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A '''hydrogen bond''' is an attractive interaction between two species that arises from a link of the form A-H<sup>...</sup>B, where A and B are highly electronegative elements and B possesses a lone pair of electrons. [[Hydrogen bonding]] is conventionally regarded as being limited to N, O, and F but, if B is an anionic species (such as Cl<sup>-</sup>), it may also participate in hydrogen bonding. There is no strict cutoff for an ability to participate in hydrogen bonding, but N, O, and F participate most effectively.
A '''hydrogen bond''' is an attractive interaction between two species that arises from a link of the form A-H<sup>...</sup>B, where A and B are highly electronegative elements and B possesses a lone pair of electrons. Hydrogen bonding is conventionally regarded as being limited to N, O, and F but, if B is an anionic species (such as Cl<sup>-</sup>), it may also participate in hydrogen bonding. There is no strict cutoff for an ability to participate in hydrogen bonding, but N, O, and F participate most effectively.
==Structure==
==Structure==