Binary charge-transfer complexes using pyromellitic acid dianhydride featuring C-H⋯O hydrogen bonds.

Area of Science:

• Crystal Engineering
• Supramolecular Chemistry
• Materials Science

Background:

• Charge-transfer complexes are crucial in developing novel electronic materials.
• Pyromellitic acid dianhydride (pmda) is a versatile electron acceptor.
• Understanding molecular interactions in these complexes informs material design.

Purpose of the Study:

• To synthesize and characterize novel binary charge-transfer complexes.
• To investigate the structural features and intermolecular interactions.
• To explore the packing arrangements of donor and acceptor molecules.

Main Methods:

• Synthesis of four binary charge-transfer complexes.
• Single-crystal X-ray diffraction analysis.
• Structural characterization of molecular arrangements and hydrogen bonding.

Main Results:

• Four complexes formed: pmda-naphthalene, pmda-fluoranthene, pmda-9-methyl-anthracene, and pmda-ethyl anthracene-9-carboxylate.
• All complexes display alternating donor and acceptor stacks.
• Weak C-H⋯O hydrogen bonds facilitate intermolecular connections.
• Specific crystallographic details (Z') noted for complexes I, II, and IV.

Conclusions:

• The study successfully synthesized and structurally elucidated new pmda-based charge-transfer complexes.
• The observed stacking and hydrogen bonding patterns provide insights into supramolecular assembly.
• These findings contribute to the fundamental understanding of charge-transfer complex structures.