Fluorescence quenching rate constants, kq, ranging from 106 to 2 × 1010 M−1 sec−1, of more than 60 typical electron donor-acceptor systems have been measured in de-oxygenated acetonitrile and are shown to be correlated with the free enthalpy change, ΔG23, involved in the actual electron transfer process

in the encounter complex and varying between + 5 and −60 kcal/mole. The correlation which is based on the mechanism of adiabatic outer-sphere electron transfer requires ΔG≠23, the activation free enthalpy of this process to be a monotonous function of ΔG23 and allows the calculation of rate constants of electron transfer quenching from spectroscopic and electrochemical data.

A detailed study of some systems where the calculated quenching constants differ from the experimental ones by several orders of magnitude revealed that the quenching mechanism operative in these cases was hydrogen-atom rather than electron transfer.

The conditions under which these different mechanisms apply and their consequences are discussed.

Kinetics of Fluorescence Quenching by Electron and H‐Atom Transfer

An organic electroluminescence element is comprised of a laminate of an anode, a light emitting layer made of an organic compound including phosphorescent materials, an electron transport layer made of an organic compound, and a cathode In the electroluminescence element, a hole blocking layer made of a specific aluminium chelate complex is laminated between the light emitting layer and the electron transport layer.

Organic electroluminescence element

Specific removal of o-methoxybenzyl protection by DDQ oxidation.

Molecular Rods. 1. Simple Axial Rods.

On the selectivity of deprotection of benzyl, mpm (4-methoxybenzyl) and dmpm (3,4-dimethoxybenzyl) protecting groups for hydroxy functions

The Oxidation of Methoxybenzenes

Oxidation, reduction, and electrochemiluminescence of donor-substituted polycyclic aromatic hydrocarbons

Naphthalene 1,8-Disulfide

Wavelength-dependent photochemistry of 2-aroyl-3-aryl-2H-azirines. Mechanistic studies

Cumulative Influence of Dimethylamino Groups on the -System Properties of Aromatic Hydrocarbons

Arnold Zweig

Papers

The Oxidation of Methoxybenzenes

Oxidation, reduction, and electrochemiluminescence of donor-substituted polycyclic aromatic hydrocarbons

Naphthalene 1,8-Disulfide

Wavelength-dependent photochemistry of 2-aroyl-3-aryl-2H-azirines. Mechanistic studies

Cumulative Influence of Dimethylamino Groups on the -System Properties of Aromatic Hydrocarbons