The Role of Fiber Agglomeration in Formation of Perylene-Based Fiber Networks

Gel scaffolds and emerging applications in biomedicine

“…14a ). 49 Moreover, the amino acid–PBIs (33) can form one-dimensional structures at high pH and then gels at low pH. Both the dried solutions and dried gels are photoconductive.…”

Stereochemistry and Twisted Crystals

“…[95] Assembly of small molecules can also display this kind of reversal in aggregate morphological chirality as a function of the hierarchy of assembly. [96] This effect can be seen using the chiroptical signal that indicates unwinding of individual fibrils, [97] and union of helical fibrils to give superhelices. [98] Helical aggregates of amide-containing phospholipids were shown to form helical fibers which in turn aggregate to superhelices with opposite chirality, and relief of stress was inferred to explain this effect.…”

Pentacene–Bridge Interactions in an Axially Chiral Binaphthyl Pentacene Dimer

“…In covalently bridged dimers where the bridge is chiral, its chiroptical response, i.e., a result of its dissymmetric interaction with circularly polarized light, can be implemented to probe intramolecular interactions. − For instance, circular dichroism (CD), which measures the difference in the absorption of left (L) and right (R) handed circularly polarized light, has been often used to determine the absolute ground-state configuration of dimers. − The CD signal of chiral dimers is remarkably sensitive to coupling between monomers and is of a much longer range (∼1/ R 12 2 ) than the dipolar intermolecular interaction, which scales 1/ R 12 3 , where R 12 is the vector separation between the monomers (or molecules). , As such, the CD signatures of chiral covalently bridged dimers have previously been utilized to investigate excitonic coupling between monomer transitions, perturbations of the monomer transitions due to the chiral bridge, , coupling of electronic and magnetic transition dipole moments in the dimer, , and wave function overlap between the monomer and the chiral bridge units. While CD is responsive to molecular arrangements in dimers at the ground state, excited-state CD is highly sensitive to coupling between monomers and monomer–bridge interactions in the excited state.…”