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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Colors and Magnetism03:02

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 eye.
Complexation Equilibria: The Chelate Effect01:19

Complexation 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...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
Valence Bond Theory02:42

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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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

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Copper chalcogenide clusters stabilized with ferrocene-based diphosphine ligands.

Chhatra B Khadka1, Bahareh Khalili Najafabadi, Mahdi Hesari

  • 1Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7.

Inorganic Chemistry
|May 28, 2013
PubMed
Summary
This summary is machine-generated.

This study synthesizes novel copper chalcogenide clusters stabilized by the redox-active 1,1'-bis(diphenylphosphino)ferrocene (dppf) ligand. These clusters exhibit unique structural features and interesting redox properties, expanding the scope of organometallic chemistry.

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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

Published on: December 29, 2016

Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Copper chalcogenide clusters are of interest due to their unique electronic and structural properties.
  • The redox-active diphosphine ligand 1,1'-bis(diphenylphosphino)ferrocene (dppf) offers potential for stabilizing novel cluster architectures.
  • Exploring new synthetic routes to metal chalcogenide complexes is crucial for advancing materials science.

Purpose of the Study:

  • To synthesize and characterize novel copper(I) chalcogenide clusters stabilized by the dppf ligand.
  • To investigate the structural features and coordination modes of these new cluster complexes.
  • To explore the redox chemistry of the synthesized copper chalcogenide clusters.

Main Methods:

  • Synthesis of copper(I) chalcogenide clusters via reaction of (dppf)CuOAc with E(SiMe3)2 (E = S, Se, Te).
  • Single-crystal X-ray diffraction analysis to determine the structures of the complexes.
  • Cyclic voltammetry to study the redox properties of the synthesized clusters and compare them to the free ligand and precursor complex.

Main Results:

  • Four novel copper(I) chalcogenide clusters stabilized by dppf ligands were successfully synthesized: [Cu12(μ4-S)6(μ-dppf)4] (1), [Cu8(μ4-Se)4(μ-dppf)3] (2), [Cu4(μ4-Te)(μ4-η(2)-Te2)(μ-dppf)2] (3), and [Cu12(μ5-Te)4(μ8-η(2)-Te2)2(μ-dppf)4] (4).
  • X-ray crystallography confirmed the presence of {Cu(2x)E(x)} cores with bridging dppf ligands.
  • Cluster 1 exhibited expected consecutive oxidations of ferrocene moieties, Cu(I) centers, and the phosphine component of the dppf ligand.

Conclusions:

  • The redox-active dppf ligand effectively stabilizes diverse copper(I) chalcogenide cluster structures.
  • The synthesized clusters possess unique structural motifs with bridging dppf ligands.
  • The redox behavior of the clusters is influenced by the interplay between the copper centers, chalcogenide framework, and the dppf ligand.