激光烧蚀C_(60)衍生物产生奇数碳笼团簇

Formation of Odd-Numbered Carbon Cage-Like Clusters by Laser Ablation of Fullerene Derivatives

利用激光烧蚀飞行时间质谱技术研究了Ｃ_(６０)衍生物Ｃ_(６０)ＣＨ_２，Ｃ_(６０)Ｒ_２和Ｃ_(６０)ＨＲ（Ｒ＝Ｃ_６Ｈ_５ＣＯ－）的富勒烯团簇动力学，在负离子通道，对 Ｃ_(６０)ＣＨ_２及 Ｃ_(６０)Ｒ_２可清楚地观测到 Ｃ_(５５)－，Ｃ_(５７)－等碳笼团簇离子，而对 Ｃ_(６０)ＨＲ虽然其正离子谱与Ｃ_(６０)ＣＨ_２和Ｃ_(６０)Ｒ_２相似，却观测不到奇数碳笼团簇的产生．初步讨论了奇数碳笼团簇的产生及其与衍生物结构的关系．

Three C_(60) derivatives C_(60)CH_2, C_(60)R_2 and C_(60)HR(R=C_6H_5CO-) are studied by laser ablation time-of flight mass spectrometric technique. In the negative ion mass spectra of C_(60)CH_2 and C_(60)R_2,odd-numbered clusters C_(57)^-, C_(55)^- can clearly be observed in addition to the even-numbered fullerene fragment ions. For the monoadduct C60HR, no odd-numbered specy is detected even though its positive ion mass spectrum is similar to those of C_(60)CH_2 and C_(60)R_2. The formation mechanism of odd-numbered carbon cage-like clusters and its relationship to the structure of the fullerene derivative are discussed.