Semiquinones (or ubisemiquinones, if their origin is ubiquinone) are free radicals resulting from the removal of one hydrogen atom with its electron during the process of dehydrogenation of a …

2021年7月31日 · The product of a single-electron transfer leads to what appropriately is called a semiquinone, \(1\), with both a negative charge and an odd electron (a radical anion): The …

The classical semiquinone is a one-electron intermediate between two relatively stable compounds, hydroquinones and quinones. As many free radicals do, also the semiquinone …

Semiquinone radicals can have extremely long half-lives (up to days at 37 °C) and tend to be neither reactive nor toxic. Problems can arise because of propensities to donate the excess …

Semiquinone is defined as a special type of phenoxyl radical that acts as a one-electron intermediate between hydroquinones and quinones, participating in an acid-base equilibrium …

Quinones are redox active molecules that can form semiquinone radicals by a reversible one-electron transfer process that in the presence of oxygen generates superoxide, a reactive …

The quinone/semiquinone/hydroquinone triad (Q/SQ•−/H2Q) represents a class of compounds that has great importance in a wide range of biological processes. The half-cell reduction …

Semiquinone (SQ) intermediates are suggested to be key for the coupling mechanism. Recently, using progressive power saturation and simulation techniques, three distinct SQ species were …

In the solid state, hydration leads to deprotonation of semiquinone to form the semiquinone anion (V or VII) and mobile proton species, traditionally signified on schemes by hydronium cations …

A semiquinone is a radical species formed by the one-electron reduction of a quinone compound. It is an intermediate in the two-electron reduction of a quinone to a hydroquinone, and it plays …