New iridium complexes stabilized by three diphosphine ligands were synthesized and characterized and their reactivity toward small molecules was studied. Chloro(1,5-cyclooctadiene)iridium(I) dimer reacted with the ligand 1,2-bis(diphenylphosphino)benzene (dppb), cis-1,2-bis(diphenylphosphino)ethylene (dppey) or bis(2-diphenylphosphinophenyl)ether (dppper) in a ratio of 1:2 in toluene to produce [Ir(COD)(dppb)Cl] (1 ), [Ir(COD)(dppey)Cl] (2 ) and [Ir(COD)(dppper)Cl] (3 ) respectively. These complexes can readily be isolated as their tetraphenylborate salts (4 -6 ). Reactions of 4  and 5 with small molecules such as CO, H2, and HCl resulted in the formation of iridium carbonyl, monohydride and dihydride complexes. The reactions of compounds 4 , 5 , and 6  with primary and secondary silanes showed that they were able to oligomerize silanes and release molecular hydrogen, which then reacted with these complexes to produce a mixture of cis- and -trans-iridium dihydride complexes.

Iridium(III) hydride complexes with bidentate phosphines: Synthesis, characterization and reactivity

247th National Meeting (2014)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.