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Formation of Complex Ions03:45

Formation of Complex Ions

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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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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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Isomerism in Complexes
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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Selective amide bond formation in redox-active coacervate protocells.

Jiahua Wang1,2, Manzar Abbas1, Junyou Wang3

  • 1Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands.

Nature Communications
|December 21, 2023
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Summary

Researchers created redox-active coacervate protocells using ferricyanide and peptides. These protocells can synthesize peptides from amino acids, mimicking early life chemistry and controlling network formation.

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Area of Science:

  • Origin of life studies
  • Protocell research
  • Biochemistry

Background:

  • Coacervate droplets are studied as protocell models due to molecular sequestration and catalytic potential.
  • The synthesis of essential biomolecules like peptides within protocells from simple precursors is not well understood.

Purpose of the Study:

  • To develop a redox-active protocell model for synthesizing life's building blocks.
  • To investigate the role of redox chemistry in driving prebiotic reactions within coacervates.
  • To explore the spatial control of molecular assembly in primitive cell-like compartments.

Main Methods:

  • Formation of coacervate droplets via phase separation of ferricyanide and cationic peptides.
  • Utilizing the oxidizing potential of ferricyanide within coacervates to drive amide bond formation.
  • Investigating aminoacylation reactions with prebiotically relevant amino acids and α-amidothioacids.
  • Controlling the assembly of fibrous networks using ferricyanide-containing coacervates.

Main Results:

  • Redox-active coacervates were successfully formed and regulated by redox chemistry.
  • Ferricyanide within coacervates acted as an oxidizing hub for sequestered metabolites.
  • Amide bond formation between amino acids and α-amidothioacids was driven by the coacervates' oxidizing potential.
  • Aminoacylation was enhanced and selective for specific amino acids.
  • Spatial control over fibrous network assembly within and on coacervate protocells was achieved.

Conclusions:

  • The developed ferricyanide/peptide coacervates serve as a viable protocell model capable of synthesizing peptides.
  • This work demonstrates the integration of redox chemistry within primitive cell-like compartments for prebiotic synthesis.
  • The findings represent a significant advancement in understanding how life's building blocks could form in early Earth conditions.