First observation of carbon aggregate ions >C600+ by laser desorption Fourier transform mass spectrometry
First observation of carbon aggregate ions >C600+ by laser desorption Fourier transform mass spectrometry
复制标题
通过激光解吸傅立叶变换质谱首次观察碳聚集离子 >C600
DOI：
10.1021/j100341a005
复制
发表时间：
1989
期刊：
影响因子：
--
通讯作者：
C. Wilkins
中科院分区：
文献类型：
--
作者：
H. So;C. Wilkins
本文报道了沉积在不锈钢探针和氯化钾涂层不锈钢探针上的苯烟灰样品的脉冲二氧化碳激光解吸傅里叶变换质谱（LD/FTMS）。在这两种条件下，多环芳烃离子与mjz低于1000和一系列偶数碳聚集体正离子延伸到mjz 7200以上。发现沉积在不锈钢上的烟灰中C60+的相对丰度增加，但在KCl涂覆的不锈钢上没有。在高于m/z 1000的高质量区域中，似乎可以检测到两种不同分布的碳聚集体正离子。一个分布似乎以C154+为中心，第二个分布范围更广，从大约1000到大约1000。C300+至高于C600+。通过激光烧蚀工艺从石墨形成仅含碳的中性和离子聚集体，1 '10 * 激发了关于这些物质结构的大量对话。由于没有直接的结构信息，各种结构的建议，包括球形3和线性交联聚合物物种10是合理的质谱离子丰度测量方面。一种特殊的聚集体，C60+，和它的金属连接衍生物一直是许多讨论的主题，主要是因为Smalley的im，
Pulsed carbon dioxide laser desorption Fourier transform mass spectra (LD/FTMS) of benzene soot samples, deposited upon a stainless steel probe tip and a potassium chloride coated stainless steel probe tip, are reported. Under both conditions, polyaromatic hydrocarbon ions with mjz below 1000 and a series of even-numbered carbon aggregate positive ions extending above mjz 7200 are observed. Enhanced relative abundance of C60+ is found for soot deposited upon stainless steel, but not on KCl-coated stainless steel. In the high mass region above m/z 1000, it appears that two distinct distributions of carbon aggregate positive ions can be detected. One distribution appears to be centered around C154+ and a second, much broader, distribution extends from ca. C300+ to above C600+.Formation of neutral and ionic aggregates exclusively containing carbon, via laser ablation processes from graphite, 1'10* has inspired a good deal of dialogue regarding the structures of these species. Because no direct structural information is available, various structural proposals including both spherical3 andlinear cross-linked polymeric species10 are rationalized in terms of mass spectrometric ion abundance measurements. One particular aggregate, C60+, and its metal-attached derivatives have been the subject of much discussion, primarily because of Smalley’s im-