Synthesis and optical properties of phenylene vinylene derivatives with cyano groups

Helical H-type aggregation of trimeric p-phenylene vinylene with chiral ester groups

“…When water content increases to 80%, the maximal emission peaks red-shift from 391 nm and 414 nm to 448 nm and 478 nm, respectively, and PL intensity approximately decreases 5 times. These results suggest further the formation of H -type aggregation of ChTPV in 80% H 2 O/THF mixed solvents (Kim et al 2007). Interestingly, the relative emission intensity of the second vibronic band (0-1) is markedly decreased.…”

Pyrazolyl-substituted polyconjugated molecules for optoelectronic applications

“…However, emission enhancement (in the case of P2) followed by transition from the liquid to solid phase is untypical and need to be clarified. In a solid state cyano-substituted P2 molecule torsions and so the torsion induced nonradiative deactivation processes are suppressed due to the rigid environment [19,20]. Moreover, steric and electrostatic effects induced by the introduction of bulky and polar substituents prevent tight packing of the molecules in the solids, what significantly reduces excitation migration, and thus, lowers exciton migration-related quenching.…”

“…The combined organic layers were washed with brine, dried over sodium sulfate, filtrated, the solvent was evaporated. The product was purified by column chromatography (eluent: ethyl acetate:n-hexane ¼ 1: 20 …”

Multicomponent Organic Nanoparticles for Fluorescence Studies in Biological Systems

“…This finding was likely due to separation of fluorophores within the excimer assemblies present within the nanoparticles and a subsequent loss of selfquenching. [33] The dramatic reduction in FRET and FRET ratio during dual-component nanoparticle dissolution provides a useful measure allowing monitoring of the physical state of the nanosuspensions.…”