ru(III)(acac)(2)(dabe)Ru(III)(acac)(2)] and [Ru(III)(acac)(2)(tbet)Ru(III)(acac)(2)], were successfully synthesized.
- X-ray analysis revealed that the bridging ligand in the dinuclear complex with 1,2-diacetyl-1,2-dibenzoylethane (dabe) induced chirality due to orthogonal twisting of non-symmetrical moieties.
- The dinuclear complex with symmetrical 1,1,2,2-tetrabenzoylethane (tbet) bridging ligand did not exhibit chirality in the bridging part.
- Chromatographic resolution confirmed the existence of optical antipodes for the chiral dinuclear complex.
Conclusions:
- The symmetry of the β-diketonato bridging ligand dictates the generation of chirality in dinuclear ruthenium(III) complexes.
- Dinuclear complexes with non-symmetrical bridging ligands can possess inherent chirality, leading to optical activity.
- This study provides insights into the design of chiral dinuclear metal complexes with potential applications in stereoselective processes.
More Related Videos
10:52Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
Published on: July 27, 2022
07:20Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
Published on: May 28, 2014
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...
02:25Molecules with Multiple Chiral Centers
Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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.
02:34Structural 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...
02:33Stereoisomerism of Cyclic Compounds
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...