ИСТИНА

Recently we have established that two transition metal hydrides ( tBuPCP)MH (M = Ni, Pd) and LW(H)(CO)3 (L = η5-C5H 5, κ3-N-hydridotris(pyrazolyl)borate) with backward partial charge are able to interact with each other forming the dihidrogen bond (MHδ-···δ+HM’). Then intramolecular proton transfer inside the dihydrogen bonded complex c leads to the release of H2 molecule and the formation of the bimetallic complex [CpW(CO) 2 (µCO)∙∙∙M( tBu PCP)]. Herein we report on the dehydrogenation of amine-boranes (NH3BH3 , Me2NHBH3) catalyzed by Pd/W-bimetallic species via the intermediate complex. The mechanism of dehydrogenation reaction was studied by variable temperature IR (νMH, νCO) and NMR spectroscopy ( 1H, 11B, 31P). Products and intermediates of the interaction were established. The reaction kinetics was monitored under stoichiometric and catalytic conditions using volumetric and spectroscopic (IR, NMR) approaches. The data acquired allow determining the catalytic reaction mechanism and discussing the influence of the ligand L and amine-boranes nature on the parameters of dihydrogen evolution.