Article (Scientific journals)
Mass Spectrometric Study of the Ionized C60: (Gamma-Cyclodextrin)2 Inclusion Complex by Collision Induced Dissociation
Greisch, Jean-François; Kyritsoglou, S.; Leyh, Bernard et al.
2008In Journal of Mass Spectrometry, 43 (2), p. 242-50
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Keywords :
Internal energy; Spectrométrie de masse
Abstract :
[en] The water soluble inclusion complex [C(60):(gamma-cyclodextrin)(2)] has been characterized using electrospray tandem mass spectrometry and collision induced dissociation. [C(60):(gamma-cyclodextrin)(2)] ions were detected in the gas phase as doubly deprotonated, doubly protonated and doubly sodiated ions. The absence of monocharged complex ions following electronebulization is a likely consequence of the dimeric nature and structural symmetry of the inclusion complex. The collision induced dissociation of positive ions led exclusively to the observation of the protonated and sodiated cyclodextrin ions as well as their fragments. In negative ion mode the closed shell anion C(60)H(-) was the dominant fragment detected at low collision energies whereas at higher collision energies the signal corresponding to deprotonated cyclodextrin units becomes significant. Since C(60) (2-) has been reported to have a nonnegligible basicity compared to C(60) and C(60) (-), it is likely that the proton transfer involved in the formation of the C(60)H(-) anion occurs following transfer of the two electrons from the deprotonated gamma-cyclodextrins to the fullerene. Finally, the charge state of the inclusion complex ions is also shown to affect the interaction strengths between its subunits. The relative stabilities of the three ionic species studied in gas phase following electronebulization are as follows: [C(60):(gamma-cyclodextrin)(2) + 2H](2+) < [C(60):(gamma-cyclodextrin)(2)- 2H](2-) < [C(60):(gamma-cyclodextrin)(2) + 2Na](2+).
Research center :
Laboratoire de spectrométrie de masse
Giga-Systems Biology and Chemical Biology - ULiège
Disciplines :
Chemistry
Author, co-author :
Greisch, Jean-François ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie physique
Kyritsoglou, S.
Leyh, Bernard  ;  Université de Liège - ULiège > Département de chimie (sciences) > Laboratoire de dynamique moléculaire
De Pauw, Edwin  ;  Université de Liège - ULiège > Chimie physique, spectrométrie de masse
Language :
English
Title :
Mass Spectrometric Study of the Ionized C60: (Gamma-Cyclodextrin)2 Inclusion Complex by Collision Induced Dissociation
Publication date :
February 2008
Journal title :
Journal of Mass Spectrometry
ISSN :
1076-5174
eISSN :
1096-9888
Publisher :
Wiley, Chichester, United Kingdom
Volume :
43
Issue :
2
Pages :
242-50
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
NOMADE
Funders :
Région wallonne [BE]
Available on ORBi :
since 22 May 2009

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