Tuesday, 30 May 2017: 08:00
Churchill A2 (Hilton New Orleans Riverside)
Carbon cages that entrap metals were first observed just days after the landmark discovery of C60. The synthesis of Sc3N@C80, which is comprised of a planar Sc3N cluster encapsulated within an icosahedral C80 cage, transformed significantly the field of endohedral metallofullerenes (EMFs). Recently, efficient routes toward arc discharge plasma synthesis of EMFs by vaporization of graphite, metal oxide, and solid nitrogen sources, such as guanidine thocyanate and guanidinium salts, have been developed. However, the origin of EMFs produced by plasma synthesis techniques and any associated formation processes that take place remains still unclear. Here, we report some recent results on the gas-phase synthesis of Sc3N@C2n and particularly on the transformation of the pentalene-containing Sc3N@D3-C68 compound, which transform through a bottom-up mechanism into Sc3N@C80. We will discuss on potential pathways for the growth of Sc3N@D3-C68 when it is exposed to an atmosphere of carbon plasma produced from graphite, and on the potential role that heptagonal rings may play.