title: Complexation of diazaperylene and bisisoquinoline with transition metal ions in the gas phase studied by electrospray ionization mass spectrometry.
abstract: The complex formation of the ligands 1,12-diazaperylene (dap), 1,1'-bisisoquinoline (bis), 2,2'-bipyridine (bpy) and 1,10-phenanthroline (phen) with transition metal ions (M = Fe, Co, Ni, Cu, Zn, Ru, Os, Re, Pd, Pt, Ag and Cd) in the gas phase has been studied by electrospray ionization mass spectrometry. With the exception of Ru, Os, Fe, Ni and Cu, singly charged complexes [MLn](+) (n = 1,2) were observed. The complexes of dap and bis with Ru, Os, Fe and Ni ions, and the mixed ligand complexes with bpy and phen, are preferably of the doubly charged type [ML3]2+. In addition, collision-induced dissociation (CID) measurements were employed to evaluate the relative stabilities of these complexes. The CID experiments of mixed-ligand complexes which contain both dap and phen or dap and bpy exhibit preferential elimination of bpy, indicating that bpy is a weaker ligand than phen and dap.
authors.affiliation: Chemisches Institut, Universität Potsdam (Golm), Karl-Liebknechtstr. 24-25, 14476 Golm, Germany.
authors.forename: Ines
authors.initials: I
authors.lastname: Starke
authors.forename: Stefan
authors.initials: S
authors.lastname: Kammer
authors.forename: Nicolas
authors.initials: N
authors.lastname: Grunwald
authors.forename: Uwe
authors.initials: U
authors.lastname: Schilde
authors.forename: Hans-Jürgen
authors.initials: HJ
authors.lastname: Holdt
authors.forename: Erich
authors.initials: E
authors.lastname: Kleinpeter