화학공학소재연구정보센터
Inorganic Chemistry, Vol.56, No.4, 1974-1980, 2017
Sc2C2@D-3h(14246)-C-74: A Missing Piece of the Clusterfullerene Puzzle
Clusterfullerenes with variable carbon cages have been extensively studied in recent years. However, despite all these efforts, C-74 cage-based clusterfullerene remains a missing piece of the puzzle. Herein, we show that single-crystal X-ray crystallographic analysis unambiguously assigns the previously reported dimetallofullerene Sc-2@C-76 to a novel carbide clusterfullerene, Sc2C2@D(3)h(14246)-C-74, the first experimentally proven clusterfullerene with a C74 cage. In addition, Sc2C2@ D-3h(14246)-C-74 was charaterized by mass spectrometry, ultraviolet visible nearinfrared absorption spectroscopy, 45Sc nuclear magnetic resonance, and cyclic voltammetry. Comparative studies of the motion of the carbide cluster in Sc2C2@ D-3h(14246)-C-74 and Sc2C2@C-2 (n = 40-44) revealed that a combination of factors, involving both the shape and size of the cage, is crucial in dictating the cluster motion. Moreover, structural studies of D-3h(14246)-C-74 revealed that it can be easily converted to C-5(10528)-C-72 and T-d(19151)-C-76 cages via C2 desertion/insertion and Stone Wales transformation. This suggests that D-3h(14246)-C-74 might play an important role in the growth pathway of clusterfullerenes.