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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Coordination-Induced Bond Weakening.

Nicholas G Boekell1, Robert A Flowers1

  • 1Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, United States.

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|July 28, 2022
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Summary
This summary is machine-generated.

Coordination-induced bond weakening enables efficient proton-coupled electron transfer reductions and mild dehydrogenation of feedstock molecules. This strategy forms weak bonds, facilitating synthesis, nitrogen fixation, and renewable energy applications.

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Area of Science:

  • Inorganic Chemistry
  • Catalysis
  • Materials Science

Background:

  • Coordination-induced bond weakening involves ligand X-H bond homolysis coupled with metal complex oxidation.
  • This process facilitates thermodynamically favorable proton-coupled electron transfer reductions.
  • It enables the formation of weak bonds via formal hydrogen atom transfer.

Purpose of the Study:

  • To review advances in coordination-induced bond weakening.
  • To provide mechanistic insights into the phenomenon.
  • To discuss future research opportunities and applications.

Main Methods:

  • Literature review of coordination-induced bond weakening systems.
  • Discussion organized by low-valent metal identity.
  • Analysis of mechanistic underpinnings.

Main Results:

  • Demonstrated facilitation of feedstock molecule dehydrogenation (water, ammonia, alcohols) under mild conditions.
  • Enabled formation of exceptionally weak substrate X-H bonds for synthesis and nitrogen fixation.
  • Identified relevance in biophotosynthesis and renewable chemical fuel storage.

Conclusions:

  • Coordination-induced bond weakening is a versatile strategy with broad applications.
  • Understanding the mechanism is key to developing new systems.
  • Further research holds promise for catalysis and energy storage.