Characterization of self-assembled supramolecular [Ga4L6] host-guest complexes by electrospray ionization mass spectrometry
Journal of the American Society for Mass Spectrometry(2006)
摘要
Self-assembled supramolecular host-guest complexes have been characterized by electrospray ionization mass spectrometry. The
spectra obtained by use of a Q-TOF instrument equipped with a Z-spray ion source show primarily the 3- and 4- charge states
of the assemblies. The assemblies have the general formula [guest ⊂ Ga4
L
6]11− where L represents the chelating bidentate catechol ligand 1,5-bis(2′,3′-dihydroxy-benzamido)naphthalene and guests are tetramethyl
ammonium (Me4N+), tetraethyl ammonium (Et4N+), tetra-n-propyl ammonium (Pr4N+) and decamethylcobaltocenium (Cp*2Co+) cations. For the first time, the mass spectrum of the empty assembly [Ga4
L
6]12− is reported. This article also reports that provided the electrospray ion source is capable of preserving noncovalent interactions,
it is possible to observe host-guest complexes containing both weak binding guests as well as sterically demanding guests
in the mass spectra. The present data suggest that electrospray mass spectrometry is a powerful tool for characterization
of supramolecular host-guest complexes.
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关键词
electrospray ionization mass spectrometry,mass spectra,mass spectrometry,spectrum
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