When a group containing a hydrogen atom is covalently bonded to an electronegative atom, such as O2 or nitrogen favours hydrogen bonding. A hydrogen bond is formed when an H2 atom shares electrons with two neighbouring atoms, that is, oxygen and nitrogen.
Example: Hydrogen atom of one peptide shares its electron with the carbonyl atom of another peptide.
The interaction occurs between C—O and proton of an NH— or OH group with the distance of about 2.8Å.
Example: Silk fibrion
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