Formation of dimer radical cation of 1,1-dianisylethylene through two-step hole transfer processes during TiO2 photocatalytic reactions

2004 ◽  
Vol 45 (19) ◽  
pp. 3753-3756 ◽  
Author(s):  
Takashi Tachikawa ◽  
Sachiko Tojo ◽  
Mamoru Fujitsuka ◽  
Tetsuro Majima
Keyword(s):  
Radical Cation ◽  
Hole Transfer ◽  
Transfer Processes ◽  
Photocatalytic Reactions ◽  
Dimer Radical Cation

Formation of the Dimer Radical Cation of Aromatic Sulfide on the TiO2Surface during Photocatalytic Reactions

Langmuir ◽  
2004 ◽  
Vol 20 (11) ◽  
pp. 4327-4329 ◽  
Author(s):  
Takashi Tachikawa ◽  
Sachiko Tojo ◽  
Mamoru Fujitsuka ◽  
Tetsuro Majima
Keyword(s):  
Radical Cation ◽  
Aromatic Sulfide ◽  
Photocatalytic Reactions ◽  
Dimer Radical Cation

Hole Transfer Processes in meta- and para-Conjugated Mixed Valence Compounds: Unforeseen Effects of Bridge Substituents and Solvent Dynamics

2017 ◽  
Vol 139 (17) ◽  
pp. 6200-6209 ◽  
Author(s):  
Julian Schäfer ◽  
Marco Holzapfel ◽  
Boryana Mladenova ◽  
Daniel Kattnig ◽  
Ivo Krummenacher ◽  
...  
Keyword(s):  
Mixed Valence ◽  
Hole Transfer ◽  
Transfer Processes ◽  
Solvent Dynamics ◽  
Mixed Valence Compounds

Reactivity and Thermochemical Properties of the Water Dimer Radical Cation in the Gas Phase

1995 ◽  
Vol 99 (42) ◽  
pp. 15444-15447 ◽  
Author(s):  
Sam P. de Visser ◽  
Leo J. de Koning ◽  
Nico M. M. Nibbering
Keyword(s):  
Gas Phase ◽  
Radical Cation ◽  
Water Dimer ◽  
Thermochemical Properties ◽  
Dimer Radical Cation

Near-Infrared Excitation of the peri-Xanthenoxanthene Radical Cation Drives Energy-Demanding Hole Transfer Reactions

2018 ◽  
Vol 122 (41) ◽  
pp. 23364-23370 ◽  
Author(s):  
Joseph A. Christensen ◽  
Jinyuan Zhang ◽  
Jiawang Zhou ◽  
Jordan N. Nelson ◽  
Michael R. Wasielewski
Keyword(s):  
Radical Cation ◽  
Near Infrared ◽  
Transfer Reactions ◽  
Hole Transfer ◽  
Infrared Excitation

Light-induced hole transfer in a hypervalent phosphorus(V) octaethylporphyrin bearing an axially linked bis(ethylenedithio)tetrathiafulvalene

2010 ◽  
Vol 14 (02) ◽  
pp. 178-187 ◽  
Author(s):  
Prashanth K. Poddutoori ◽  
Ann Dion ◽  
Songjie Yang ◽  
Melanie Pilkington ◽  
John D. Wallis ◽  
...  
Keyword(s):  
Steady State ◽  
Fluorescence Quenching ◽  
Radical Cation ◽  
High Efficiency ◽  
Chemical Oxidation ◽  
Reference Compound ◽  
Epr Spectrum ◽  
Hole Transfer ◽  
Time Resolved ◽  
Epr Measurements

A phosphorus(V) porphyrin bearing an axially linked bis(ethylenedithio)tetrathiafulvalene, dyad 1, and its radical cation phosphorus(V) porphyrin- O-CH2 -(bis(ethylenedithio)tetrathiafulvalene)+•, dyad 2, have been synthesized and studied as an electron hole donor-acceptor system. The absorption spectrum of dyad 1 does not show evidence for electronic coupling between the porphyrin and the bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) moieties. However, the steady-state fluorescence of the porphyrin chromophore is quantitatively quenched and its transient fluorescence lifetime is shortened compared to a reference compound in which the BEDT-TTF moiety is replaced by a methoxy group. Chemical oxidation of the BEDT-TTF moiety in dyad 1 to give dyad 2 results in recovery of the fluorescence intensity. This behavior suggests that the fluorescence quenching in dyad 1 is the result of intramolecular hole transfer from the the excited porphyrin to the BEDT-TTF moiety. The occurence of hole transfer in dyad 1 is confirmed by freeze-trapping and time-resolved electron paramagnetic resonance (EPR) measurements. The freeze-trapping EPR experiments show that steady-state irradiation of the complex leads to accumulation of its radical cation (dyad 2) while the transient EPR measurements at 5 °C show that flash irradiation of dyad 1 results in formation of a radical-ion pair with a lifetime of at least 300 ns. The triplet state of the porphyrin, which is formed by intersystem crossing and gives a strong transient EPR spectrum in the reference compound, is not observed for dyad 1. Together, the fluorescence quenching and the polarization pattern of the radical pair suggest that the hole transfer occurs from the excited singlet state of the porphyrin with high efficiency.

Structures and stabilities of asymmetrical dimer radical cation systems (AH3–H2O)+ (A=N, P, As)

2014 ◽  
Vol 26 (1) ◽  
pp. 109-119 ◽  
Author(s):  
Li Fei Ji ◽  
An Yong Li ◽  
Zhuo Zhe Li
Keyword(s):  
Radical Cation ◽  
Dimer Radical Cation

Formation of Pyrene Dimer Radical Cation at the Minor Groove of DNA

2006 ◽  
Vol 79 (2) ◽  
pp. 312-316 ◽  
Author(s):  
Kiyohiko Kawai ◽  
Takumi Kimura ◽  
Hiroko Yoshida ◽  
Akira Sugimoto ◽  
Sachiko Tojo ◽  
...  
Keyword(s):  
Radical Cation ◽  
Minor Groove ◽  
Dimer Radical Cation
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