Details

Autor(en) / Beteiligte

• Lacombe, Sylvie
• Soumillion, Jean-Philippe
• El Kadib, Abdelkrim
• Pigot, Thierry
• Blanc, Sylvie
• Brown, Ross
• Oliveros, Esther
• Cantau, Christophe
• Saint-Cricq, Philippe

Titel

Solvent-Free Production of Singlet Oxygen at the Gas−Solid Interface: Visible Light Activated Organic−Inorganic Hybrid Microreactors Including New Cyanoaromatic Photosensitizers

Ist Teil von

• Langmuir, 2009-09, Vol.25 (18), p.11168-11179

Ort / Verlag

Washington, DC: American Chemical Society

Erscheinungsjahr

2009

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We synthesized new cyanoaromatics, benzo[b]triphenylene-9,14-dicarbonitrile (DBTP) 1a and a graftable derivative, 9,14-dicyanobenzo[b]triphenylene-3-carboxylic acid (DBTP-COOH) 1b, easily prepared from commercial reagents. Their photosensitizing properties were investigated. Hybrid porous silica monoliths loaded with encapsulated 1a or grafted 1b were prepared, and their adsorption, spectroscopic and photosensitizing properties, as well as stability, were compared. Solvent-free, efficient oxidation of dimethylsulfide (DMS) was observed at the gas−solid interface under visible light irradiation. Quantum yields of formation of 1O2 inside the porous monoliths are comparable to those of phenalenone. Singlet oxygen lifetimes (∼25 μs) were found to be longer in silica monoliths than in usual polar solvents such as methanol or ethanol. This new class of hybrid materials work as porous, transparent, and highly efficient microreactors for oxidation reactions under visible light.