Through-Solvent Tunneling in Donor-Bridge-Acceptor Molecules Containing a Molecular Cleft

Area of Science:

• Physical Chemistry
• Supramolecular Chemistry
• Photochemistry

Background:

• Electron transfer is fundamental in chemistry and biology.
• Understanding electron tunneling in polar solvents is crucial for various chemical processes.
• Molecular scaffolds can precisely control distances and orientations between interacting groups.

Purpose of the Study:

• To investigate solvent-mediated electron tunneling between donor and acceptor groups.
• To explore how molecular cleft size and solvent interactions influence electronic coupling.
• To demonstrate the significance of electron tunneling through nonbonded contacts.

Main Methods:

• Utilizing photoinduced electron transfer (PET) as a primary technique.
• Employing bis-peptide scaffolds to create controlled molecular clefts.
• Studying PET across two distinct cleft sizes in polar solvents.

Main Results:

• Electronic coupling is significantly influenced by solvent properties.
• The molecular cleft's ability to accommodate and interact with the solvent modulates electron tunneling.
• Nonbonded contacts play a critical role in facilitating electron tunneling pathways.

Conclusions:

• Solvent-mediated electron tunneling is controllable via molecular design.
• Molecular clefts provide a platform for studying tunneling in polar environments.
• This strategy offers insights into electron transfer mechanisms in solution.