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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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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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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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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Formation of Complex Ions03:45

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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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 the dxy,...
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Complexation Equilibria: The Chelate Effect01:19

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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...
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Deciphering Electrocatalytic Activity in Cu Nanoclusters: Interplay Between Structural Confinement and Ligands

Sourav Biswas1, Yamato Shingyouchi2, Maho Kamiyama2

  • 1Research Institute for Science & Technology, Tokyo University of Science, Tokyo, 162-8601, Japan.

Small (Weinheim an Der Bergstrasse, Germany)
|March 7, 2025
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Summary

Ligand-protected copper nanoclusters (Cu NCs) show tunable electrocatalytic CO2 reduction. Controlling Cu NC structure and ligands precisely directs selectivity towards desired products like HCOOH.

Keywords:
CO2 reductionatomically‐precisecoppercopper nanoclustersnanoclusters

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Area of Science:

  • Nanomaterials Science
  • Catalysis
  • Electrochemistry

Background:

  • Ligand-protected copper nanoclusters (Cu NCs) offer precise atomic structures and tunable catalytic properties.
  • Challenges in Cu NCs include stability issues and limited structural diversity, hindering deeper research.

Purpose of the Study:

  • To synthesize and characterize distinct Cu NCs by modifying reaction conditions and ligands.
  • To evaluate the electrocatalytic CO2 reduction performance of synthesized Cu NCs.
  • To investigate the structure-activity relationships governing Cu NC catalytic behavior.

Main Methods:

  • One-pot synthesis strategy for three distinct Cu NCs.
  • Modification of reaction conditions and ligands (p-toluenethiol, m-aminobenzethiol).
  • Electrocatalytic CO2 reduction assessment and theoretical analysis.

Main Results:

  • The same p-toluenethiol ligand yielded two different Cu NC geometries.
  • Cu NCs exhibited diverse catalytic activities and product selectivity in CO2 reduction.
  • Cu11 NC with p-toluenethiol selectively produced HCOOH (FE ~45%), while m-aminobenzethiol shifted selectivity to H2 (FE ~82%).
  • Altering Cu18 NC geometry with p-toluenethiol decreased HCOOH selectivity (FE ~35%).

Conclusions:

  • Precise control over Cu NC core structure and surface ligand environment dictates catalytic behavior.
  • Cu NCs are highly tunable for specific catalytic applications through structural and chemical modifications.
  • Findings emphasize the potential of rationally designed Cu NCs for efficient CO2 electroreduction.