期刊
JOURNAL OF MASS SPECTROMETRY
卷 47, 期 1, 页码 34-40出版社
WILEY
DOI: 10.1002/jms.2023
关键词
ESI MS; tandem mass spectrometry; relative binding strength; iridium(III) complexes
资金
- Dutch Polymer Institute (DPI) [667]
- Thuringer Ministerium fur Bildung, Wissenschaft und Kultur [B715-07011, B515-07008]
An electrospray ionization quadrupole time-of-flight mass spectrometer has been utilized to investigate the relative ligand-binding strengths in a series of heteroleptic-charged iridium(III) complexes of the general formula [(C boolean AND N)2IrIII(S-tpy)](PF6) by using variable collision energies. Collision-induced dissociation experiments were performed in order to study the stability of the IrIII complexes that are, for instance, suitable phosphors in light-emitting electrochemical cells. The ratio of signal intensities belonging to the fragment and the undissociated complex depends on the collision energy applied for the tandem mass spectra (MS/MS) analysis. By defining the threshold collision energy and the point of complete complex dissociation, it is possible to estimate the relative complex stabilities depending on the nature of the coordinated ligands [i.e. type of cyclometalating ligand (C boolean AND N), substituents on the S-shaped terpyridine (S-tpy)]. The collision energy values differed as a function of the coordination sphere of the IrIII centers. Copyright (C) 2011 John Wiley & Sons, Ltd.
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