Photoinduced Electron Transfer from Tetrasulfonated Porphyrin to Benzoquinone Revisited. The Structural Volume-Normalized Entropy Change Correlates with Marcus Reorganization Energy†

2006 ◽  
Vol 110 (34) ◽  
pp. 10185-10190 ◽  
Author(s):  
Gabriel O. Andrés ◽  
Víctor Martínez-Junza ◽  
Luis Crovetto ◽  
Silvia E. Braslavsky
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Reorganization Energy ◽  
Entropy Change ◽  
Structural Volume

Singlet and triplet energy splitting in the radical ion pairs generated by photoinduced electron-transfer reactions

2001 ◽  
Vol 73 (3) ◽  
pp. 519-523 ◽  
Author(s):  
Shozo Tero-Kubota
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Continuous Wave ◽  
Ion Pairs ◽  
Reorganization Energy ◽  
Transfer Reactions ◽  
Triplet States ◽  
Energy Splitting ◽  
Triplet Energy ◽  
Electron Transfer Reactions

Chemically induced dynamic electron polarization (CIDEP) spectra generated by photoinduced electron-transfer reactions have been studied using continuous-wave time-resolved EPR and FTEPR spectroscopy. It has been suggested that the energy difference (DEST) between the singlet and triplet states of radical ion pairs (RIPs) is dependent on the charge recombination free energy (­DGCR) and reorganization energy (l). The result is interpreted in terms of the spin-selective stabilization or destabilization of RIP states by electronic coupling with the S0 and locally excited triplet states of the donor­acceptor pair at equilibrium distance in the reaction coordinate. It has been verified that a charge transfer-type exchange interaction governs the DEST. Magnitudes as well as the sign of DEST can be predicted at the distance of the solvent-separated RIP based on DGCR and l values.

Computationally Assisted Design of High Signal-to-Noise Photoinduced Electron Transfer-Based Voltage-Sensitive Dyes

2020 ◽  
Author(s):  
Rishikesh Kulkarni ◽  
Anneliese Gest ◽  
Chun Kei Lam ◽  
Benjamin Raliski ◽  
Feroz James ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Dft Calculations ◽  
Photoinduced Electron Transfer ◽  
Density Functional ◽  
Embryonic Stem ◽  
High Sensitivity ◽  
Md Simulations ◽  
High Signal ◽  
Signal To Noise ◽  
Green Fluorescent

<p>High signal-to-noise optical voltage indicators will enable simultaneous interrogation of membrane potential in large ensembles of neurons. However, design principles for voltage sensors with high sensitivity and brightness remain elusive, limiting the applicability of voltage imaging. In this paper, we use molecular dynamics (MD) simulations and density functional theory (DFT) calculations to guide the design of a bright and sensitive green-fluorescent voltage-sensitive fluorophore, or VoltageFluor (VF dye), that uses photoinduced electron transfer (PeT) as a voltage-sensing mechanism. MD simulations predict an 11% increase in sensitivity due to membrane orientation, while DFT calculations predict an increase in fluorescence quantum yield, but a decrease in sensitivity due to a decrease in rate of PeT. We confirm these predictions by synthesizing a new VF dye and demonstrating that it displays the expected improvements by doubling the brightness and retaining similar sensitivity to prior VF dyes. Combining theoretical predictions and experimental validation has resulted in the synthesis of the highest signal-to-noise green VF dye to date. We use this new voltage indicator to monitor the electrophysiological maturation of human embryonic stem cell-derived medium spiny neurons. </p>

Photoinduced electron transfer in mechanically interlocked suit[3]ane systems

2021 ◽  
Author(s):  
Anton J Stasyuk ◽  
Olga A. Stasyuk ◽  
Miquel Solà ◽  
Alexander Voityuk
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
New Class ◽  
Transfer Processes ◽  
Two Component ◽  
Electron Transfer Processes

Suitanes, a new class of two-component mechanically interlocked systems, have recently been developed. In this work, we report a detailed study of photoinduced electron transfer processes in the suit[3]anes consisting...

Rare-Earth Eu3+/Gold Nanocluster Ensemble-Based Fluorescent Photoinduced Electron Transfer Sensor for Biomarker Dipicolinic Acid Detection

Langmuir ◽  
2021 ◽  
Author(s):  
Ling-Fang Xiu ◽  
Kai-Yuan Huang ◽  
Chen-Ting Zhu ◽  
Qi Zhang ◽  
Hua-Ping Peng ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Rare Earth ◽  
Photoinduced Electron Transfer ◽  
Dipicolinic Acid ◽  
Gold Nanocluster
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