Was ist Chemische Bindung

Pauli Repulsions Exist Only in the Eye of the Beholder

“…[28] Now to their misunderstanding of the virial theorem and the role of the kinetic energy T. The molecular virial theorem [29] is surely the most abused of all theorems in quantum chemistry, with the Feynman electrostatic theorem [20] running a close second. [30][31][32] Slater regarded these as two of the most powerful theorems applicable to molecules and solids. [33] It is a common fallacy to associate an increase in T with the presence of a repulsion, as done by the present authors.…”

Confirmed by X‐ray Crystallography: The B⋅B One‐Electron σ Bond

“…The chemists view on the chemical bond is usually tied to the concept of shared electron pairs, and not too much experimental evidence exists to challenge this firm belief. [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. 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.…”

“…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.…”

Confirmed by X‐ray Crystallography: The B⋅B One‐Electron σ Bond

“…Yet, as early as 1931 Pauling suggested the existence of one-electron bonds [2] and the simplest of all molecules, the H 2 C + radical cation, is nowadays taken as a role model to explain the detailed physical nature of 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. [6][7][8][9][10][11][12][13][14][15][16] Specifically, radical anions of the type [R 3 B·BR 3 ]C À ([I]C À , Scheme 1; R = H, OMe) were detected.…”