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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...
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...
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
Formation of Complex Ions03:45

Formation of Complex Ions

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...
Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...

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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

Supramolecular electron transfer by anion binding.

Shunichi Fukuzumi1, Kei Ohkubo, Francis D'Souza

  • 1Department of Material and Life Science, Graduate School of Engineering, Osaka University, ALCA, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan. fukuzumi@chem.eng.osaka-u.ac.jp

Chemical Communications (Cambridge, England)
|July 7, 2012
PubMed
Summary
This summary is machine-generated.

Anion binding enables the creation of supramolecular electron donor-acceptor complexes. This strategy facilitates rapid electron transfer, mimicking natural photosynthesis and leading to stable, long-lived charge-separated states.

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Area of Science:

  • Supramolecular Chemistry
  • Photochemistry
  • Electron Transfer

Background:

  • Anion binding is a key strategy for constructing supramolecular electron donor-acceptor complexes.
  • Sophisticated designs now mimic photoinduced electron transfer in photosynthetic reaction centers.
  • Kinetic studies reveal electron transfer events are faster than anion binding/dissociation.

Purpose of the Study:

  • To investigate the role of anion binding in modulating electron transfer dynamics within supramolecular complexes.
  • To explore how anion binding influences the stability and charge separation of donor-acceptor systems.
  • To highlight examples of anion-mediated electron transfer ensembles.

Main Methods:

  • Construction of supramolecular complexes utilizing anion binding.
  • Kinetic studies of photoinduced electron transfer and back electron transfer.
  • Spectroscopic analysis of electron donor-acceptor interactions and charge-separated states.

Main Results:

  • Anion binding ensures donor-acceptor linkage stability during rapid electron transfer.
  • Tetrathiafulvalene calix[4]pyrroles (TTF-C4Ps) act as donors, facilitating electron transfer to acceptors.
  • Anion binding to oxoporphyrinogen units accelerates forward electron transfer and decelerates back transfer.
  • Anion binding stabilizes complexes, leading to long-lived charge-separated states with porphyrin-fullerene systems.

Conclusions:

  • Anion binding is a powerful tool for controlling electron transfer rates and stability in supramolecular systems.
  • The kinetic difference between electron transfer and anion binding/dissociation is crucial for maintaining complex integrity.
  • Anion-mediated supramolecular complexes offer promising avenues for artificial photosynthesis and charge-separated state generation.