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Is electrostatics sufficient to describe hydrogen-bonding interactions?
Johannes Hoja1, Alexander F Sax, Krzysztof Szalewicz
1Department of Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz (Austria).
Chemistry (Weinheim an Der Bergstrasse, Germany)
|January 24, 2014
Summary
Hydrogen-bonded dimer stability is influenced by substituents, not just electrostatics. Dispersion interactions, especially with larger groups, significantly impact stability, often more than electrostatic forces alone.
Area of Science:
- Chemical Physics
- Computational Chemistry
- Molecular Interactions
Background:
- Hydrogen-bonded dimers traditionally focus on central A-H⋅⋅⋅B moieties and electrostatic interactions.
- The impact of substituents and non-electrostatic forces on hydrogen bond stability is understudied.
Purpose of the Study:
- To analyze the interaction energy in water and alcohol dimers.
- To investigate the role of substituents and dispersion forces in hydrogen-bonded complex stability and geometry.
Main Methods:
- Symmetry-adapted perturbation theory (SAPT) was employed for interaction energy analysis.
- Evaluated interaction energies in water dimer and various alcohol dimers.
Main Results:
- Substituent size and shape significantly affect hydrogen-bonded complex stabilization.
- Attractive dispersion interactions become substantial with larger, bulkier substituents, matching total stabilization energy.
- Electrostatics alone are insufficient for predicting hydrogen bond stability trends across the studied dimers.
Conclusions:
- Dispersion interactions are crucial for understanding hydrogen bond stability trends in dimers.
- Non-electrostatic forces, particularly dispersion, play a more significant role than previously emphasized.
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