Synthesis and Crystal Structure of Dimorphic Dibenzo[cde,opq]rubicene

Area of Science:

• Organic Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Polycyclic aromatic hydrocarbons (PAHs) are crucial in materials science and organic electronics.
• Developing novel PAHs with unique structural and electronic properties is an ongoing challenge.
• Dibenzo[cde,opq]rubicene represents a unique S-shaped PAH scaffold.

Purpose of the Study:

• To synthesize the novel polycyclic aromatic hydrocarbon dibenzo[cde,opq]rubicene.
• To characterize its structural and crystallographic properties.
• To explore synthetic methodologies for complex PAH construction.

Main Methods:

• An eight-step synthetic sequence was employed.
• Key reactions included iron-mediated [2+2+1] cycloaddition.
• Flash vacuum pyrolysis was utilized for a critical transformation.

Main Results:

• Successful synthesis of dibenzo[cde,opq]rubicene was achieved.
• Two distinct crystal modifications were obtained.
• Characterization by X-ray diffractometry confirmed the S-shaped, planar structure.

Conclusions:

• The synthesis of dibenzo[cde,opq]rubicene demonstrates a viable route to complex PAHs.
• The study provides insights into the structural diversity of S-shaped PAHs.
• The characterized crystal forms offer a basis for further investigation into its properties.