Photoredox properties

Photopolymerizable coatings relief-image-forming systems, 6,125 Photoreactivity environmental effects, 1, 394 Photoredox properties bipyridyl metal complexes, 2, 90 Photoresist systems, 6,125 Photosensitive materials, 6, 113 Photosynthesis anoxygenic, 6, 589 magnesium and manganese, 6, 588 water decomposition models, 6, 498... 

Luminescent gold(l) acetylide complexes. Photophysical and photoredox properties and crystal structure of [ Au(C = CPh) 2 (p-Ph2PCH2CH2PPh2)]. Journal of the Chemical Society, Dalton Transactions, 2929-2932 (d) Che, C.-M., Wong, W.-T., Lai, T.-F. and Kwong, H.-L. (1989) Novel luminescent binuclear gold(I) isocyanide complexes. Synthesis, spectroscopy, and X-ray crystal structure of Au2(dmh)(CN)2 (dmb = 1,8-di-isocyano-p-menfhane). Journal of the Chemical Society, Chemical Communications, 243-244. 

The reaction requires a sensitizer because water itself does not absorb above 200 nm. Transition-metal complexes exhibiting photoredox properties are useful as sensitizers for this reaction. The main problem, however, is that most transition-metal complexes involve one electron transfer per photon absorbed, whereas the water-splitting reaction... 

During recent years, interest in the bipy (and phen) compounds has been renewed because of their interesting redox and photoredox properties,129 with particular attention being given to the ruthenium compounds130 (see also Chapter 45). In the case of Cu1 compounds of these ligands, many systems have been shown to have strong antimicrobial effects.131... 

It would be a worthwhile experiment to investigate the photoredox properties of those Fe2 bearing clays (e.g., glauconite and fer-rosaponite) that were abundant in the precambrian. 

A number of transition metal complexes exhibit rich photoredox properties, which allow studies of photocleavage of DNA via guanine oxidation [10], photoinduced electron-transfer reactions in metalloproteins [11], and the use... 

The study of photoinduced ET in covalently linked donor-acceptor assemblies began with comparatively simple dyad systems which contain a transition metal center covalently linked to a single electron donor or acceptor unit [26]. However, work in this area has naturally progressed and in recent years complex supramolecular assemblies comprised of one or more metal complexes that are covalently linked to one or more organic electron donors or acceptors have been synthesized and studied [27-36]. Furthermore, several groups have utilized the useful photoredox properties of transition metal complexes to probe electron and energy transfer across spacers comprised of biological macromolecules such as peptides [37,38], proteins [39,40], and polynucleic acids [41]. 

Hill, C. L. Prosser-McCartha, C. M. Photocatalytic and Photoredox Properties of Polyoxometalate Systems. In Photosensitization and Photocatalysis Using Inorganic and Organometallic Compounds, Kalyanasundaram, K., Gratzel, M., Eds. Kluwer Academic Publishers Dordrecht, 1993, pp 307-330. 

The synthesis and photoredox properties of indigo dyes have been described, as have the photochemical reactions of... 

The photoredox properties of porphyrin molecules at interfaces can be studied by time-resolved spectroscopic and photoelectrochemical techniques. A key difference between both approaches is that the latter only probes molecules located at distances from the interface not larger than the characteristic diffusion length of the excited state. According to the Einstein-Smoluchowski equation, the... 

The ability of the MLCT ES in Ru(ll) polypyridyl compounds to undergo facile excited state ET reactions, combined with the stability of the complexes and the tunability of their ES properties, makes this class of compounds attractive candidates for a number of practical applications. Ruthenium(ll) polypyridyl compounds have already found applications in the field of photovoltaics as sensitizers for wide-bandgap semiconductors (such as Ti02) and as photocatalysts for the photochemical splitting of water. Their photophysical and photoredox properties... 

The photoredox properties of 54b have also been studied by oxidative quenching experiments wiA a series of structurally related pyridinium acceptors [138]. The reorganization energy for the electron transfer reaction has been determined to be 1.66(7) eV. The outer-sphere contribution is estimated to be 0.75 eV. The remaining 0.91 eV suggests that there are substantial inner-sphere changes associated with the formation of Au(I)Au(Il) species. This is in line with the observation of a large Stokes shift. 

Hill, C. and Prosser-McCartha, C. (1993). Photocatalytic and Photoredox Properties of Polyoxometalates Systems, in M. Gratzel and K. Kalyanasundaram (eds). Photosensitization and Photocatalysis Using Inorganic andOrganometallic Compounds, Kluwer Academic Publishers, Dordrecht, pp. 307-330. 

Hiskia A, Mylraias A, Papaconstantinou E (2001) Comparison of the photoredox properties of polyoxometalates and semictuiducting particles. Chem Soc Rev 30 62-69... 

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