Electrochemical evaluation of electron acceptor materials

1984 ◽  
Vol 62 (10) ◽  
pp. 1877-1885 ◽  
Author(s):  
R. O. Loutfy ◽  
C. K. Hsiao ◽  
B. S. Ong ◽  
B. Keoshkerian
Keyword(s):  
Electron Acceptor ◽  
Methylene Chloride ◽  
Energy Levels ◽  
Mercury Electrode ◽  
Transport Processes ◽  
Reduction Potentials ◽  
Half Wave ◽  
Intermediate Anion ◽  
Wave Reduction ◽  
Anion Radicals

The electrochemical half-wave reduction potential (E1/2) of 33 electron acceptor molecules in dry methylene chloride has been measured by cyclic voltammetry (CV) at a mercury electrode. The differences in E1/2 values for the reversible reduction to the corresponding anion radicals reflect the electronic influence of the substituent at different ring positions.The measurements of the half-wave reduction potentials provided a convenient method for determining the conducting energy levels of the electron relay molecules in condensed media. Repetitive potential cycle measurements provided information on the chemical stability and cyclability of the intermediate anion radicals formed during electron transport processes.

Merostabilization in radical ions, triplets, and biradicals. 4. Substituent effects on the half-wave reduction potentials and n,π* triplet energies of aromatic ketones

1980 ◽  
Vol 58 (23) ◽  
pp. 2537-2549 ◽  
Author(s):  
William J. Leigh ◽  
Donald R. Arnold ◽  
Robert W. R. Humphreys ◽  
Po Cheong Wong
Keyword(s):  
Substituent Effects ◽  
Radical Ions ◽  
Normal Behaviour ◽  
Reduction Potentials ◽  
Half Wave ◽  
Substituent Constants ◽  
Parameter Function ◽  
Two Parameter ◽  
Wave Reduction ◽  
Abinitio Calculations

The half-wave reduction potentials, measured by cyclic voltammetry, and n,π* triplet energies, measured by phosphorescence spectroscopy, were determined for a series of eighteen symmetrically and unsymmetrically substituted benzophenones. Attempts are made to correlate the results with Hammett substituent constants. Better correlations are observed when the data are correlated with a two-parameter function consisting of Hammett substituent constants and a set of substituent parameters describing variations in free radical stability. Significant deviations from "normal" behaviour are observed for benzophenones substituted by both electron-donating and electron-withdrawing substituents. These deviations are attributed to merostabilization of the radical-like species, and an empirical approach designed to evaluate the importance of this effect is developed. Abinitio calculations of molecular orbital energies in meta- and para-substituted benzaldehydes are used to evaluate the substituent effects on E1/2red and ETn,π* in terms of the effect on the energies of the n- and π*-orbitals.

Substituenteneffekte und Störung von π-Systemen, XXXV Radikalanionen Zinn-substituierter Naphthaline/ Substituent Effects and Perturbation of n Systems, XXXV Radical Anions of Tin-Substituted Naphthalenes

1978 ◽  
Vol 33 (11) ◽  
pp. 1223-1226 ◽  
Author(s):  
Hans Bock ◽  
Wolfgang Kaim ◽  
Holger Tesmann
Keyword(s):  
Charge Transfer ◽  
Substituent Effects ◽  
Esr Spectra ◽  
Group Iv ◽  
Ionization Potentials ◽  
Radical Anions ◽  
Spin Distribution ◽  
Reduction Potentials ◽  
Half Wave ◽  
Wave Reduction

Abstract Novel radical anions of trimethylstannyl substituted naphthalenes and their ESR spectra are reported. Both 119 Sn and 117 Sn coupling can be assigned unequivocally. The perturbation of π systems by R3X substituents of group IV b elements X = C, Si, Ge, Sn and Pb is discussed with respect to photoelectron ionization potentials, charge transfer excitations, half-wave reduction potentials and ESR spin distribution.

scholarly journals Origin of the negative shift of half-wave reduction potentials of aromatic polynuclear p-quinones with increasing conjugation.

1985 ◽  
Vol 33 (12) ◽  
pp. 5155-5166 ◽  
Author(s):  
BUNJI UNO ◽  
KENJI KANO ◽  
TOMONORI KONSE ◽  
TANEKAZU KUBOTA ◽  
SANAE MATSUZAKI ◽  
...  
Keyword(s):  
Negative Shift ◽  
Reduction Potentials ◽  
Half Wave ◽  
Wave Reduction

Classification of organic molecules to obtain electron affinities from half wave reduction potentials: The aromatic hydrocarbons

1999 ◽  
Vol 110 (18) ◽  
pp. 9319-9329 ◽  
Author(s):  
Edward S. Chen ◽  
Edward C. M. Chen ◽  
Neeta Sane ◽  
Laura Talley ◽  
Nancy Kozanecki ◽  
...  
Keyword(s):  
Aromatic Hydrocarbons ◽  
Organic Molecules ◽  
Electron Affinities ◽  
Reduction Potentials ◽  
Half Wave ◽  
Wave Reduction

Ring strain effects on half-wave reduction potentials

1969 ◽  
Vol 10 (50) ◽  
pp. 4381-4384 ◽  
Author(s):  
Reuben D. Rieke ◽  
William E. Rich ◽  
Thomas H. Ridgway
Keyword(s):  
Strain Effects ◽  
Ring Strain ◽  
Reduction Potentials ◽  
Half Wave ◽  
Wave Reduction
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