Projection of the Dynamics of Electron Transfer Reaction in Dual Space onto the One-Dimensional Slower Reaction Coordinate Axis

2015 ◽  
Vol 119 (34) ◽  
pp. 11063-11067 ◽  
Author(s):  
Aniket Patra ◽  
Kanagala Ajay Acharya ◽  
Alok Samanta
Keyword(s):  
Electron Transfer ◽  
Dual Space ◽  
Transfer Reaction ◽  
Electron Transfer Reaction ◽  
Reaction Coordinate ◽  
One Dimensional ◽  
Coordinate Axis ◽  
The One

Vibrational Dephasing along the Reaction Coordinate of an Electron Transfer Reaction

2021 ◽  
Vol 143 (36) ◽  
pp. 14511-14522
Author(s):  
Yusuke Yoneda ◽  
Bryan Kudisch ◽  
Shahnawaz Rafiq ◽  
Margherita Maiuri ◽  
Yutaka Nagasawa ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Transfer Reaction ◽  
Electron Transfer Reaction ◽  
Reaction Coordinate ◽  
Vibrational Dephasing

scholarly journals Electron transfer reaction and demetalation of phthalocyanines

2000 ◽  
Vol 2 (1) ◽  
pp. 9-15 ◽  
Author(s):  
Jean Kossanyi ◽  
Driss Chahraoui
Keyword(s):  
Electron Transfer ◽  
Rate Constant ◽  
Transfer Reaction ◽  
Fluorescence Emission ◽  
Radical Cations ◽  
Electron Transfer Reaction ◽  
Electron Acceptors ◽  
Electron Donors ◽  
Polar Solvents ◽  
The One

An electron-transfer reaction takes place in the ground state between phthalocyanines (as electron-donors) and pyrylium cations (as electron-acceptors) in polar solvents, reaction which leads to the phthalocyanine radical-cations as evidenced by its absorption spectra identical to the one of the species formed by electrochemical oxidation.The fluorescence emission of the phthalocyanines is quenched by electron-acceptors (principally quinones). The free energy changeΔGCTof the electron-transfer reaction has been evaluated for each electron acceptor with a solvation energy of 0.14 eV in the case of dimethylformamide and 1.2 eV in that of dichloromethane. The rate constant of the quenching of the phthalocyanines singlet excited state by a series of electronacceptors is found to be of the order of1.2−1.5×1010L⋅mol-1s-1.Metalated phthalocyanines are demetalated in the dark by hydroxy-anthraquinones with a rate constant of the order of10−2L⋅mol-1s-1at 292K and which increases (up to7×10−2L⋅mol-1s-1at 349 K) with temperature. The activation energy of the demetalation reaction has been determined to be ca 30kJ⋅mol-1for 1,4-dihydroxyanthraquinone and 35kJ⋅mol-1for 1,2,4-trihydroxyanthraquinone.

scholarly journals Electron transfer studies of a conventional redox probe in human sweat and saliva bio-mimicking conditions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
P. Krishnaveni ◽  
V. Ganesh
Keyword(s):  
Electron Transfer ◽  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Transfer Reaction ◽  
Electron Transfer Reaction ◽  
Redox Couple ◽  
Liquid Crystalline Phase ◽  
Transfer Reactions ◽  
Redox Probe ◽  
Human Sweat

AbstractModern day hospital treatments aim at developing electrochemical biosensors for early diagnosis of diseases using unconventional human bio-fluids like sweat and saliva by monitoring the electron transfer reactions of target analytes. Such kinds of health care diagnostics primarily avoid the usage of human blood and urine samples. In this context, here we have investigated the electron transfer reaction of a well-known and commonly used redox probe namely, potassium ferro/ferri cyanide by employing artificially simulated bio-mimics of human sweat and saliva as unconventional electrolytes. Typically, electron transfer characteristics of the redox couple, [Fe(CN)6]3−/4− are investigated using electrochemical techniques like cyclic voltammetry and electrochemical impedance spectroscopy. Many different kinetic parameters are determined and compared with the conventional system. In addition, such electron transfer reactions have also been studied using a lyotropic liquid crystalline phase comprising of Triton X-100 and water in which the aqueous phase is replaced with either human sweat or saliva bio-mimics. From these studies, we find out the electron transfer reaction of [Fe(CN)6]3−/4− redox couple is completely diffusion controlled on both Au and Pt disc shaped electrodes in presence of sweat and saliva bio-mimic solutions. Moreover, the reaction is partially blocked by the presence of lyotropic liquid crystalline phase consisting of sweat and saliva bio-mimics indicating the predominant charge transfer controlled process for the redox probe. However, the rate constant values associated with the electron transfer reaction are drastically reduced in presence of liquid crystalline phase. These studies are essentially carried out to assess the effect of sweat and saliva on the electrochemistry of Fe2+/3+ redox couple.

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