Photoinduced electron transfer in a triarylamine-organoboron-Ru(2,2′-bipyridine) 3 2+ compound
作者:Luisa G. Heinz、Oliver S. Wenger
DOI:10.1016/j.crci.2015.08.007
日期:2017.3
Long-range electrontransfer reactions play a key role in biological photosynthesis, and they are likely to play an important role for future artificial photosynthetic endeavors as well. The possibility to control the rates for long-range electrontransfer with external stimuli is of particular interest in this context. In the work presented herein, we explored a donor–bridge–acceptor compound in which
Fundamentally Different Distance Dependences of Electron-Transfer Rates for Low and High Driving Forces
作者:Svenja Neumann、Oliver S. Wenger
DOI:10.1021/acs.inorgchem.8b02973
日期:2019.1.7
The distance dependences of electron-transfer rates (kET) in three homologous series of donor–bridge–acceptor compounds with reactionfreeenergies (ΔGET0) of ca. −1.2, −1.6, and −2.0 eV for thermal chargerecombination after initial photoinducedchargeseparation were studied by transient absorption spectroscopy. In the series with low driving force, the distance dependence is normal and kET decreases
电子传递速率(k ET)在三个同源系列的供体-桥-受体化合物中的自由电子的距离相关性,其反应自由能为(ΔG ET 0)。通过瞬态吸收光谱研究了初始光诱导电荷分离后热电荷重组的-1.2,-1.6和-2.0 eV。在低驱动力的系列中,距离相关性是正常的,并且随着供体-受体距离(r DA)的延长,k ET减小。在两个具有更高驱动力的系列中,k ET在一定范围内随着距离的增加而增加。这种与直觉相反的行为可以通过弱依赖距离的电子供体-受体耦合(H DA)和增加的重组能量(λ)来解释。我们的研究表明,高能电子转移的距离依赖性与较普遍研究的弱能电子反应的距离依赖性大不相同。
Distance Dependence of Bidirectional Concerted Proton-Electron Transfer in Phenol-Ru(2,2′-bipyridine)<sub>3</sub><sup>2+</sup>Dyads
作者:Jing Chen、Martin Kuss-Petermann、Oliver S. Wenger
DOI:10.1002/chem.201304256
日期:2014.4.1
of this bidirectionalconcertedproton–electrontransfer (CPET) reaction were studied as a function of phenol–Ru(bpy)32+ distance by increasing the number of bridging p‐xylene units. A distance decay constant (β) of 0.67±0.23 Å−1 was determined. The distancedependence of the rates for CPET is thus not significantly steeper than that for ordinary (i.e., not proton coupled) electron transfer across the
Stepwise Photoinduced Electron Transfer in a Tetrathiafulvalene‐Phenothiazine‐Ruthenium Triad
作者:Michael Skaisgirski、Christopher B. Larsen、Christoph Kerzig、Oliver S. Wenger
DOI:10.1002/ejic.201900453
日期:2019.10.31
on exTTF. MV2+ clearly oxidized [Ru(bpy)3]+ and thereby re‐instated ground‐state [Ru(bpy)3]2+ in triads in which exTTF had been oxidized to exTTF·+, but further excitation of the solution containing the exTTF·+‐PTZ‐[Ru(bpy)3]2+ photoproduct did not provide evidence for exTTF2+. Nevertheless, it seems that the design principle of a covalent donor‐donor‐sensitizer triad (as opposed to simpler donor‐sensitizer
Exploiting Potential Inversion for Photoinduced Multielectron Transfer and Accumulation of Redox Equivalents in a Molecular Heptad
作者:Julia Nomrowski、Oliver S. Wenger
DOI:10.1021/jacs.8b02443
日期:2018.4.25
doubly charge-separated photoproduct is 0.5%. In acidic oxygen-free solution, the reduction product is a stable dithiol. Under steady-state photoirradiation, our heptad catalyzes the two-electronreduction of an aliphatic disulfide via thiolate-disulfide interchange. Exploitation of potential inversion for the reversible light-driven accumulation of redox equivalents in artificial systems is unprecedented