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Colors and Magnetism03:02

Colors and Magnetism

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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...
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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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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...
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Metal-Ligand Bonds02:51

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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...
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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...
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Cooperative Allosteric Transitions01:58

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Stereoisomerism02:52

Stereoisomerism

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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...
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Updated: Jun 12, 2025

[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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Tuning Co-Operative Energy Transfer in Copper(I) Complexes Using Two-Photon Absorbing Diimine-Based Ligand

Noémie Beaucage1, Zujhar Singh1, Jérémie Bourdon1

  • 1Noémie Beaucage, Dr. Zujhar Singh, Jérémie Bourdon and Prof. Dr. Shawn K. Collins, Department of Chemistry and Centre for Green Chemistry and Catalysis, Université de Montréal, 1375 Avenue Thérèse-Lavoie-Roux, Montréal.

Angewandte Chemie (International Ed. in English)
|September 18, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed novel copper complexes using a specialized ligand for two-photon upconversion. This advancement enables efficient photocatalysis under visible light, paving the way for greener chemical synthesis.

Keywords:
copperenergy transferphotocatalysisred lighttwo photon absoprtion

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Area of Science:

  • Photochemistry
  • Organometallic Chemistry
  • Sustainable Synthesis

Background:

  • Low-energy light photocatalysis offers safer and more sustainable synthetic routes.
  • Two-photon absorption (TPA) ligands are crucial for efficient light harvesting.
  • Copper complexes are versatile catalysts in organic transformations.

Purpose of the Study:

  • To synthesize and characterize novel copper complexes with a phenanthroline-derived ligand, bathocupSani.
  • To investigate the two-photon absorption and upconversion properties of these complexes.
  • To explore the application of these complexes in visible-light-mediated photocatalysis.

Main Methods:

  • Synthesis of bathocupSani ligand and its copper complexes ([Cu(bathocupSani)(DPEPhos)]BF4 and [Cu(bathocupSani)2]BF4).
  • Spectroscopic characterization including two-photon absorption cross-section determination.
  • Photocatalytic reactions utilizing red light irradiation.

Main Results:

  • The ligand and homoleptic copper complex [Cu(bathocupSani)2]BF4 exhibited efficient two-photon upconversion with a 1.2 eV anti-Stokes shift.
  • The [Cu(bathocupSani)2]BF4 complex demonstrated efficacy in various photocatalytic transformations.
  • Successful applications included oxidative dimerization of benzylic amines, sulfide, phosphine, and boronic acid oxidation, and atom-transfer radical addition.

Conclusions:

  • Copper complexes featuring the bathocupSani ligand are effective two-photon chromophores.
  • Visible-light photocatalysis using these complexes provides a sustainable alternative for diverse organic reactions.
  • The developed system highlights the potential of TPA materials in advancing green chemistry.