scholarly journals Pioneering and Developing Exciplex Chemistry. Part3. Energy Gap Dependences of Electron Transfer Reactions and Their Roles as well as Roles of Solvent Dependent Exciplex Structures which are of Crucial Importance for Organic Photochemical Reaction Mechanisms.

1994 ◽  
Vol 22 (10) ◽  
pp. 809-816
Author(s):  
Noboru MATAGA
Keyword(s):  
Electron Transfer ◽  
Reaction Mechanisms ◽  
Photochemical Reaction ◽  
Energy Gap ◽  
Transfer Reactions ◽  
Crucial Importance ◽  
Electron Transfer Reactions

Synthesis of Directly Linked Zinc(II) Porphyrin–Imide Dyads and Energy Gap Dependence of Intramolecular Electron Transfer Reactions

2003 ◽  
Vol 9 (12) ◽  
pp. 2854-2866 ◽  
Author(s):  
Naoya Yoshida ◽  
Tomoya Ishizuka ◽  
Katsuyuki Yofu ◽  
Masataka Murakami ◽  
Hiroshi Miyasaka ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Energy Gap ◽  
Transfer Reactions ◽  
Intramolecular Electron Transfer ◽  
Electron Transfer Reactions

scholarly journals Advances in Derivative Voltammetry - A Search for Diagnostic Criteria of Several Electrochemical Reaction Mechanisms

2021 ◽  
Author(s):  
Myung-Hoon Kim
Keyword(s):  
Electron Transfer ◽  
Kinetic Parameters ◽  
Diagnostic Criteria ◽  
Transfer Process ◽  
Reaction Mechanisms ◽  
Transfer Reactions ◽  
Cathodic Peak ◽  
Electron Transfer Reactions ◽  
Reversible Electron Transfer ◽  
Second Derivatives

New methods for analysis of current-potential curves in terms of their derivatives are presented for studying various types of electrode processes – such as simple electron transfer reactions (reversible, quasi-reversible, and irreversible electron transfer) as well as chemically coupled electron transfer reactions along with a diagnostic scheme for differentiating these various types of electrochemical reaction mechanisms. Expressions for first- and higher order derivatives are derived from theoretical analytical solutions for currents for the different types of electrode mechanisms. The derivative curves are analyzed in terms of various parameters which characterize peak shape or peak symmetry with an emphasis on the second derivatives with well-defined anodic and cathodic peaks. Second derivatives can yield, in a simpler manner, the symmetry ratios; i.e., a ratio of anodic to cathodic peak-currents (ipa/ipc), and a ratio of anodic to cathodic peak-widths (Wpa/wpc) and a ratio of anodic to cathodic peak potential differences (ΔEpa/ΔEpc) or a peak separation (Epa-Epc) are evaluated, and these ratio can be related to kinetic parameters associated with a particular types of electrode mechanisms. Peaks are found to be symmetrical for a simple reversible electron transfer process (Er). However, peaks become asymmetrical when the electron transfer become slower (namely, irreversible, Eirr) or e− transfer reaction is coupled with homogeneous chemical reactions such as a prior reaction (CEr) or a follower-up reaction (ECr). From measured values of such symmetry ratios above, one can gain insight to the nature of the electrochemical systems enabling us to determine various kinetic parameters associated with a system. A diagnostic criteria for assigning an electrode mechanism is devised based on the values of asymmetry parameters measured, which are unity for a simple reversible electron transfer process.

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