Types Of Hydrogen Bonding
Chemical Bonding of Class 11
TYPES OF HYDROGEN BONDING
Intermolecular hydrogen bonding:
This type of bonding takes place between two molecules of the same or different types. For example,
Inter molecular hydrogen bonding leads to molecular association in liquids like water etc. Thus in water only a few percent of the water molecules appear not to be hydrogen bonded even at 90°C. Breaking of those hydrogen bonds throughout the entire liquid requires appreciable heat energy. This is indicated in the relatively higher boiling points of hydrogen bonded liquids. Crystalline hydrogen fluoride consists of the polymer (HF)n. This has a zig-zag chain structure involving H-bond.
Intramolecular hydrogen bonding:
This type of bonding occurs between atoms of the same molecule present on different sites. Intramolecular hydrogen bonding gives rise to a closed ring structure for which the term chelation is sometimes used. Examples are, o-nitrophenol, salicylaldehyde.