Unprecedented mu4-C2(6-) anion in Sc4C2@C80

Area of Science:

• Computational Chemistry
• Materials Science
• Inorganic Chemistry

Background:

• Metal carbide compounds with highly charged diatomic carbon (C2) moieties are rare.
• The existence and properties of such species are crucial for understanding bonding and reactivity in novel materials.

Purpose of the Study:

• To investigate the theoretical possibility of a highly charged C2(6-) anion within a metal cluster.
• To explore the stability and characteristics of the endofullerene Sc4C2@C80 containing this unique moiety.
• To provide predictive data for experimental validation.

Main Methods:

• Density functional calculations were employed to model the electronic structure and properties of the endofullerene.
• Key properties such as ionization energy, electron affinity, NMR chemical shifts, vibrational frequencies, and redox potentials were computed.

Main Results:

• The study confirms the viability of an unprecedented mu4-C2(6-) anion encapsulated within a [Sc4C2]6+ cluster.
• This unique cluster forms a stable endofullerene, Sc4C2@C80.
• Predicted electronic structure, spectroscopic (13C NMR, vibrational), and electrochemical properties are reported.

Conclusions:

• The theoretical prediction of the mu4-C2(6-) anion in Sc4C2@C80 represents a significant advancement in the field of metal carbides.
• The calculated properties serve as a guide for future experimental synthesis and characterization of this novel endofullerene.