Hydrogen bonds can form between regions of polar molecules that are oppositely charged.
For a hydrogen bonds to form, a molecule that has hydrogen attached to an atom of high electronegativity and another molecule that has another electronegative atom with high electronic density (that is, a negative partial charge) is required.
When both molecules are brought together by hydrogen, a weak bond called a hydrogen bridge is generated.
A molecule is a dipole when there is an asymmetric distribution of electrons because the molecule is made up of atoms of different electronegativity.
As a consequence, the electrons are preferably in the vicinity of the most electronegative atom.
This creates two regions (or poles) in the molecule, one with a negative partial charge and the other with a positive partial charge
The bonds will be the more polar the greater the difference in electronegativity between the bonded atoms.
Therefore, we can conclude the hydrogen bonds can form between regions of polar molecules that are oppositely charged, having opposite charges, these two parts of the atom attract each other.
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