Di- and Tetracyano-Substituted Pyrene-Fused Pyrazaacenes: Aggregation in the Solid State

Area of Science:

• Organic electronics
• Materials science
• Supramolecular chemistry

Background:

• Pyrene-fused pyrazaacenes are a class of organic molecules with potential applications in electronics.
• Electron acceptors are crucial components in organic electronic devices, facilitating charge separation and transport.
• Understanding solid-state packing is essential for optimizing charge transport properties in organic semiconductors.

Purpose of the Study:

• To synthesize novel di- and tetracyano-substituted pyrene-fused pyrazaacenes.
• To investigate the potential of these compounds as electron acceptors in the solid state.
• To elucidate the relationship between molecular structure, crystal packing, and charge transport properties.

Main Methods:

• Chemical synthesis of five di- and tetracyano-substituted pyrene-fused pyrazaacenes.
• Single crystal growth and X-ray diffraction analysis.
• Density Functional Theory (DFT) calculations to determine transfer integrals and reorganization energies.

Main Results:

• Successful synthesis of five target compounds.
• Analysis of crystal structures revealed specific packing arrangements.
• DFT calculations provided insights into charge carrier mobility and energy landscapes.

Conclusions:

• The synthesized pyrene-fused pyrazaacenes exhibit promising characteristics for solid-state electron acceptor applications.
• Crystal packing significantly influences the potential for efficient charge transport.
• These findings contribute to the rational design of novel organic semiconductors.