GAS-PHASE ION CHROMATOGRAPHY - TRANSITION-METAL STATE SELECTION AND CARBON CLUSTER FORMATION
GAS-PHASE ION CHROMATOGRAPHY - TRANSITION-METAL STATE SELECTION AND CARBON CLUSTER FORMATION
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DOI：
10.1126/science.260.5113.1446
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发表时间：
1993-06-04
期刊：
影响因子：
56.9
通讯作者：
VANKOPPEN, PAM
中科院分区：
文献类型：
--
作者：
BOWERS, MT;KEMPER, PR;VANKOPPEN, PAM
气相离子色谱可以分离质量相同但同分异构体或电子构型不同的离子。简要介绍了该技术的主要特点，并介绍了该技术在过渡金属化学和碳团簇化学中的一系列应用。过渡金属化学的例子包括状态选择性反应、激发态失活和状态选择性配体结合能。对于团簇，使用离子色谱来确定从C4到C84的纯碳团簇离子的结构作为大小的函数。结果表明，碳首先在直链中生长，在C-10左右转变为单环平面环，在C20、C30和C40分别形成新的平面双环、三环和四环。富勒烯神秘地出现在C30上，并以C50为主，它是通过加热位于异构化势垒上方的平面环系而不是通过石墨前体的生长而产生的。
Gas-phase ion chromatography can separate ions that have the same mass but differ in isomeric structure or electronic configuration. The main features of this technique are briefly outlined, and applications to a series of problems in transition metal chemistry and carbon cluster chemistry are described. Examples in transition metal chemistry include state-selective reactivity, excited state deactivation, and state-selective ligand binding energies. For clusters, ion chromatography was used to determine the structure of pure carbon cluster ions as a function of size from C4 to C84. The results indicate that carbon grows first in linear chains, transforms to monocyclic planar rings at about C-10, and forms new families of planar bi-, tri-, and tetracyclic rings at C20, C30, and C40, respectively. Fullerenes, which mysteriously appear at C30 and dominate by C50, are generated by heating the planar ring systems above an isomerization barrier rather than by growth of graphite precursors.