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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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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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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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In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used to help predict the most appropriate Lewis structure when more than one reasonable structure exists.
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Crystal Field Theory
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CFT focuses on...
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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
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Efficient charge separation in Li(+) @C60 supramolecular complexes with electron donors.

Yuki Kawashima1, Kei Ohkubo, Shunichi Fukuzumi

  • 1Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871 (Japan), Fax: (+81) 6-6879-7370.

Chemistry, an Asian Journal
|November 14, 2014
PubMed
Summary

Lithium-ion-encapsulated fullerene (Li(+) @C60) shows improved reactivity in photoinduced electron transfer due to a more positive reduction potential. This enables the formation of stable charge-separated states in supramolecular complexes for enhanced solar cell performance.

Keywords:
electron transferfullereneslithiumphotochemistrysupramolecular chemistry

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Area of Science:

  • Supramolecular Chemistry
  • Photochemistry
  • Materials Science

Background:

  • Pristine C60 has limited reactivity in photoinduced electron-transfer reduction.
  • Understanding fullerene derivatives is crucial for developing advanced materials.

Purpose of the Study:

  • To investigate the enhanced reactivity of lithium-ion-encapsulated fullerene (Li(+) @C60) in photoinduced electron-transfer reactions.
  • To explore the formation of supramolecular complexes and their properties.
  • To evaluate the performance of Li(+) @C60 in photoelectrochemical solar cells.

Main Methods:

  • Electrochemical measurements to determine reduction potentials.
  • Spectroscopic analysis to study charge-separated states.
  • Fabrication and testing of photoelectrochemical solar cells.

Main Results:

  • Li(+) @C60 exhibits a more positive one-electron reduction potential (+0.14 V vs SCE) compared to C60 (-0.43 V vs SCE).
  • Li(+) @C60 forms strong supramolecular complexes with various anionic and π electron donors.
  • Photoinduced electron transfer leads to long-lived charge-separated states.
  • A solar cell using Li(+) @C60 supramolecular nanoclusters showed enhanced performance.

Conclusions:

  • Encapsulating Li(+) within C60 significantly enhances its photoinduced electron-transfer reactivity.
  • Li(+) @C60 facilitates the formation of stable supramolecular complexes with tunable electronic properties.
  • These findings highlight the potential of Li(+) @C60 in advanced optoelectronic devices, particularly solar cells.