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Rong Zhang,a Shiguo
Sun,a Xiaojun Peng,a,* Licheng Suna,b,*
,aState Key Laboratory of Fine Chemicals, Dalian University of Technology,
Dalian 116012, China. E-mail: pengxj@dlut.edu.cn
bDepartment of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 106 91 Stockholm,
Sweden |
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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 substitutent, 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acetonitrile, where the pyridine ligand has been replaced by the solvent indicated by the formation of [M-PF6-XPy+MeCN]+ in the fragmentation |
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Keywords:
Electrospray ionization mass spectrometry (ESMS), rhenium(I) bipyridyl complexes, in-source CID, ligand exchange, electron-donating group, solar cell |
