A potential J aggregate molecular system: crystal packing and optical properties of 4,4′-bis(2,3,4,5,6-pentafluorostyryl)stilbene

Attogram Sensing of Trinitrotoluene with a Self-Assembled Molecular Gelator

“…To get insight on the mode of interaction and molecular packing, X-ray diffraction (XRD) analysis of OPVPF gel before and after exposure to TNT was performed (Figure ). The XRD pattern before exposure to TNT (Figure a) indicates a brickwall-type arrangement of the molecules, which is in analogy to the previous reports. , For example, the crystal XRD data of a bis(pentafluorostyryl)stilbene derivative showed a brickwall-type assembly in which each brick is situated over the gap between the bricks in the row below . In a similar situation, each of the terminal fluorinated aromatic rings of OPVPF is sandwiched between the central aromatic rings of the neighboring OPVPF molecules, and vice versa.…”

“…Later we focused our attention on a perfluoroarene-based gelator, OPVPF , which forms stable gels in nonpolar solvents at room temperature (critical gelation concentration value in n -hexane is 0.75 mM, 1.58 mg/mL), with a good solid-state emission quantum yield of 63% . There are several reports on organogels based on arene–perfluoroarene interactions, several formed through a brickwall type of molecular packing. − We hypothesized that such a brickwall-type molecular packing and the possible charge localization in OPVPF (as evident from the electron density distribution calculation using TITAN software, Figure S1) may facilitate strong interaction between electron-deficient aromatic molecules such as TNT. Surprisingly, OPVPF gel showed significant quenching of fluorescence in the presence of different nitroaromatic compounds, which led us to a detailed investigation on the potential of the gelator for TNT detection.…”

Reversible photoswitching of stimuli-responsive Si(100) surfaces engineered with an assembled 1-cyano-1-phenyl-2-[4′-(10-undecenyloxy)phenyl]-ethylene monolayer

“…Stilbene films have also been extensively studied in order to exploit their solid-state isomerization dynamics. 12 These thin films are generally obtained by sublimation, 13 spin coating, 14 or by the Langmuir-Blodgett 15 (LB) technique. With these techniques, the organization of the molecules within the film is difficult to control.…”

Nanofluids: A New Class of Materials Produced from Nanoparticle Assemblies

“…The absorption spectrum for the nanofluid with a small amount of added water (0.5 mL) is also shown; the addition of water to the nanofluid modified its absorption characteristics, and they are identical to those of the Duasyn Acid Blue powder dissolved in water. The presence of a blue-shifted trailing band edge may be attributed to the presence of dye aggregates, [8] which would imply that the dye species present in the nanofluid were molecular clusters that are electrostatically coupled to the surfactant molecules within surfactant cages. The addition of water apparently broke the clusters by creating a solution of dye molecules in water.…”

“…Although solution thermodynamics dictate the presence primarily of dye molecules in the bulk of the dye solution (e.g., in water), it also requires the presence of (dynamic) clustering of dye molecules at the air±solution interface, which is due to surface tension. The extent of clustering, however, depends on the dissolved chemical component, [8] in this case, Duasyn Acid Blue. If our hypothesis is correct, the PL at the interface should be blue-shifted with respect to the bulk solution.…”