Lone pairs and hydrogen bonding
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Lone pairs and hydrogen bonding
Are lone pairs required for hydrogen bonding to occur or is it just that lone pairs tend to exist in molecules that can hydrogen bond because these molecules are more likely to have dipole moments?
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Re: Lone pairs and hydrogen bonding
If we think about water, H2O, the Hydrogen doesn't have any lone pairs but is still able to create hydrogen bonding with another H2O molecule by way of the lone pairs on the oxygen atom. So both!
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Re: Lone pairs and hydrogen bonding
In hydrogen bonding, the hydrogen bond donor must have a hydrogen attached to a highly electronegative atom (N,O,F). The hydrogen bond acceptor has a lone pair of electrons on a small highly electronegative atom (N,O,F).
Re: Lone pairs and hydrogen bonding
No, hydrogen bonding does not require a lone pair. It only requires a hydrogen positive side from one molecule and a very negative negative side (usually N,O, or F) from another molecule. An electron pair repulsion would not contribute too much to the polarity since it is temporary and pretty weak (-2Kj/mol vs hydrogen bonding's -20kj/mol)
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