Selective Synthesis, Isolation, and Crystallographic Characterization of LaSc2N@Ih-C80

Document Type

Article

Publication Date

12-17-2012

Department

Chemistry and Biochemistry

School

Mathematics and Natural Sciences

Abstract

The successful preparation and isolation of the mixed-metal endohedral fullerene, LaSc2N@Ih-C80, and its structural characterization by single-crystal X-ray diffraction are reported. Results from chemically adjusting plasma temperature, energy, and reactivity (CAPTEAR) experiments indicate that a 10 wt % addition of Cu(NO3)2·2.5H2O to a mixture of La2O3 and Sc2O3 decreases the amount of C60 and C70 found in soot extracts by an order of magnitude. By combining a stoichiometric 2-fold excess of La to Sc atoms in the plasma reactor, an extract containing a greater abundance of LaSc2N@Ih-C80 relative to Sc3N@Ih-C80 was obtained. Alternatively, the stir and filter approach (SAFA method) can be used to remove the empty cage fullerenes from a carbon soot sample prepared without using Cu(NO3)2·2.5H2O. LaSc2N@Ih-C80 has been characterized by UV/vis absorption spectroscopy and by single-crystal X-ray diffraction. Ordered crystals with nearly identical orientations of the endohedral relative to the porphyrin have been obtained by cocrystallization of LaSc2N@Ih-C80 with either NiII(OEP) or H2(OEP). The LaSc2N unit is planar, although earlier computations suggested that it would be pyramidal.

Publication Title

Inorganic Chemistry

Volume

51

Issue

24

First Page

13096

Last Page

81

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