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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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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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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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Masking and Demasking Agents01:19

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EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
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EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
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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...
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Reviving Multivalent-Metal Anodes in Simple Salt Electrolytes via Component Modifier Design.

Hang Zhou1, Wenhao Sun1, Xiaozheng Su1

  • 1College of Materials Science and Engineering, Qingdao University of Science and Technology, No. 53 Zhengzhou Road, Qingdao, 266042, Shandong, China.

Angewandte Chemie (International Ed. in English)
|September 5, 2024
PubMed
Summary

Researchers developed novel bromophenyl complex modifiers to improve magnesium (Mg) metal anode compatibility in rechargeable Mg batteries. This breakthrough enables a stable 250-day cycle life, enhancing battery performance and commercial viability.

Keywords:
DissociationElectrolyteHalogenated aromatic compoundsMagnesium batteriesMg(TFSI)2

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Battery Technology

Background:

  • Rechargeable magnesium (Mg)-metal batteries offer high energy density but face challenges with anode compatibility.
  • Developing stable Mg-metal anodes is crucial for commercializing Mg-based energy storage solutions.
  • Current electrolyte strategies often struggle to provide long-term stability and efficient Mg deposition/stripping.

Purpose of the Study:

  • To design and investigate novel molecular structure concepts for component modifiers in Mg battery electrolytes.
  • To enhance the reactivity and compatibility of Mg-metal anodes at a molecular level.
  • To achieve superior electrochemical performance and cycle life in rechargeable Mg batteries.

Main Methods:

  • Molecular structure design of bromophenyl complex-based component modifiers.
  • Synthesis and application of 1-(3-bromophenyl)-N,N-dimethylmethanamine (BPDMA) as an optimal modifier.
  • Electrochemical characterization using Mg//Cu asymmetric cells and analysis of Mg electro-plating/stripping properties.
  • Spectroscopic and electrochemical analyses to understand interfacial mechanisms.

Main Results:

  • Exceptional Mg electro-plating/stripping properties were achieved with a stable cycle life of 250 days.
  • The optimal modifier, BPDMA, facilitated the formation of unique electrochemically-active Br-containing ion-pairs.
  • A significantly thinner Br-containing and organic-inorganic mixed interphase layer was observed on Mg-metal anodes.
  • The strategy proved effective in reviving conventional MgSO4-based and Ca-ion electrolytes.

Conclusions:

  • Molecular structure design of component modifiers is a powerful strategy for enhancing Mg-metal anode compatibility.
  • Bromophenyl complex-based modifiers, like BPDMA, enable stable and efficient cycling in rechargeable Mg batteries.
  • The developed approach demonstrates broad applicability and superiority for improving various electrolyte systems.