The photo-initiation of the polymerization of vinyl compounds by means of cerous ions

1963 ◽  
Vol 275 (1361) ◽  
pp. 161-174 ◽  
Keyword(s):  
Electron Transfer ◽  
Fluorescence Quenching ◽  
Methacrylic Acid ◽  
Polymerization Reaction ◽  
Hydrogen Ions ◽  
Transfer Processes ◽  
Flash Technique ◽  
Electron Transfer Processes ◽  
Kinetics Of

The kinetics of the polymerization of acrylonitrile and methacrylic acid photosensitized by cerous ions have been studied. Cerous salts have been photolyzed in different media by means of the flash technique and ceric ions were produced, accompanied by fluorescence. Quenching of the fluorescence of the excited ceric species has been investigated with and without the presence of monomer and it has been demonstrated that hydrogen ions are necessary for the polymerization reaction to proceed. The results are consistent with the following electron transfer processes: Ce 3+ . HOH + hv ^+ (Ce 4+ . HOH - )*, Ce 4+ . HOH - )* hv ^+ Ce 3+ . HOH+ hv ", Ce 4+ . HOH - )* +H + ->Ce 4+ . H 2 O+H', Ce 4+ . HOH - )* +H + + M ->Ce 4+ +H 2 M H', where M = monomer.

scholarly journals Electron transfer processes of coadsorbed Anthracene and N,N-Dimethylaniline on titania-silica

2004 ◽  
Vol 6 (1) ◽  
pp. 11-16 ◽  
Author(s):  
Anna Eremenko ◽  
Natalie Smirnova ◽  
Oksana Yakimenko ◽  
Galina Starukh ◽  
David R. Worrall ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Competitive Adsorption ◽  
Co Adsorption ◽  
Decay Kinetics ◽  
Electron Transfer Process ◽  
Adsorption Sites ◽  
Transfer Processes ◽  
Pure Silica ◽  
Electron Transfer Processes ◽  
Kinetics Of

The effect of titania-silica binaries on the processes of PET and the decay kinetics of the Anthracene (An) fluorescence and An radical cation in presence of the co-adsorbed electron donor N,Ndimethylaniline (DMA) has been studied. The fluorescence of excited An adsorbed on pure silica is quenched by the addition of DMA, while co-adsorption of DMA on Ti/Si binaries resulted in increase of fluorescence intensity of adsorbed An. We suggest that competitive adsorption between DMA and An results in DMA occupying more active “titania” sites causing the shift of An molecules to weaker adsorption sites located on the silica support. An and DMA molecules being adsorbed simultaneously on the surface, effectively produce reduced titanium ions due to an electron transfer process. These data appear to lend weight to the suggestion of a pre-exciplex An-DMA state on the surface and effective PET from the excited molecular pair to the acceptor sites on the surface. These sites may be titania aggregates, or titania ions when there is a low content of Ti in the binaries.

Mechanistic Studies of Fc-PNA(⋅DNA) Surface Dynamics Based on the Kinetics of Electron-Transfer Processes

2011 ◽  
Vol 17 (35) ◽  
pp. 9678-9690 ◽  
Author(s):  
Nina Hüsken ◽  
Magdalena Gębala ◽  
Fabio La Mantia ◽  
Wolfgang Schuhmann ◽  
Nils Metzler-Nolte
Keyword(s):  
Electron Transfer ◽  
Surface Dynamics ◽  
Mechanistic Studies ◽  
Transfer Processes ◽  
Electron Transfer Processes ◽  
Kinetics Of

Zinc Porphyrin–Re(I) Bipyridyl–Fullerene Triad: Synthesis, Characterization, and Kinetics of the Stepwise Electron-Transfer Processes Initiated by Visible Excitation

2014 ◽  
Vol 54 (1) ◽  
pp. 280-292 ◽  
Author(s):  
Paolo Cavigli ◽  
Tatiana Da Ros ◽  
Axel Kahnt ◽  
Marta Gamberoni ◽  
Maria Teresa Indelli ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Zinc Porphyrin ◽  
Transfer Processes ◽  
Electron Transfer Processes ◽  
Kinetics Of
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