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Lewis Acids and Bases02:33

Lewis Acids and Bases

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In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
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This lesson delves into Lewis acids and bases in the context of the octet rule for electron-deficient compounds. Here, the concept is discussed, emphasizing the group 13 elements like boron or aluminium. Since group 13 elements possess three valence electrons, they form trivalent compounds with a sextet of electrons and a vacant orbital for the central atom. Consequently, these electron-deficient compounds accept electrons from other species to complete their octet in a chemical reaction. They...
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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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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.
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Ladder Diagrams: Redox Equilibria01:30

Ladder Diagrams: Redox Equilibria

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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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Redox Reactions01:24

Redox Reactions

58.0K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Updated: Dec 13, 2025

Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
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MnI complex redox potential tunability by remote lewis acid interaction.

Anandi Srinivasan1, Jesús Campos, Nicolas Giraud

  • 1Université de Paris, Laboratoire d'Electrochimie Moléculaire, CNRS, F-75006 Paris, France. orestes.rivada@u-paris.fr.

Dalton Transactions (Cambridge, England : 2003)
|July 30, 2020
PubMed
Summary

This study shows how alkali cations influence a manganese iodine complex's redox potential through remote interactions. The research also explores the complex's electrochemical response to carbon dioxide, with added alkali salts.

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Area of Science:

  • Inorganic Chemistry
  • Electrochemistry
  • Materials Science

Background:

  • Manganese-iodine (MnI) complexes are of interest for their unique electronic properties.
  • Tuning redox potentials is crucial for designing new functional materials.
  • Understanding alkali cation interactions is key to controlling complex behavior.

Purpose of the Study:

  • To provide direct experimental evidence for the correlation between remote interactions and redox potential tuning in a novel MnI-complex.
  • To investigate the electrochemical behavior of the MnI-complex in the presence of carbon dioxide.
  • To examine the influence of added alkali salts on the electrochemical responses.

Main Methods:

  • Synthesis of a novel MnI-complex (designated as 1).
  • Electrochemical studies using cyclic voltammetry.
  • Analysis of remote interactions between the MnI-complex and alkali cations.

Main Results:

  • Direct experimental evidence demonstrating the correlation between remote interactions and redox potential tuning was obtained.
  • The electrochemical behavior of complex 1 towards carbon dioxide was characterized.
  • The effects of different alkali salts on the electrochemical properties were elucidated.

Conclusions:

  • Remote interactions with alkali cations significantly tune the redox potential of the synthesized MnI-complex.
  • The electrochemical response of the complex to CO2 is modulated by the presence of alkali salts.