ИСТИНА

The activity of transition metal hydrides could be influenced by changing the nature of metal, its ligand sphere or reaction conditions. Complexes of iridium(III) with PC(sp3)P ligand proved themselves as good catalysts in such reactions as hydrogen transfer or dehydrogenation of different substrates. In this work we present recent results of spectroscopic (IR, UV, NMR) and theoretical (DFT) investigation of two isomers of iridium(III) complex (PCP)IrH(Cl) (PCP = 1,8-bis-(diisopropylphos-phino)triptycene) showing the difference of their interaction with such substrates as acetonitrile and pyridine. The intra-molecular hydrogen bonding between ligands was found to be the key factor determining the geometry and stability of hexacoordinate complexes that could be considered as models of catalytic reaction intermediates.