title: Electrospray ionization mass spectrometry studies of rhenium(I) bipyridyl complexes.
abstract: Electrospray ionization mass spectrometry (ESMS) has been employed to study the formation of fragment ions of a series of rhenium(I) bipyridyl complexes [(4,4'-di-(COOEt)2-bpy) Re(CO)3XPyPF6], where bpy is 2,2'-bipyridine, Py is pyridine, and X is H, 4-methyl, 3-methyl, 4-hydroxyl, 3-hydroxyl, 4-amino, or 3-amino of the pyridine ligand. The effects of substituents (X) on the stabilities of the complexes have been investigated with the increase of fragmentor voltages. For different X, the stabilities of the complexes increase as X become more electron-donating from H to CH3, OH, and NH2. For the same substituent, the p-substituted pyridines have stronger stabilizing effect than the corresponding m-substituted ones. Ligand exchange reaction was found in acetonitrile, where the pyridine ligand has been replaced by the solvent indicated by the formation of [M-PF6- XPy+MeCN]+ in the fragmentation.
authors.affiliation: State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China.
authors.forename: Rong
authors.initials: R
authors.lastname: Zhang
authors.forename: Shiguo
authors.initials: S
authors.lastname: Sun
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Peng
authors.forename: Licheng
authors.initials: L
authors.lastname: Sun
mesh_terms: D015082:2,2'-Dipyridyl / Q000737:chemistry*; D009942:Organometallic Compounds / Q000032:analysis*; D012211:Rhenium / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D009942:Organometallic Compounds; D015082:2,2'-Dipyridyl; D012211:Rhenium