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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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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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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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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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Crystal Field Theory - Octahedral Complexes02:58

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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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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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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...
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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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Solvation-driven charge transfer and localization in metal complexes.

Ariana Rondi1, Yuseff Rodriguez1, Thomas Feurer1

  • 1Institute of Applied Physics, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland.

Accounts of Chemical Research
|April 23, 2015
PubMed
Summary
This summary is machine-generated.

Solvent molecules dynamically influence charge transfer (CT) states, going beyond a passive role. New quantum mechanics methods are needed to accurately model these solvent-solute interactions in photochemical processes.

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Area of Science:

  • Physical Chemistry
  • Photochemistry
  • Computational Chemistry

Background:

  • Solvent dynamics critically impact reaction rates and products in physicochemical processes.
  • In polar solvents, solvent response typically stabilizes charge separation states during charge transfer (CT) processes.
  • Understanding solvation mechanisms is key for describing photochemical processes and designing molecular devices.

Purpose of the Study:

  • To investigate the role of solvent molecules in the formation and stabilization of photoexcited charge transfer (CT) states.
  • To challenge the prevailing assumption of perturbative solvent effects in polar solvation models.
  • To highlight the need for advanced computational methods that account for nonperturbative solvent-solute interactions.

Main Methods:

  • Ultrafast time-resolved spectroscopies were employed to study CT states.
  • Computational studies were performed on molecular complexes with photoexcited CT states.
  • Analysis focused on the dynamical response of polar solvents to solute electronic changes.

Main Results:

  • Current models inaccurately describe CT state formation and stabilization in certain molecules, like transition metal complexes.
  • Solvent molecules actively modulate intramolecular electron density redistribution, rather than being passive spectators.
  • Direct solvent-solute interactions and local electrostatics significantly influence solute excited states.

Conclusions:

  • The established picture of polar solvation as a perturbative electrostatic interaction is insufficient.
  • Advanced quantum mechanics methods are required to include nonperturbative solvent effects and direct interactions.
  • Accurate modeling of solvent dynamics is essential for understanding and predicting photochemical behavior.