ИСТИНА

Transition metal coordination compounds containing the borohydride ligand, BH4 or LBH3 (L = amine), are an important class of compounds possessing many valuable properties and useful applications. In this contribution we will report the results of combined spectroscopic and computational studies on the mechanisms of off-metal and on-metal reactions of boron hydrides with XH acids leading to H2 discharge.[1-5] Involvement of nonclassical hydrogen bonds BH∙∙∙HX[1] in the reaction cycle will be discussed. The presence of several types of hydride ligands (MH, BHterm, BHbr) leads to a variety of mono-, bi- and trifurcate dihydrogen bonded complexes, only few of which are the proton transfer reaction intermediates[2-4]. The influence of coordination to the metal on the BH proton accepting ability and on the mechanism of the reactions involving proton transfer as a key step will be discussed. Crucial role of additional Lewis acidic centers in the reactivity of these complexes will be shown. Possible mechanisms of their transformation leading to H2 evolution will be discussed including the mechanism of amine-boranes dehydrogenation