2017
DOI: 10.1002/chem.201701821
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Hydrogen‐Bond Strength of CC and GG Pairs Determined by Steric Repulsion: Electrostatics and Charge Transfer Overruled

Abstract: Theoretical and experimental studies have elucidated the bonding mechanism in hydrogen bonds as an electrostatic interaction, which also exhibits considerable stabilization by charge transfer, polarization, and dispersion interactions. Therefore, these components have been used to rationalize the differences in strength of hydrogen-bonded systems. A completely new viewpoint is presented, in which the Pauli (steric) repulsion controls the mechanism of hydrogen bonding. Quantum chemical computations on the misma… Show more

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Cited by 38 publications
(39 citation statements)
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“…However, the decisive factor is the Pauli repulsion. Despite some small variations, these findings are in line with previous results for similar systems, in which Pauli repulsion determines the hydrogen‐bond strength.…”
Section: Resultssupporting
confidence: 92%
See 1 more Smart Citation
“…However, the decisive factor is the Pauli repulsion. Despite some small variations, these findings are in line with previous results for similar systems, in which Pauli repulsion determines the hydrogen‐bond strength.…”
Section: Resultssupporting
confidence: 92%
“…A potential energy surface scan was performed over the hydrogen‐bond lengths according to the procedure presented in Ref. . Then we decomposed the Δ E int value in every step into physically meaningful energy terms that contribute to the hydrogen‐bond energy: electrostatic, steric interactions, and covalence.…”
Section: Resultsmentioning
confidence: 99%
“…The importance of Pauli repulsion was previously shown for the relative hydrogen-bond length and strength of the GG and CC mismatched base pairs. 37 …”
mentioning
confidence: 99%
“…To rationalize the differences in the Δ E Pauli between the Diels–Alder reactions of CNCC and CCCC , we quantified the most significant interactions between filled orbitals of the dienes and e (Figure a) at a consistent geometry with an average C⋅⋅⋅C bond forming distance of 2.30 Å (which is close, in both energy and position, to both TSs). The highly symmetrical HOMO‐1 of CCCC has a large overlap with the HOMO of e (0.18).…”
Section: Resultsmentioning
confidence: 99%