Applied Photochemistry: When Light Meets Molecules by Giacomo Bergamini, Serena Silvi

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By Giacomo Bergamini, Serena Silvi

This monograph beneficial properties what occurs whilst mild meets molecules. This edited quantity includes contributions from a world array of participants, and it truly is divided into sections representing a variety of conscientiously focussed and hooked up photochemistry subject matters: power, know-how, drugs, environmental sciences, and artwork. In each one part a number of chapters illustrates appropriate elements of every box, equivalent to man made photosynthesis and solar power conversion (energy), gentle emitting units and photochromic dyes (technology), and photodynamic remedy and sun filters (medicine). geared toward scholars of all degrees and researchers lively in photochemistry.

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A molecule that undergoes decomposition upon reduction. , [Co(NH)5Cl]2+). A large amount of work is available on molecular water oxidation catalysts and their application. Many of these studies involve water oxidation catalysis under dark conditions, either electrochemical or taking advantage of chemical oxidants such as cerium salts. Herein we will concentrate only on molecular water oxidation catalysts which have been coupled to a photochemical system to power light-driven water oxidation to dioxygen.

On the other hand, in the case of the tetranuclear dendrimer a reverse mechanism is observed, which involves reductive quenching of the sensitizer by the catalyst as the primary step followed by electron shift to the sacrificial acceptor (Fig. 30b) [93]. Importantly, in both cases complementary charge interactions between the positively charged sensitizers, either h È É i8þ Ru(bpy)32+ or Ru ðμ-2, 3-dppÞRuðbpyÞ2 3 , and the negatively charged catalyst 1 Supramolecular Artificial Photosynthesis 37 WOC1 were observed, leading to strong quenching of the sensitizer emission.

Interestingly, WOC6 was even active when Ru(dmb)32+ (where dmb ¼ 4,40 -dimethyl2,20 -bipyridine) was used as the sensitizer, whose oxidized species Ru(dmb)33+ (obtained upon irradiation of Ru(dmb)32+ in the presence of the sacrificial acceptor) is a milder oxidant than Ru(bpy)33+, thus emphasizing the low operating potential of this class of catalysts. Supramolecular triad systems (WOC7-8, Fig. 35) coupling either a Ru(bpy)32+or Ru(tpy)22+-type chromophores to a WOC6-type catalyst were also studied as photochemical devices for light-driven water oxidation in the presence of persulfate [104].

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