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首页> 外文期刊>Journal of mass spectrometry: JMS >Mass spectrometric study of the ionized C-60: (gamma-Cyclodextrin)(2) inclusion complex by collision induced dissociation
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Mass spectrometric study of the ionized C-60: (gamma-Cyclodextrin)(2) inclusion complex by collision induced dissociation

机译：碰撞诱导解离对电离的C-60：（γ-环糊精）（2）包合物的质谱研究

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摘要

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-clodextrin)(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 cycloclextrin ions as well as their fragments. In negative ion mode the closed shell anion C60H- 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 C60H- 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+) < [C60:(gamma-cyclodextrin)(2)- 2H](2-) < [C60:(gamma-cyclodextrin)(2)+ 2Na](2+).
机译：水溶性包合物[C-60：（γ-环糊精）（2）]已使用电喷雾串联质谱和碰撞诱导解离进行了表征。在气相中检测到[C-60：（γ-clodextrin）（2）]离子为双去质子，双质子化和双磺化离子。电雾化后不存在单电荷配位离子可能是包合物的二聚体性质和结构对称性的结果。碰撞引起的正离子解离仅导致对质子化和盐化的环糊精离子及其碎片的观察。在负离子模式下，闭壳阴离子C60H-是在低碰撞能量下检测到的主要片段，而在较高碰撞能量下，与去质子化的环糊精单元相对应的信号变得很重要。由于据报道与C-60和C-60（-）相比，C-60（2-）具有不可忽略的碱度，因此与C-60H-阴离子形成有关的质子转移很可能发生在C-60H-阴离子的转移之后。从去质子化的γ-环糊精到富勒烯的两个电子。最后，还显示了包合物离子的电荷状态会影响其亚基之间的相互作用强度。在电喷雾后，在气相中研究的三种离子的相对稳定性如下：[C-60：（γ-环糊精）（2）+ 2H]（2+）<[C60：（γ-环糊精）（2） -2H]（2-）<[C60：（γ-环糊精）（2）+ 2Na]（2+）。

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