Involvement of organic fluorine substitution in the crystalline packing structures of tricyclic Diels–Alder adducts derived from diarylfulvenes and N-arylimides

X-ray crystal structures of p-halogenated 6,6-diphenylfulvenes

“…Also, as previously demonstrated [9], 6,6-diarylfulvenes have proven suitable diene components in Diels-Alder reactions [10].…”

“…In the same way behaves the compound 2 since there is no close intermolecular distance in the crystal structure (closest distance between adjacent aryl rings 4.7 Å ) that would indicate a p-stacking interaction [26]. Instead, a weak bifurcated C-HÁÁÁF contact [9] (d = 2.56 Å , h = 157°, d = 2.48 Å , h = 141°) leads to a zigzag chain along the crystallographic b-axis. In addition, C-HÁÁÁp interactions [27] connect the zigzag chains to a molecular network and stabilize the crystal structure of the compound 2.…”

Use of Melem as a Nucleophilic Reagent to Form the Triphthalimide C6N7(phthal)3—New Targets and Prospects

“…The torsion angle between the two ring systems in 2·CH 3 NO 2 is 35.58 on average. A comparison with other known derivatives [18,19] with the same imide unit revealed remarkable differences. In fluorinated N-phenyl-substituted maleimides or phthalimides, the torsion angle of about 598 is a result of the balance between repulsive and attractive forces between the ortho-substituents (H,F) and the oxygen atoms and the conjugation of p electrons over the whole molecular system.…”

“…Even in the field of s-triazines, the reaction of melamine with phthalic acid derivatives is rarely reported. [17] Cyclic imides like phthalimides or maleimides are known for their polymorphism, [18] the unusual non-inclusion of solvents in tricyclic derivatives, [19] as self-healing polymers, [20] and as host-guest networks. [21] Herein we report the successful synthesis of the triimide 2 by the nucleophilic reaction of 1 with phthalic acid chloride.…”

Synthesis, characterization and comparative study of a series of fluorinated Schiff bases containing different orientation CHN spacers

“…Detailed understanding of the electronic structure of the molecules and the specific intermolecular interaction terms would enable us to engineer better molecular structures and control their physic-chemical properties for targeted applications [3][4][5]. The driving force for the molecular packing arrangements largely arises from non-covalent interaction between molecules, such as hydrogen bonding, pÁ Á Áp stacking interactions as well as van der Waals force.…”