Intracluster Polymerization Reactions withinAcetylene and Methylacetylene Clusters Ions
STATE UNIV OF NEW YORK AT BUFFALO DEPT OF CHEMISTRY
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We report the observation of large n up to -25 acetylene and methylacetylene cluster ions - the largest yet reported from ionization of neutral C2H2n or CH3CCHn clusters. The cluster ion intensity distributions of both systems display prominent magic numbers at n 3. This finding is indicative of intraclusters ion-molecule reactions giving rise to what are most likely benzene and trimethylbenzene ions from C2H2n and CH3CCHn cluster ions, respectively. The n acetylene cluster ion intensity distributions observed under efficient clustering conditions are further characterized by unexpected features, most notably a sharp break at n 7 and a strong magic number at n 14. The mass spectra of methyl-acetylene display a less dramatic break at n 7 and a weak magic number around n 10. These surprising structures may arise as a result of the formation of particularly stable covalently bonded molecules ions. In view of the unique properties of carbon it is possible that these ions possess spherical cage geometries reminiscent of the fullerenes.
- Organic Chemistry
- Physical Chemistry
- Polymer Chemistry
- Atomic and Molecular Physics and Spectroscopy