“…N. Lewis proposed that a covalent bond is brought about by a pair of electrons shared between two atoms [1] and still today the electron pair is central to the chemists view on chemical bonding. [3] Owing to their intrinsically high reactivity, however, most molecules containing one-electron bonds are highly elusive and, in striking contrast to the large body of theoretical knowledge accumulated on such systems in the past decades, the paucity of experimentally characterized examples is remarkable: [4] With two exceptions, [5] experimental evidence has only been gathered for highly sensitive substances by means of elaborate techniques, such as matrix isolation, g-irradiation, H-atom abstraction, or one-electron reduction at low temperatures. [3] Owing to their intrinsically high reactivity, however, most molecules containing one-electron bonds are highly elusive and, in striking contrast to the large body of theoretical knowledge accumulated on such systems in the past decades, the paucity of experimentally characterized examples is remarkable: [4] With two exceptions, [5] experimental evidence has only been gathered for highly sensitive substances by means of elaborate techniques, such as matrix isolation, g-irradiation, H-atom abstraction, or one-electron reduction at low temperatures.…”