Download Applied Photochemistry: When Light Meets Molecules by Giacomo Bergamini, Serena Silvi PDF
By Giacomo Bergamini, Serena Silvi
This monograph positive factors what occurs while mild meets molecules. This edited quantity includes contributions from a global array of members, and it truly is divided into sections representing a range of rigorously focussed and attached photochemistry themes: strength, expertise, drugs, environmental sciences, and artwork. In each one part a number of chapters illustrates correct facets of every box, reminiscent of man made photosynthesis and solar power conversion (energy), mild emitting units and photochromic dyes (technology), and photodynamic treatment and sun filters (medicine). geared toward scholars of all degrees and researchers lively in photochemistry.
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30 Schematic representation of the two possible photochemical pathways leading to catalyst activation and eventually water oxidation: (a) oxidative quenching by the acceptor followed by hole transfer to the catalyst, (b) reductive quenching by the catalyst followed by electron shift to the acceptor 35 a A P *P A– WOC+ WOC P+ b A– A P *P P– WOC WOC+ oxidized sensitizer or catalyst and the reduced acceptor. , 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.
37). In a symmetric fashion with respect to photochemical water oxidation, the holes stored by the donor can be transferred to a suitable oxygen evolving catalyst thus performing water oxidation. , water oxidation), one possibility is that of using a “sacrificial” electron donor, namely a molecule that undergoes decomposition upon oxidation. , triethylamine or triethanolamine), EDTA, thiols, and ascorbic acid. , cobalt, iron, nickel) [111–113] molecular catalysts. Herein we will focus only on some representative molecular catalytic systems which have been employed together with photochemically-active components to power light-driven proton reduction to dihydrogen.
As a general common feature a molecular catalyst should feature one or more metal centers stabilized by a suitable ligand framework. , the reduction potential of the activated catalyst must be more positive than the reduction potential of the O2/H2O redox couple), (ii) the possibility of the catalyst to stabilize high oxidation states via proton-coupled electron-transfer (PCET) processes thus avoiding highly charged intermediates (to this purpose the catalyst must display an aquo ligand or some anchoring site for binding a water molecule),  (iii) the robustness of the ligand pool towards oxidative stress.