title: Benzo annulated cycloheptatriene PCP pincer iridium complexes.
abstract: The benzo annulated cycloheptatriene PCP pincer ligand was prepared in five steps. Treatment of with Ir(CO)3Cl gave the meridional cyclometalated chlorohydrido carbonyl iridium complexes which differ in their arrangement of the H, Cl, and CO ligands around iridium. Storing in THF led to isomerization processes. Hydrogen shifts from the sp(3)-CH carbon bound to iridium into the ligand backbone produced the three isomers . Reductive elimination of HCl from these complexes resulted in the square planar Ir(i) carbonyl complexes . Abstraction of the hydrogen from the sp(3)-CH-Ir fragment could be achieved either by treatment of with Ph3CBF4 or by the elimination of H2 which is initiated by CF3SO3H. The mass spectrometric characterisation of using fast atom bombardment reveals a complex fragmentation pattern. These different "fragment" ions were further investigated by electro-spray ionisation (tandem) mass spectrometry in high and low resolution. The identified compounds were attributed to structures by DFT calculations.
authors.affiliation: Institute of Inorganic Chemistry, University of Tuebingen, Auf der Morgenstelle 18, 72076 Tuebingen, Germany. hermann.mayer@uni-tuebingen.de.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Leis
authors.forename: Sophie
authors.initials: S
authors.lastname: Wernitz
authors.forename: Benedikt
authors.initials: B
authors.lastname: Reichart
authors.forename: David
authors.initials: D
authors.lastname: Ruckerbauer
authors.forename: Johannes Wolfram
authors.initials: JW
authors.lastname: Wielandt
authors.forename: Hermann A
authors.initials: HA
authors.lastname: Mayer
mesh_terms: D056831:Coordination Complexes / Q000737:chemistry*; D007495:Iridium / Q000737:chemistry*; D010720:Phosphines / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D053719:Tandem Mass Spectrometry
chemical_list: D056831:Coordination Complexes; D010720:Phosphines; D007495:Iridium