Gas-Phase Ion Chromatography: Transition Metal State Selection and Carbon Cluster Formation

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 descr...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1993-06, Vol.260 (5113), p.1446-1451
Main Authors: Bowers, Michael T., Kemper, Paul R., von Helden, Gert, Petra A. M. van Koppen
Format: Article
Language:English
Subjects:
Analytical chemistry
Binding energy
Carbon
Chemistry
Chromatographic methods and physical methods associated with chromatography
Chromatography
Exact sciences and technology
Fullerenes
Gas chromatographic methods
Gas chromatography
Ground state
Instrumentation
Ion chemistry
Ions
Isomers
Methods
Reactivity
Transition metals
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Summary: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 C$_4$ to C$_{84}$. 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 C$_{20}$, C$_{30}$, and C$_{40}$, respectively. Fullerenes, which mysteriously appear at C$_{30}$ and dominate by C$_{50}$, are generated by heating the planar ring systems above an isomerization barrier rather than by growth of graphite precursors.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.260.5113.1446