Evidence for Resonance-Assisted Hydrogen Bonding from Crystal-Structure Correlations on the Enol Form of the β-Diketone Fragment
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...…-cooperativity involves the polarization of the relatively weak and essentially electrostatic hydrogen-bond interactions, the or RAHB cooperativity occurs with strong hydrogen bonds and is considered by Gilli et al. (1989, 1993a, 1993b) to involve a significant covalent, i.e. exchange, component....
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...H bonds and multiple C:::: N or C:::: O covalent bonds (Gilli et al., 1989)....
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...Similarly it was the work of Gilli et al. (1989; 1993a) on hydrogen bonding involving the O¼C–...
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...Two types of cooperativity have been recognized: -cooperativity, where the hydrogen bonds are linked by covalent O–H bonds, and -cooperativity or Resonance Assisted Hydrogen Bonding* (RAHB), where the hydrogen bonds are linked by both X–H bonds and multiple C:::: N or C:::: O covalent bonds (Gilli et al., 1989)....
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