Synthesis, structure, and properties of twisted π-conjugated molecules featuring three-dimensional π-π interactions...

Area of Science:

• Organic Chemistry
• Materials Science
• Solid-State Physics

Background:

• Development of novel π-conjugated molecules is crucial for advanced electronic applications.
• Thiophene derivatives are widely studied for their optoelectronic properties.
• Molecular design to control solid-state packing and charge transport is an ongoing challenge.

Purpose of the Study:

• To synthesize novel thiophene-containing twisted π-conjugated molecules.
• To investigate the impact of steric hindrance on molecular structure and packing.
• To evaluate the hole-transporting capabilities of the synthesized materials.

Main Methods:

• Synthesis of thiophene-based molecules with methyl groups at sterically hindered positions.
• Solid-state characterization to observe π-π stacking.
• Fabrication and testing of field-effect transistor devices to measure charge mobility.

Main Results:

• Successfully synthesized twisted π-conjugated thiophene molecules.
• Observed significant three-dimensional π-π stacking in the solid state.
• Achieved hole-transporting mobility up to 1.85 × 10^-4 cm² V^-1 s^-1.

Conclusions:

• Sterically hindered methyl groups effectively induce molecular twisting and 3D π-π stacking.
• The synthesized molecules demonstrate promising hole-transporting characteristics.
• These findings contribute to the design of efficient organic semiconductors for electronic devices.