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Isolation and Crystallographic Characterization of Two,Nonisolated Pentagon Endohedral Fullerenes: Ho3N@C2(22010)-C78 and Tb3N@C2(22010)-C78 |
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| Authors: | Prof?Dr Steven Stevenson Amanda J Rothgeb Katelyn R Tepper Prof?Dr James Duchamp Prof?Dr Harry C Dorn Xian B Powers Mrittika Roy Prof?Dr Marilyn M Olmstead Prof?Dr Alan L Balch |
| Institution: | 1. Department of Chemistry, Purdue University Fort Wayne, 2101 E. Coliseum Blvd, Fort Wayne, IN, 46805 USA;2. Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, 24061 USA;3. Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, 95616 USA |
| Abstract: | Purified samples of Ho3N@C2(22010)-C78 and Tb3N@C2(22010)-C78 have been isolated by two distinct processes from the rich array of fullerenes and endohedral fullerenes present in carbon soot from graphite rods doped with Ho2O3 or Tb4O7. Crystallographic analysis of the endohedral fullerenes as cocrystals with Ni(OEP) (in which OEP is the dianion of octaethylporphyrin) shows that both molecules contain the chiral C2(22010)-C78 cage. This cage does not obey the isolated pentagon rule (IPR) but has two sites where two pentagons share a common C?C bond. These pentalene units bind two of the metal ions, whereas the third metal resides near a hexagon of the cage. Inside the cages, the Ho3N or Tb3N unit is planar. Ho3N@C2(22010)-C78 and Tb3N@C2(22010)-C78 use the same cage previously found for Gd3N@C2(22010)-C78 rather than the IPR-obeying cage found in Sc3N@D3h-C78. |
| Keywords: | crystallography fullerenes holmium supramolecular chemistry terbium |