Anion Transport with Chalcogen Bonds.

Area of Science:

• Supramolecular Chemistry
• Organic Chemistry
• Chemical Biology

Background:

• Anion transporters are crucial for biological processes and synthetic chemistry.
• Current transporters often rely on hydrogen bonding or lone pair interactions.
• Developing novel anion recognition motifs is essential for advancing the field.

Purpose of the Study:

• To introduce novel synthetic anion transporters based on chalcogen bonds.
• To investigate the efficacy of dithieno[3,2-b;2',3'-d]thiophenes (DTTs) as anionophores.
• To correlate the electronic properties of DTTs with their anion binding and transport capabilities.

Main Methods:

• Synthesis of electron-deficient dithieno[3,2-b;2',3'-d]thiophene derivatives.
• Anion binding studies in solution using spectroscopic techniques.
• Anion transport assays across artificial lipid bilayers.

Main Results:

• Dithieno[3,2-b;2',3'-d]thiophenes effectively bind anions via chalcogen bonds at sulfur atoms.
• Anion binding affinity and transport efficiency correlate with the depth of the sulfur σ-holes.
• Demonstrated successful anion transport across lipid bilayers using DTT-based transporters.

Conclusions:

• Dithieno[3,2-b;2',3'-d]thiophenes represent a privileged scaffold for engineering chalcogen bond-based anion transporters.
• This work expands the toolkit of anion recognition strategies beyond traditional hydrogen bonding and lone pair interactions.
• The findings pave the way for new functional systems utilizing chalcogen bonds for anion manipulation.