富勒醇的直接激光解吸飞行时间质谱分析

采用激光解吸电离飞行时间质谱对富勒醇样品进行研究,并与富勒烯标准品的质谱特征比较,以正负离子模式联合检测方法考察其特征结构。结果显示,正离子模式下,富勒醇碳笼易为规律性的碎裂峰,负离子模式下,则保留碳笼主体结构的特征峰,而富勒烯的碳笼结构在两种模式下不发生变化。表明该方法可以方便、快速地鉴别富勒醇的结构。采用该方法对富勒醇在二甲基亚砜(DMSO)中的稳定性进行分析,结果发现富勒醇可稳定存在于DMSO溶剂中,用于碱式反应条件下合成富勒醇的鉴别与条件筛选,选择反应碱的最佳浓度为1.0 g/mL。

Analysis of Fullerenols by Direct Laser Desorption Time-of-Flight Mass Spectrometry

The structure of fullerenols was directly characterized by combining detection of positive and negative ion mode of laser desorption ionization time-of-flight mass spectrometry.Compared to that of the fullerene,the carbon cage of fullerenol was found to more easily show regular fragmentation peaks in the positive ion mode.However,in the negative ion mode,both fullerene and fullerenol retain the characteristic peaks of carbon cage.This method can be used for the identification and selection of the alkali reaction condition for the synthesis of fullerenols,and the optimal reaction alkali concentration of 1.0 g/mL was obtained.At the same time,this method was also approved that fullereols could be stable in the solvent of DMSO.