Light-induced electron-transfer reactions involving the tris(2,2'-bipyridine)ruthenium dication and related complexes. I. The bis(2,2'-bipyridine)(diethyl 2,2'-bipyridine-4,4'-dicarboxylate)ruthenium dication

1980 ◽  
Vol 33 (8) ◽  
pp. 1643 ◽  
Author(s):  
O Johansen ◽  
A Launikonis ◽  
AWH Mau ◽  
WHF Sasse
Keyword(s):  
Electron Transfer ◽  
Methyl Viologen ◽  
Platinum Catalyst ◽  
Ethylenediaminetetraacetic Acid ◽  
Ester Group ◽  
Transfer Reactions ◽  
Acid Methyl ◽  
Water Rate ◽  
Electron Withdrawal ◽  
Bimolecular Quenching

Irradiation of the bis(2,2'-bipyridine)(diethyl 2,2'-bipyridine-4,4'- dicarboxylate)ruthenium(II) dication (2c) in water, in the presence of ethylenediaminetetraacetic acid, methyl viologen and a platinum catalyst, produces hydrogen at about one-tenth the rate observed with Ru(bpy)32+. This decrease is ascribed to electron withdrawal by the ester group in (2c) and to bimolecular quenching of photo-excited (2c) by water (rate constant 9.3 × 104 1. mol-1 s-1), which follows (in ethanol) Stern-Volmer kinetics (KSV 9.5 x 10-2 1. mol-1).

Luminescence and reactivity of a charge-transfer excited iron complex with nanosecond lifetime

Science ◽  
2018 ◽  
Vol 363 (6424) ◽  
pp. 249-253 ◽  
Author(s):  
Kasper Skov Kjær ◽  
Nidhi Kaul ◽  
Om Prakash ◽  
Pavel Chábera ◽  
Nils W. Rosemann ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Charge Transfer ◽  
Room Temperature ◽  
Iron Complex ◽  
Transfer Reactions ◽  
Carbene Ligands ◽  
Doublet Ground State ◽  
A Charge ◽  
Bimolecular Quenching ◽  
Metal Charge Transfer

Iron’s abundance and rich coordination chemistry are potentially appealing features for photochemical applications. However, the photoexcitable charge-transfer states of most iron complexes are limited by picosecond or subpicosecond deactivation through low-lying metal-centered states, resulting in inefficient electron-transfer reactivity and complete lack of photoluminescence. In this study, we show that octahedral coordination of iron(III) by two mono-anionic facialtris-carbene ligands can markedly suppress such deactivation. The resulting complex [Fe(phtmeimb)2]+, where phtmeimb is {phenyl[tris(3-methylimidazol-1-ylidene)]borate}−, exhibits strong, visible, room temperature photoluminescence with a 2.0-nanosecond lifetime and 2% quantum yield via spin-allowed transition from a doublet ligand-to-metal charge-transfer (2LMCT) state to the doublet ground state. Reductive and oxidative electron-transfer reactions were observed for the2LMCT state of [Fe(phtmeimb)2]+in bimolecular quenching studies with methylviologen and diphenylamine.

Kinetics of electron-transfer reactions between transition-metal complexes and the methyl viologen radical cation

1988 ◽  
Vol 27 (17) ◽  
pp. 2932-2934 ◽  
Author(s):  
Kevin R. Howes ◽  
C. Greg Pippin ◽  
James C. Sullivan ◽  
Dan Meisel ◽  
James H. Espenson ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Transition Metal ◽  
Metal Complexes ◽  
Radical Cation ◽  
Transition Metal Complexes ◽  
Methyl Viologen ◽  
Transfer Reactions ◽  
Electron Transfer Reactions ◽  
Kinetics Of

scholarly journals Development of a proteoliposome model to probe transmembrane electron-transfer reactions

2012 ◽  
Vol 40 (6) ◽  
pp. 1257-1260 ◽  
Author(s):  
Gaye F. White ◽  
Zhi Shi ◽  
Liang Shi ◽  
Alice C. Dohnalkova ◽  
James K. Fredrickson ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Outer Membrane ◽  
Protein Complex ◽  
Methyl Viologen ◽  
Cation Exchanger ◽  
Shewanella Oneidensis ◽  
Model System ◽  
Electron Acceptors ◽  
Transfer Reactions ◽  
Electron Carrier

The mineral-respiring bacterium Shewanella oneidensis uses a protein complex, MtrCAB, composed of two decahaem cytochromes brought together inside a transmembrane porin to transport electrons across the outer membrane to a variety of mineral-based electron acceptors. A proteoliposome system has been developed that contains Methyl Viologen as an internalized electron carrier and valinomycin as a membrane-associated cation exchanger. These proteoliposomes can be used as a model system to investigate MtrCAB function.

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