Synergic Influence of Reverse Micelle Confinement on the Enhancement in Photoinduced Electron Transfer to and from Carbon Nanoparticles

2015 ◽  
Vol 119 (24) ◽  
pp. 13887-13892 ◽  
Author(s):  
Somen Mondal ◽  
Tarasankar Das ◽  
Arnab Maity ◽  
Sourav Kanti Seth ◽  
Pradipta Purkayastha
Keyword(s):  
Electron Transfer ◽  
Reverse Micelle ◽  
Photoinduced Electron Transfer ◽  
Carbon Nanoparticles

Photooxidation of 9,10-diethoxyanthracene: mechanistic dichotomies between homogeneous solution and reverse micelle photoprocesses

1990 ◽  
Vol 68 (4) ◽  
pp. 612-619 ◽  
Author(s):  
R. J. DeVoe ◽  
M. R. V. Sahyun ◽  
E. Schmidt ◽  
D. K. Sharma
Keyword(s):  
Electron Transfer ◽  
Fluorescence Quenching ◽  
Reverse Micelle ◽  
Photoinduced Electron Transfer ◽  
Reverse Micelles ◽  
Heavy Atom ◽  
Homogeneous Solution ◽  
Intersystem Crossing ◽  
Primary Mechanism ◽  
Atom Effect

We have compared the photooxidation of the title compound, DEA, by diphenyliodonium salts in homogeneous acetonitrile (AN) and in heptane/AOT/water reverse micelle solutions. The reaction is efficient, which we attribute to rapid (ca. 10 ps) deethylation of the DEA radical cation, initially formed by photoinduced electron transfer. In AN, the electron transfer occurs from singlet excited DEA, but in reverse micelles it is gated by intersystem crossing to triplet DEA. Under these conditions, DEA fluorescence quenching by the iodonium cation may still be observed; we infer operation of the external heavy atom effect as the primary mechanism. Keywords: anthracene, electron transfer, reverse micelle, photochemistry, picosecond.

Surfactant chain length controls photoinduced electron transfer in surfactant bilayer protected carbon nanoparticles

2015 ◽  
Vol 141 ◽  
pp. 252-254 ◽  
Author(s):  
Somen Mondal ◽  
Tarasankar Das ◽  
Prasun Ghosh ◽  
Arnab Maity ◽  
Arabinda Mallick ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Chain Length ◽  
Photoinduced Electron Transfer ◽  
Carbon Nanoparticles

pH triggered reversible photoinduced electron transfer to and from carbon nanoparticles

2014 ◽  
Vol 50 (52) ◽  
pp. 6890 ◽  
Author(s):  
Somen Mondal ◽  
Manjunath Chatti ◽  
Arabinda Mallick ◽  
Pradipta Purkayastha
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Carbon Nanoparticles

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...

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