scholarly journals Elucidating light-induced charge accumulation in an artificial analogue of methane monooxygenase enzymes using time-resolved X-ray absorption spectroscopy

2017 ◽  
Vol 53 (18) ◽  
pp. 2725-2728 ◽  
Author(s):  
Dooshaye Moonshiram ◽  
Antonio Picón ◽  
Alvaro Vazquez-Mayagoitia ◽  
Xiaoyi Zhang ◽  
Ming-Feng Tu ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Charge Accumulation ◽  
Time Resolved ◽  
X Ray ◽  
Transfer Processes ◽  
System P ◽  
Photocatalytic System ◽  
Induced Charge ◽  
Electron Transfer Processes ◽  
X Ray Absorption

Probing the light-induced two electron transfer processes at a diiron(iii,iii) multimolecular photocatalytic system.

Time-resolved measurements of electron transfer processes at the PTCDA/Ag(111) interface

2010 ◽  
Vol 75 (1) ◽  
pp. 23-30 ◽  
Author(s):  
C. H. Schwalb ◽  
M. Marks ◽  
S. Sachs ◽  
A. Schöll ◽  
F. Reinert ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Time Resolved ◽  
Transfer Processes ◽  
Electron Transfer Processes ◽  
Time Resolved Measurements

Crystal-Structures of Three Long, Rigid, Norbornylogous Compounds of Relevance to Distance-Dependence Studies of Long-Range Intramolecular Electron-Transfer Processes

1987 ◽  
Vol 40 (12) ◽  
pp. 1951 ◽  
Author(s):  
DC Craig ◽  
MN Paddonrow
Keyword(s):  
Electron Transfer ◽  
Crystal Structures ◽  
Dipole Moments ◽  
Intramolecular Electron Transfer ◽  
Time Resolved ◽  
Transfer Processes ◽  
Distance Dependence ◽  
Molecular Backbone ◽  
Predicted Values ◽  
Electron Transfer Processes

Results of previous studies revealed that photoinduced intramolecular electron transfer between the dimethoxynaphthalene donor and dicyanomethylene acceptor groups in the series of rigid alicyclic compounds (2a)-(6a) is extremely rapid. As the first step towards determining the distance dependence of the rate of photoinduced intramolecular electron transfer in these molecules, crystal structures of (3a), (4b) and (5b), have been measured. The edge-to-edge distance between the two chromophores in (3a), (4b) and (5b) is 6.8, 9.4, and 11.5 � respectively. The estimated centre-to-centre separation between the chromophores in (2a)-(6a) ranges from c. 7.1 � in (2a) to c. 14.9 � in (6a). From these results, dipole moments of the charge-separated states of (2a)-(6a), following photoinduced intramolecular electron transfer, could be estimated. These predicted values were in excellent agreement with those determined experimentally by using the time-resolved microwave conductivity technique. An interesting structural feature of (3a), (4b) and (5b) is the pronounced curvature of the molecular backbone in these molecules. It is predicted that approximately 24 linearly fused norbornyl and bicyclo[2.2.0] units would complete a circle, forming a member of a novel class of macrocycles, tentatively called dogcollaranes.

One-electron transfer processes in the reaction of elemental gallium, indium, and tin with tetrahalogeno-ortho-benzoquinones

1989 ◽  
Vol 67 (11) ◽  
pp. 1807-1814 ◽  
Author(s):  
Theodore A. Annan ◽  
Dennis G. Tuck
Keyword(s):  
Electron Transfer ◽  
Reaction Mechanism ◽  
Paramagnetic Species ◽  
X Ray ◽  
Transfer Processes ◽  
Electron Transfer Processes ◽  
Derivatives Of

Tin reacts with tetrahalogeno-o-benzoquinones X4C6O2 (X = Cl, Br) in refluxing toluene to give the tin(IV) catecholato species Sn(O2C6X4)2, and neutral and anionic derivatives have also been obtained. A mixture of Sn + X4C6O2-o + I2 + 1,10-phenanthroline (phen) yields SnI2(O2C6X4)phen. With gallium or indium (= M), the corresponding experiments give derivatives of MII (e.g., [M(O2C6X4)phen]2), or MIII (e.g., MI(O2C6X4)phen). Intermediate paramagnetic species were detected in the case of [Formula: see text], and a reaction mechanism involving one-electron transfer processes is proposed on the basis of these results. Solvated crystals of the compound InCl(O2C6Cl4)(C6H7N)3 were obtained from CH2Cl2 solution, and the structure of this molecule has been determined by X-ray crystallographic methods. Keywords: gallium, indium, tin, benzoquinones, oxidation.

Intramolecular photoinduced electron transfer in cobalt(II) chlathrochelate-zinc porphyrin assemblies leading to long-lived Co(I) species

2014 ◽  
Vol 18 (12) ◽  
pp. 1125-1130 ◽  
Author(s):  
Sanae El Ghachtouli ◽  
Régis Guillot ◽  
Winfried Leibl ◽  
Ally Aukauloo
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Synthesis And Characterization ◽  
Electrochemical Studies ◽  
Charge Accumulation ◽  
Zinc Porphyrin ◽  
X Ray ◽  
Induced Charge ◽  
Cobalt Center

We report herein the synthesis and characterization of novel cobalt chlathrochelate-zinc porphyrin assemblies. X-ray data and electrochemical studies support the formation and maintenance of these structures both in solid and solution states. Light induced charge accumulation at the cobalt center was realized in the presence of a sacrificial electron donor. The photogenerated Co(I) species was stable in the ms time scale in aqueous medium.

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