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Stevenson S, Rothgeb AJ, Tepper KR, Duchamp J, Dorn HC, Powers XB, Roy M, Olmstead MM, Balch AL. Isolation and Crystallographic Characterization of Two, Nonisolated Pentagon Endohedral Fullerenes: Ho 3 N@C 2 (22010)-C 78 and Tb 3 N@C 2 (22010)-C 78. Chemistry 2019; 25:12545-12551. [PMID: 31268197 DOI: 10.1002/chem.201902559] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 06/29/2019] [Indexed: 11/11/2022]
Abstract
Purified samples of Ho3 N@C2 (22010)-C78 and Tb3 N@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 Ho2 O3 or Tb4 O7 . 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 Ho3 N or Tb3 N unit is planar. Ho3 N@C2 (22010)-C78 and Tb3 N@C2 (22010)-C78 use the same cage previously found for Gd3 N@C2 (22010)-C78 rather than the IPR-obeying cage found in Sc3 N@D3h -C78 .
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Affiliation(s)
- Steven Stevenson
- Department of Chemistry, Purdue University Fort Wayne, 2101 E. Coliseum Blvd, Fort Wayne, IN, 46805, USA
| | - Amanda J Rothgeb
- Department of Chemistry, Purdue University Fort Wayne, 2101 E. Coliseum Blvd, Fort Wayne, IN, 46805, USA
| | - Katelyn R Tepper
- Department of Chemistry, Purdue University Fort Wayne, 2101 E. Coliseum Blvd, Fort Wayne, IN, 46805, USA
| | - James Duchamp
- Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, 24061, USA
| | - Harry C Dorn
- Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, 24061, USA
| | - Xian B Powers
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA
| | - Mrittika Roy
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA
| | - Marilyn M Olmstead
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA
| | - Alan L Balch
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA
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