An Efficient Ionization Method of Electrospray Mass Spectrometry: The Development of an Aromatic-Cored Matrix That Wraps Labile Metal Complexes through Molecular Recognition
✍ Scribed by Kazuhisa Kumazawa; Michito Yoshizawa; Hong-Bo Liu; Yuko Kamikawa; Masaya Moriyama; Takashi Kato; Makoto Fujita
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 162 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0947-6539
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Compound 1 a, which possesses a triphenylene core and six tetraethyleneoxide side chains, shows efficient ionization of M^II^‐containing (M=Pd, Pt) complexes in electrospray ionization mass spectrometry (ESI‐MS). The molecular ion peaks [M]^+^, which are hardly detected under common ESI‐MS conditions, are clearly observed as their [M⋅(1 a)~n~]^+^ (n=1–4) adducts. UV‐visible and NMR studies reveal that the electron‐rich triphenylene core of 1 a binds to the electron‐deficient frameworks of the M^II^ complexes in solution, giving rise to charge transfer (CT) complexes. We suggest that 1 a stabilizes the complexes and promotes efficient ionization through unique donor–acceptor molecular recognition.