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In theoretical chemistry, the charge-shift bond is a proposed new class of chemical bonds that sits alongside the three familiar families of covalent, ionic, and metallic bonds where electrons are shared or transferred respectively. The charge shift bond derives its stability from the resonance of ionic forms rather than the covalent sharing of electrons which are often depicted as having electron density between the bonded atoms. A feature of the charge shift bond is that the predicted electron density between the bonded atoms is low. It has long been known from experiment that the accumulation of electric charge between the bonded atoms is not necessarily a feature of covalent bonds.

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  • Charge-shift bond (en)
  • 電荷シフト結合 (ja)
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  • 電荷シフト結合（でんかシフトけつごう、英: Charge-shift bond）は、結合を介して電子が共有または移動する3つのよく知られている共有結合、イオン結合、金属結合と並んで、新しい化学結合のクラスとして提唱されてきた。電荷シフト結合の安定性は、結合電子間に電子密度を持っていると説明されることが多い電子の共有ではなく、複数のイオン型の共鳴に由来する。電荷シフト結合の特徴は、結合原子の間の予測電子密度が低いことである。長年、結合電子の間の電子密度の蓄積は必ずしも共有結合を特徴付けるものではないことが実験から知られていた。電荷シフト結合が実験的に見出される低い電子密度を説明するために使われてきた一例が、[1.1.1]プロペランの中心の逆四面体形炭素間の結合である。幅広い分子の理論計算は電荷シフト結合の存在を示している。特筆すべき例がフッ素F2分子である。この分子は典型的な共有結合を持つと通常は説明されている。 (ja)
  • In theoretical chemistry, the charge-shift bond is a proposed new class of chemical bonds that sits alongside the three familiar families of covalent, ionic, and metallic bonds where electrons are shared or transferred respectively. The charge shift bond derives its stability from the resonance of ionic forms rather than the covalent sharing of electrons which are often depicted as having electron density between the bonded atoms. A feature of the charge shift bond is that the predicted electron density between the bonded atoms is low. It has long been known from experiment that the accumulation of electric charge between the bonded atoms is not necessarily a feature of covalent bonds. (en)
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  • In theoretical chemistry, the charge-shift bond is a proposed new class of chemical bonds that sits alongside the three familiar families of covalent, ionic, and metallic bonds where electrons are shared or transferred respectively. The charge shift bond derives its stability from the resonance of ionic forms rather than the covalent sharing of electrons which are often depicted as having electron density between the bonded atoms. A feature of the charge shift bond is that the predicted electron density between the bonded atoms is low. It has long been known from experiment that the accumulation of electric charge between the bonded atoms is not necessarily a feature of covalent bonds. An example where charge shift bonding has been used to explain the low electron density found experimentally is in the central bond between the inverted tetrahedral carbon atoms in [1.1.1]propellanes. Theoretical calculations on a range of molecules have indicated that a charge shift bond is present, a striking example being fluorine, F2, which is normally described as having a typical covalent bond. The charge shift bond (CSB) has also been shown to exist at the cation-anion interface of protic ionic liquids (PILs). The authors have also shown how CSB character in PILs correlates with their physicochemical properties. (en)
  • 電荷シフト結合（でんかシフトけつごう、英: Charge-shift bond）は、結合を介して電子が共有または移動する3つのよく知られている共有結合、イオン結合、金属結合と並んで、新しい化学結合のクラスとして提唱されてきた。電荷シフト結合の安定性は、結合電子間に電子密度を持っていると説明されることが多い電子の共有ではなく、複数のイオン型の共鳴に由来する。電荷シフト結合の特徴は、結合原子の間の予測電子密度が低いことである。長年、結合電子の間の電子密度の蓄積は必ずしも共有結合を特徴付けるものではないことが実験から知られていた。電荷シフト結合が実験的に見出される低い電子密度を説明するために使われてきた一例が、[1.1.1]プロペランの中心の逆四面体形炭素間の結合である。幅広い分子の理論計算は電荷シフト結合の存在を示している。特筆すべき例がフッ素F2分子である。この分子は典型的な共有結合を持つと通常は説明されている。 (ja)
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