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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

2.0K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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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...
1.7K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.4K
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...
28.4K
Formation of Complex Ions03:45

Formation of Complex Ions

18.8K
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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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Metal-Molecule Interactions Govern CO2 Reduction with Potential-Dependent Charge Transfer Effects.

Ruyue Yin1, Chunjin Ren2, Yuxiao Meng1

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The Journal of Physical Chemistry Letters
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Metallic substrates significantly influence molecular catalyst performance for carbon dioxide (CO2) reduction by dynamically tuning electronic structure under applied potential. This reveals key design principles for efficient electrocatalysts.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Molecular catalysts offer precise active sites but their performance is substrate-dependent.
  • Understanding substrate effects on catalytic activity, especially under electrochemical conditions, is crucial.
  • Applied potential dynamically alters interfacial electronic structure, impacting catalyst behavior.

Purpose of the Study:

  • To investigate how metal substrates regulate CO2 reduction activity of transition-metal phthalocyanines (TMPcs).
  • To elucidate the mechanisms by which substrates and applied potential influence catalytic performance.
  • To provide design principles for supported molecular catalysts.

Main Methods:

  • Density functional theory (DFT) calculations.
  • Constant-potential simulations.
  • Systematic investigation of TMPcs (FePc, CoPc, NiPc) on various metal substrates (Au, Ag, Pt).

Main Results:

  • Metal substrates regulate activity via static charge state tuning and potential-driven dynamic charge transfer.
  • Electron transfer at the metal center effectively describes *CO adsorption and activity trends.
  • Metallic substrates act as charge reservoirs, dynamically modulating active sites under applied potential.
  • CoPc/Pt(111) shows favorable CO2 reduction at -0.6 V vs RHE, unlike graphene-supported CoPc.

Conclusions:

  • Both substrate type and applied potential are critical for molecular electrocatalyst activity.
  • Dynamic charge transfer from metallic substrates significantly enhances CO2 reduction.
  • Design principles for supported molecular catalysts can be derived from understanding these substrate-catalyst interactions.