Electrospray ionization mass spectrometry studies of rhenium(I) bipyridyl complexes

• Electrospray ionization mass spectrometry has been employed to study the formation of fragment ions from a series of rhenium(I) bipyridyl complexes [(4,4'-di-(COOEt)(2)-bpy) Re(CO)(3)XPyPF6], 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 stability of the complexes has been investigated with the increase of fragmentor voltages. For different X substitutents, the stability of the complexes increases as X becomes more electron-donating from H to CH3, OH and NH2. For the same substitutent, the p-substituted pyridines have a 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 Ligand exchange reaction was found in acetonitrile, where the pyridine ligand has been replaced by the solvent, indicated by the formation of [M - PF6 - XPy + MeCN](+) in the fragmentation.

Nyckelord

electrospray ionization mass spectrometry (ESI-MS)

rhenium(I) bipyridyl complexes

in-source CID

ligand exchange

electrondonating group

solar cell

tio2

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