Strength of hydrogen bond between hydrogen and Fluorine in Bifluoride - stongest known hydrogen bond

Range >155 kJ/mol
Organism Generic
Reference Emsley, J. (1980). "Very Strong Hydrogen Bonding". Chemical Society Reviews 9: 91–124. doi:10.1039/CS9800900091 p.101 Table 5
Primary Source S. A. Harrell and D. H. McDaniel, Strong Hydrogen Bonds. II. The Hydrogen Difluoride Ion, J. Amer. Chem. SOC., 1964, 86, 4497. DOI: 10.1021/ja01074a061
Method "Waddington was the first to tackle this thorny problem (of strength of H-F bond, ref 31) and suggested the seemingly high value of ca. 240 kJ mol^-1, which was beyond the upper limit of a possible range of 113-230 kJ mol^-1 that Ketelaar had suggested as likely many years before. A minimum value of 155 kJ mol^-1 was deduced from the ?H of reaction: Me4NF(s)+HF(g)?Me4NHF2(s)(primary source). It was reasoned that lattice expansion from Me4NF to Me4NHF2 would be slight and the difference in lattice energies could be ignored, so that the ?H of 155 kJ mol^-1 did represent a likely value for the hydrogen-bond energy."
Entered by Ron Milo - Admin
ID 101067