Enhancement of emission by surfactant-induced aggregation in poly(phenylenevinylene)-based lipochromophores

Selective recognition of A/T-rich DNA 3-way junctions with a three-fold symmetric tripeptide

“…It is known that the excited state of these compounds is deactivated in solution by photoisomerization processes and intramolecular motions, 44 but their conformational restriction deactivates these nonradiative decay mechanisms leading to an increased emission quantum yield. 45,46 Thus, a 1 μM solution of 1 was titrated with increasing concentrations of different DNAs, and the emission at 400 nm upon excitation at 320 nm was recorded after each addition. We selected two different 3WJs: TA-3WJ , containing a three high-affinity sites for the AT-Hook peptides (TTTAA), and a GC-rich 3WJ as control, GC-3WJ .…”

Review on recent trends and prospects in π‐conjugated luminescent aggregates for biomedical applications

“…[67,68] These classes of molecules are found to be employed in wide applications in biology and fabrication of various electronic devices, including solar cells, transistors, and light-emitting diodes (LEDs), respectively. [69] Because of the diversified structure and tunable electronic properties of the oligomer, it could be a promising pathway to develop a smart AIEgenic oligomer to investigate its structure-property relationships and to explore several simple design strategies to fine-tune its molecular properties. Oligomers comprising of identical structures and molecular weights are considered to be more proficient models for studying the structure-property relationships.…”

Aggregation-Induced Emission Properties in Fully π-Conjugated Polymers, Dendrimers, and Oligomers

“…Likewise, other molecules have been used as a core for the preparation of oligomers with AIE properties, such as pyrene , BODIPY ( Figure 2 ) or, simply, benzene. Different derivatives of 1,3,5-tris(styrylbenzene) and 1,2,4,5-tetra(styryl)benzene with phenyl rings in different positions have been described for the design of propeller-shaped or butterfly-shaped molecules such as compounds 12 [ 15 , 56 , 57 , 58 ], 13 [ 59 ], 14 [ 60 ], 15 [ 61 ], 16 [ 15 , 57 ] and 17 [ 59 ] ( Figure 9 ). These compounds were prepared by a condensation reaction of the corresponding aldehydes or ketones, except 15, which was synthesized by cyclotrimerization of the TPE -acetylene in the presence of TaCl 5 -Ph 4 Sn as catalyst.…”

“…Exhaustive DFT studies indicate that, although the enhanced fluorescence effect can be mainly attributed to a RIM mechanism, the cis-trans photoisomerization, excitonic coupling, or RACI processes must also be considered in such a way that the emission of these compounds in solid state will be determined by the greater or lesser contribution of each of these phenomena. On the other hand, it is possible to induce the aggregation of these systems, not only through solvent mixtures but also through the use of surfactants [ 58 ]. Thus, 1,3,5-tris(styryl)benzene compounds similar to compound 12 have been encapsulated in cetyl trimethyl ammonium bromide (CTAB) micelles giving rise to worm-shaped aggregates of a few hundred nanometers in size ( Figure 10 ).…”

“…Photographs of TEM where the worm-shaped micelles are observed and the separations between the lattices formed. Reproduced with permission from [ 58 ]. Copyright Elsevier Ltd.…”