Surface photochemistry, aromatic

The presence of an aromatic ring in the molecule favours the oxidation in the allylic position. By constrast with the selectivity pattern of photochemistry (see Fig. 1), the formation of 1-tetralone would be due to the mode of adsorption of tetralin at the surface of titania and/or to the mode of attack of photoactivated oxygen. 

Models of irradiated disks predict four chemically distinct zones (see Fig. 4.1). (I) Zone of ices in the cold mid-plane opaque to incoming radiation. Chemistry in this region is dominated by cold gas-phase and grain-surface reactions. Here Infrared Space Observatory (ISO) and Spitzer observations confirmed the existence of ices, various silicates and PAHs (polycyclic aromatic hydrocarbons e.g. van den Ancker et al. 2000 van Dishoeck 2004 Bouwman et al. 2008). (II) Zone of molecules, a warm molecular layer adjacent to the mid-plane, dominated by ultraviolet/X-ray-driven photochemistry (III) the heavily irradiated zone of radicals, a hot dilute disk atmosphere deficient in molecules and (IV) the inner zone, inside of the ice line where terrestrial planets form. 

Shortly after Nitzan and Brus s theoretical prediction [13] of the possibility of surface enhanced photochemistry due to plasmon interactions, Goncher and Harris [20] presented experimental evidence for enhanced photofragmentation of several aromatic molecules (pyridine, pyrazine, and benzaldehyde) on roughened silver surfaces using low intensity UV radiation (364 run). See also the more detailed, subsequent paper of Goncher, Parsons and Harris [21],... 

Both photosensitized reacticms and heterogeneous photocatalysis have been the focus of many studies and reviews for the degradation of organic and inorganic species in natural terrestrial surface water. This review will discuss their potential importance in the atmosphere for two distinct cases — photochemistry of mineral dust (which contains oxides able to initiate photocatalysis) and organic or carbonaceous aerosols (which contain aromatic compounds or humic like substances able to act as photosensitizers). Additionally, direct photochemistry of unconventional precursors, i.e., iron-dicarboxylic acid anionic complexes, will also be dealt with. 

The formation of highly reactive intermediates from the photolysis of aromatic azides favor their use for surface modification and the preparation of substrates for solid phase reactions. Thus, azide photochemistry has been exploited for facile modification of graphitic surfaces and N-5-azidonitrobenzoyloysuccinimide undergoes photoaddition in a solid state reaction. A review on the covalent functionalization of graphene includes examples via photogenerated nitrenes. ... 

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