A particular type of multicenter (three center - four electron) X–H ...Y in which the central hydrogen atom covalently linked to an electronegative atom X
forms an additional weaker bond with atom Y
in the direction of its lone electron pair orbital. The energy of hydrogen bonds, which is usually in the range of
results from the electrostatic interaction and also from the orbital interaction of the antibonding σ*(XH)MO
of the molecule acting as the hydrogen donor and the non-bonding lone electron pair MO
of the hydrogen acceptor molecule.
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook