Laser flash photolysis of supported gold nanopar-ticles exciting at the surface plasmon band (532 nm) has allowed in case Au/CeO2 and Au/OH-npD (OH-npD: Fenton-treated diamond nanoparticles) detection transients decaying microsecond time scale that have been attributed as indicating photoinduced electron ejection from based on N2O quenching observation generation methyl viologen radical cations. This photochemical behavior led us to hypothesize there could be assistance catalytic activity...

Abstract Herein, we describe the photochemical behavior of porous metal–organic framework MIL‐125(Ti)‐NH 2 , built up from cyclic Ti 8 O (OH) 4 oxoclusters and 2‐aminoterephthalate ligands. While does not emit upon excitation at 420 nm, laser flash photolyses dry samples (diffuse reflectance) or aqueous suspensions (transmission) solid have allowed detecting a transient characterized by continuous absorption 390 to 820 nm decaying in sub‐millisecond timescale, which is quenched oxygen. This...

Graphene sheets quench the singlet and triplet excited states of a series six photochemical probes including pyrene, acridine orange, tris(2,2́-bipyridyl)ruthenium(II) dichloride, methylene blue, meso-tetrakis(phenylsulphonate)porphyrin, 5,10,15,20-tetraphenyl-21H,28H-porphine zinc. It was found that Stern-Volmer fluorescence quenching can fit to one or two different regimes depending on probe. In addition, be either static dynamic fluorophore. The occurrence several has been interpreted...

A modified graphene oxide containing aza-9-crown-3 ether units covalently anchored has been prepared; aqueous suspensions of this material in the presence Li(+), Na(+) and K(+) cations exhibit enhanced electrochemical response, photoinduced charge separation longer lifetimes, facts that can be attributed to stabilization electrons on by nearby alkali metal cation-azacrown complexes.

Covalent functionalization of single- and multi-walled carbon nanotubes, both at the tips on walls, by perylenebisimides (PBIs) is reported resulting PBI-CNT hybrid materials have been characterized spectroscopic (UV-Vis, Raman, 1H-NMR), thermal (TGA) microscopy techniques (TEM). Photoexcitation resulted in one-electron reduction PBI moiety with simultaneous oxidation CNT, yielding (PBI)˙−-(CNT)˙+, as revealed transient absorption measurement.

Organosilica spheres functionalized with two different photoactive units, diphenylanthracene, DPA@SPH, and viologen, VIO@SPH, covalently linked to the silica framework are prepared. These new materials have a uniform diameter, 300 nm for DPA@SPH 550 exhibit typical photochemical response of organic moieties. It is observed that radical cations incorporated in structure remarkably persistent. Due their morphology regular diameter do not tend aggregate they form highly regular, ordered...

While stable polymer electrochromic properties are mainly realized from the electrochemical oxidation of p-type conjugated polymers, in this paper we report that can also be easily achieved by reduction n-type such as PF4Ox, an alternating copolymer quater(9,9-dioctylfluorene) and oxadiazole. The introduction strong electron-accepting oxadiazole unit into poly(9,9-dioctylfluorene) main chain promoted stability reduction. film displayed excellent elecrochromic property upon reduction, which...

The photophysical properties of a series 9,9′-dioctylfluorene copolymers containing 1,3,4-oxadiazole units (PF1Ox, PF2Ox, PF3Ox, and PF4Ox) as well copolymer 9,9-dioctylfluorene, 1,3,4-oxadiazole, N-octylcarbazole (PFOxCz) have been characterized by fluorescence time-resolved absorption spectroscopy. It was observed that the data PF4Ox were almost coincident (λem = 426 nm, ϕfl 0.38) somewhat different from those PF1Ox 404 0.34) PFOxCz 472 0.39). These differences are attributed to influence...

A set of fluorene copolymers designed to introduce electron donor/acceptor structures in the polymer chain that could eventually produce more efficient charge separation with long lifetimes has been prepared. To validate our approach, herein we report photoluminescence and laser flash photolysis measurements series alternating specially functionalized copolymers. The contain 9,9-dioctylfluorene N-octylcarbazole, oxadiazole, oxadiazole−octafluorobiphenyl−oxadiazole units. It appears copolymer...

Abstract The present manuscript reports a mesoporous organosilica (mpSiO 2 ) containing p ‐phenylene vinylene (PPV) co‐polymer partially grafted to the walls of hybrid material (PPV ${ \subset }$ mpSiO ). This was obtained by using bis‐silylated 2,5‐bis(chloromethylphenylene) as silicon precursor in combination with tetraethyl orthosilicate (TEOS) and cetyltrimethylammonium bromide (CTABr) surfactant. final polymer formed adding appropriate amounts...

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