Hydrogen Bonding|Types of Hydrogen Bonding| Application|2023|AIM Pharma
Hydrogen bonding is a special type of dipole-dipole attraction between molecules, not a covalent bond to a hydrogen atom. It results from the attractive force between a hydrogen atom covalently bonded to a very electronegative atom such as a N, O, or F atom and another very electronegative atom. atom in another molecule.
= O
= N
= H
Hydrogen bonding between two water (H2O) molecules. Note that the O atom in one molecule is attracted to a H atom in the second molecule. Hydrogen bonding between a water molecule and an ammonia (NH3) molecule. Note that the N atom in the NH3 molecule is attracted to a H atom in the H2O molecule.
Physical Consequences of Hydrogen Bonding
At 25oC, nitrosyl fluoride (ONF) is a gas whereas water is a liquid. Why?
ONF and water have about the same shape.
ONF has a higher molecular weight (49 amu) than water (18 amu).
Conclusion: London dispersion forces not responsible for the difference between these two compounds.
ONF and water have the same dipole moment.
Conclusion: dipole-dipole forces not responsible for the difference between these two compounds.
ONF cannot form hydrogen bonds; water can form hydrogen bonds.Hydrogen bond is a electrostatic attraction between a hydrogen atom which is bond to a more electronegative atom such as Nitrogen, Oxygen, fluorine. These are two types of hydrogen bonds :- 1) Intermolecular Hydrogen bonding :- It occurs between two separate molecules. Eq :- H−F...... H−F......
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