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Ammonia borane is the chemical compound with the formula H3NBH3. The species is the most fundamental molecular boron-nitrogen compound and has attracted recent attention as a stable storage medium for hydrogen.
Additional recommended knowledge
Properties and structure
It can be described as an hydride of nitrogen and boron, but its behavior indicates that the H atoms attached to boron are hydridic and those attached to nitrogen are somewhat acidic. It is a solid, formally isoelectronic with ethane. Obviously its similarity to ethane is tenuous since borane-ammonia is a solid and ethane is a gas (m.p. −181 °C), their melting points differing by 284 °C. Understanding this difference has been the subject of an ongoing discussion for many years.
The B-N distance is 1.58(2) Å. The B-H and N-H distances are 1.15 and 0.96 Å, respectively.
The structure of the solid indicates a close association of the NH and the BH centers. The original crystallographic analysis of this compound reversed the assignments of B and N. The updated structure was arrived at with improved data using the technique of neutron diffraction that allowed the hydrogen atoms to be located with greater precision.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ammonia_borane". A list of authors is available in Wikipedia.|