A neutral zwitterionic molecular solid

Area of Science:

• Materials Science
• Organic Electronics
• Supramolecular Chemistry

Background:

• Redox-active organic materials offer tunable electronic properties.
• Integrating ionizable groups into π-conjugated systems presents challenges in controlling electronic states.
• Hydrogen bonding plays a crucial role in molecular self-assembly and material properties.

Purpose of the Study:

• To synthesize and characterize a novel 1:1 acid/zwitterion hybrid material based on ethylenedithiotetrathiafulvaleneamidoglycine.
• To investigate the electronic properties and structural features of this new material, particularly the interplay between redox states and ionizable residues.
• To explore the potential of this system for creating advanced electronic devices at the chemistry-biology interface.

Main Methods:

• Chemical synthesis of ethylenedithiotetrathiafulvaleneamidoglycine and its adduct.
• X-ray crystallography to determine the 2D hydrogen-bonded architecture.
• First-principles calculations to analyze electronic structure and stability.
• Electrical conductivity measurements.

Main Results:

• A new 1:1 acid/zwitterion hybrid material with a 2D architecture was successfully synthesized.
• First-principles calculations indicated a stable metallic state for the neutral hybrid.
• Weak hole localization, driven by hydrogen bonding, resulted in high conductivity (1 S cm⁻¹).

Conclusions:

• The study demonstrates a novel approach to designing conductive organic materials by controlling hole localization through hydrogen bonding.
• The findings highlight the importance of the interplay between redox-active cores and ionizable groups in functional materials.
• This work opens avenues for developing bio-inspired electronic systems and sensors.