Ultrafast dynamics of Auramine O in composite films

Abstract

Ultrafast excited-state dynamics of Auramine O, a diphenylmethane dye, in polymethylmethacrylate (PMMA) and in hybrid organic/inorganic sol–gel based films have been studied by means of femtosecond fluorescence upconversion experiments. The fluorescence transients of the samples showed a fast decay (few picoseconds) and a long decay (hundreds of picoseconds) representing a rapid cooling of the excess excitation energy to the matrices and the excited-state lifetime of the dye molecules, respectively. Different dynamic Stokes shifts in PMMA and hybrid glasses have been observed, which is argued to be ascribed to the different couplings between the emissive and nonemissive excited states for the two types of matrices

Photophysics of Auramine O adsorbed on solid clays

“…Several studies describe the fluorescence behavior of Auramine in liquid media [1][2][3][4], but few studies focus on the fluorescence of Auramine adsorbed on solid matrices [13][14][15][16].…”

Substrate switchable Suzuki–Miyaura coupling for benzyl ester vs. benzyl halide

“…Diarylmethanes are an important class of compounds because they are widely used as a framework for functional materials including polymers, 1 dyes, 2 and biologically active compounds. 3 Various methods have been reported for their synthesis, including the Suzuki–Miyaura coupling reaction, which has become our focus.…”

Selective Synthesis of (Benzyl)biphenyls by Successive Suzuki–Miyaura Coupling of Phenylboronic Acids with 4-Bromobenzyl Acetate under Air Atmosphere

“…The diphenylmethane framework is often found in polymers, 1 dyes, 2 and bioactive compounds. 3 Although simple diphenylmethane derivatives are easily prepared by acid-catalyzed benzylation, 4 this protocol cannot afford substituted diphenylmethanes because of several limitations of Friedel–Crafts alkylation.…”