Hence, P-FDA and P-DCE exhibit strong similarities, while P-DCM structurally varies, accompanying with a differing macroscopic color appearance. The difference may result from varying crosslinking mechanisms of the aromatic units, regarding the choice between DCE and DCM. In literature, controversial implications exist about the crosslinking pathway in the presence of AlCl3 and di-or trichlorinated solvents, ranging from Scholl coupling to Friedel-Crafts reactions. Referring to our reaction system, we suppose that P-DCM is formed via a combination of direct aryl coupling and crosslinking with methylene bridges, while the building blocks in P-DCE and P-FDA are interconnected primarily via Friedel-Crafts alkylations. .