Fourier transform ion cyclotron resonance studies of terpyridine based polyether dendrimers and their iron(II) metallocomplexes by liquid secondary ion mass spectrometry

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Eur. J. Mass Spectrom. 1, 371 - 380 (1995)

Fourier transform ion cyclotron resonance studies of terpyridine based polyether dendrimers and their iron(II) metallocomplexes by liquid secondary ion mass spectrometry

Rebecca L.C. Lau, T-W. Dominic Chan,^* Ida Y.-K. Chan and Hak-Fun Chow
Department of Chemistry, The Chinese University of Hong Kong, Shatin, NT, Hong Kong.

ABSTRACT:

A detailed analysis is presented of the fragmentation patterns of a series of terpyridine-based polyether dendritic ligands (L) and their corresponding iron(II) complexes [Fe(L)₂][PF₆]₂ recorded under typical liquid secondary ion mass spectrometry (L- SIMS) conditions. Fragmentation behaviour of these compounds is characterised and is well-correlated to their structural features. In addition to the unexpected reduction phenomenon of the iron(II) metal centre, there also exists a high-order of multiple charging for both the free dendritic ligands and the corresponding metallodendrimers. Molecule ions with up to ten charges have been observed for metallodendrimers. From the comparison of mass spectral features of the free dendritic ligands and the corresponding metallodendrimers, it is concluded that the observed high- order of multiple charging originates from the multiple loss of electrons from the terpyridine core of the molecules.

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