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In chemistry, a dihydrogen bond is a kind of hydrogen bond, an interaction between a metal hydride bond and an OH or NH group or another proton donor. The first example of this phenomenon is credited to Brown and Heseltine. They observed intense absorption bands in the IR bands at 3300 and 3210 cm-1 for a solution of (CH3)2NHBH3. The higher energy band is assigned to a normal N-H vibration whereas the lower energy band is assigned to the same bond, which is interacting with the B-H. Upon dilution of the solution, the 3300 cm-1 band increased in intensity and the 3210 cm-1 band decreased, indicative of intermolecular association.
Additional recommended knowledge
Formation of a dihydrogen bond is assumed to precede formation of H2 from the reaction of a hydride and a protic acid. A very short dihydrogen bond is observed in NaBH4.2H2O with H---H contacts of 1.79, 1.86, and 1.94 Å. 
This kind of H---H interaction is distinct from the H---H bonding interaction in transition metal complexes having dihydrogen bound to a metal. Another so-called hydrogen hydrogen bond is postulated to exists in certain compounds between two neutral non-bonding hydrogen atoms.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Dihydrogen_bond". A list of authors is available in Wikipedia.|