Pyrenylpyrazole-based donor/acceptor fluorescent dyes: Synthesis and photophysical properties

Hierarchy of Intermolecular Interactions in Highly Luminescent Pyrenyl-Pyrazole-Aldehyde

“…None two of these moieties are exactly coplanar. However, the actual electronic excitation involves charge transfer from pyrene toward pyrazole and partly the −CHO moiety, i.e., between two seemingly least conjugated molecular fragments …”

“…PPPcA (Figure ) is a donor-π-acceptor (D-π-A) dye, fluorescent (in blue) both in solution and in the solid state . Despite PAH-based dyes being so often environmentally sensitive, the luminescent properties of this compound seem totally unsusceptible to the influence of the crystalline environment, or the solvent used, under standard conditions .…”

Highly Fluorescent Dyes Containing Conformationally Restrained Pyrazolylpyrene (Pyrazoolympicene) Chromophore

“…All reagents and solvents were purchased from Sigma-Aldrich and used without further purification. Compound 2 was prepared as described in [22]. Column chromatography was carried out on silica gel 60 (0.040-0.063 mm, 230-400 mesh, Fluka).…”

“…We previously reported the synthesis and fluorescent properties of pyrazolylpyrenes 1 and 2 (Figure 1) [21,22].…”

Structure-controlled intramolecular charge transfer in asymmetric pyrene-based luminogens: synthesis, characterization and optical properties

“…[10][11][12][13] Generally speaking, there is an efficient strategy to obtain full colour emission materials by employing the D-A unit since these types of structures are beneficial in narrowing the band gap between the highest occupied molecular orbitals (HOMOs) and lowest unoccupied molecular orbitals (LUMOs). [14][15][16][17][18] However, to date, fully comprehending the structure-property relationship remains a valuable and challenging topic in materials science.…”