Intramolecular hydrogen bonding assisted charge transport through single rectifying molecule

Area of Science:

• Molecular electronics
• Organic chemistry
• Materials science

Background:

• Molecular self-assembly is a key technique for fabricating nanoscale electronic devices.
• Organic molecules offer tunable electronic properties for device applications.
• Hydrogen bonding plays a crucial role in molecular conformation and function.

Purpose of the Study:

• To synthesize a novel diode molecule based on an α-hydroxyphenyl pyridine motif.
• To investigate the effect of intramolecular hydrogen bonding on molecular conductivity.
• To compare the electronic properties of molecules with and without intramolecular hydrogen bonding.

Main Methods:

• Synthesis of α-hydroxyphenyl pyridine derivatives.
• Molecular self-assembly onto a gold electrode surface.
• Measurement of current-voltage (I-V) characteristics.

Main Results:

• A novel diode molecule with an α-hydroxyphenyl pyridine motif was successfully synthesized.
• Molecular self-assembly on gold electrodes resulted in moderate rectifying behavior.
• Disrupting intramolecular hydrogen bonding (via methylation) led to a twisted conformation and reduced conductivity.
• The presence of intramolecular hydrogen bonding substantially improved molecular conductivity.

Conclusions:

• Intramolecular hydrogen bonding is critical for enhancing molecular conductivity in these diode molecules.
• The synthesized molecules demonstrate potential for use in molecular electronic devices.
• Structural modifications significantly impact the electronic performance of organic molecules.