Collisional probes and possible structures of La2C80

✍ Scribed by Chahan Yeretzian; Klavs Hansen; Marcos M. Alvarez; K.S. Min; E.G. Gillan; Károly Holczer; Richard B. Kaner; Robert L. Whetten

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 388 KB
• Volume: 196
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(92)85978-j

✦ Synopsis

The soluble molecule La2C8o recently reported by Alvarez et al. exhibits a robustness similar to other fullerenes. It survives intact for ~ 10 -6 s following impact against solid surfaces Si(100) at up to 200 eV, yielding an estimate Er> 4 eV for fragmentation processes. The high threshold for electron emission suggests that the electron affinity in La2C~b is significantly larger than in C6o. These facts seem to rule out an external site for either La atom and disfavor a network-site interpretation, and thus favor endohedral (encapsulation) sites. Among the possible cages, the lh-Cso fullerene appears to be highly favorable for the oxidation state (La 3+ )2C6ff.