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Area of Science:

  • Systems Chemistry
  • Supramolecular Chemistry
  • Chemical Networks

Background:

  • Systems chemistry focuses on emergent properties in molecular networks.
  • Dynamic combinatorial libraries (DCLs) are key to exploring collective behavior.
  • Reversible chemistry under thermodynamic control enables DCL formation.

Purpose of the Study:

  • To create a novel two-layer dynamic system using reversible chemistry.
  • To investigate how environmental pH changes affect molecular network composition.
  • To demonstrate a system capable of recording transient environmental perturbations.

Main Methods:

  • Preparation of a DCL using dithioacetal/thiol/disulfide exchange reactions.
  • Exploiting differential reaction rates in acidic and basic media.
  • Analysis of steady-state library composition to infer past environmental conditions.

Main Results:

  • A two-layer dynamic system was successfully constructed.
  • The system exhibits distinct behaviors in acidic (thiol/dithioacetal exchange) and basic (thiol/disulfide exchange) media.
  • Transient changes in pH were recorded in the final library composition, indicating the system's memory function.

Conclusions:

  • The developed dynamic system responds to transient environmental stimuli by altering its molecular composition.
  • The final state of the library retains information about past pH fluctuations (duration, intensity, timing).
  • This work offers a new approach for creating molecular systems with environmental memory capabilities.