Related Experiment Video
Updated: Apr 20, 2026
10:51
The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
12.9K
Dinuclear first-row transition metal complexes with a naphthyridine-based dinucleating ligand
1Department of Chemistry, University of California, Berkeley, CA 94720-1460, USA.
Dalton Transactions (Cambridge, England : 2003)
|November 25, 2014
Summary
Researchers synthesized novel dinuclear and tetranuclear transition metal complexes using the DPFN ligand. These complexes feature a unique "diamond" structure with potential applications in catalyst design.
Area of Science:
- Coordination Chemistry
- Organometallic Chemistry
- Materials Science
Background:
- The development of novel metal complexes is crucial for advancing catalysis and materials science.
- Dinucleating ligands offer unique structural motifs for creating polynuclear metal centers.
- The 1,8-naphthyridine scaffold provides a rigid framework for controlling metal-metal distances and coordination environments.
Purpose of the Study:
- To synthesize and characterize novel dinuclear and tetranuclear first-row transition metal complexes.
- To investigate the structural features and coordination geometries enforced by the 2,7-bis(di(2-pyridyl)fluoromethyl)-1,8-naphthyridine (DPFN) ligand.
- To explore the potential of these complexes in catalyst design due to their open coordination sites.
Main Methods:
- Synthesis of dinuclear and tetranuclear transition metal complexes.
- Structural characterization using X-ray crystallography to determine metal-metal distances and coordination geometries.
- Electronic spectroscopy, electrochemistry, and potentiometric titration to analyze the electronic properties and reactivity of the complexes.
Main Results:
- Successful synthesis of dinuclear and tetranuclear transition metal complexes featuring a "diamond" shaped core.
- The DPFN ligand enforces pseudo-octahedral geometries with chloro, hydroxo, and aqua bridging ligands.
- Metal-metal distances ranged from 2.7826(5) to 3.2410(11) Å.
- Dinuclear complexes exhibit an open coordination site suitable for terminal ligand binding in a syn geometry.
Conclusions:
- The DPFN ligand is effective in constructing well-defined dinuclear and tetranuclear transition metal complexes.
- The observed structural motifs and electronic properties suggest potential for these complexes in catalytic applications.
- Further studies are warranted to explore the catalytic activity and functional properties of these novel metal complexes.
More Related Videos
Related Concept Videos
02:57Coordination Number and Geometry
20.2K
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.
20.2K
02:51Metal-Ligand Bonds
25.9K
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...
25.9K
02:42Valence Bond Theory
11.9K
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...
11.9K
01:19Complexation Equilibria: The Chelate Effect
1.7K
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...
1.7K
03:02Colors and Magnetism
14.9K
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...
14.9K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
50.2K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
50.2K