Adaptation in constitutional dynamic libraries and networks, switching between orthogonal metalloselection and...

Area of Science:

• Supramolecular Chemistry
• Chemical Adaptability
• Dynamic Covalent Chemistry

Background:

• Constitutional dynamic libraries (CDLs) offer adaptable molecular systems.
• Hydrazones and acylhydrazones are versatile building blocks for CDLs.
• External stimuli can trigger reorganization within CDLs.

Purpose of the Study:

• To investigate the reorganization and adaptation of hydrazone and acylhydrazone CDLs.
• To explore responses to chemical effectors (metal cations) and physical stimuli (light).
• To demonstrate network switching in response to orthogonal external agents.

Main Methods:

• Utilizing constitutional dynamic libraries of hydrazones and acylhydrazones.
• Applying metalloselection with zinc cations.
• Inducing photoselection via light irradiation and photoisomerization.
• Analyzing component amplification and network dynamics.

Main Results:

• Metalloselection in hydrazones amplifies Zn((1)A(2)B)2 by selecting (1)A(2)B.
• Photoselection in acylhydrazones amplifies Z-(1)A(1)C via photoisomerization.
• Acylhydrazones exhibit dual adaptation with component exchange and selection under orthogonal stimuli.
• Network switching observed with up-regulation of agonists and down-regulation of antagonists.

Conclusions:

• Hydrazone and acylhydrazone CDLs demonstrate remarkable adaptability to external stimuli.
• Metalloselection and photoselection are effective mechanisms for driving CDL reorganization.
• Dual adaptation in acylhydrazones showcases complex network switching behavior.
• These findings open avenues for designing responsive and adaptive molecular systems.