Beilstein J. Org. Chem.2014,10, 714–721, doi:10.3762/bjoc.10.65
in situ from the sultine 4,5-benzo-3,6-dihydro-1,2-oxathiin 2-oxide and its derivative, to La metal-encapsulated fullerenes, La2@C80 or La@C82, afforded the novel derivatives of endohedral metallofullerenes (3a,b, 4a,b and 5b). Molecular structures of the resulting compounds were elucidated using
spectroscopic methods such as MALDI–TOF mass, optical absorption, and NMR spectroscopy. The [4 + 2] adducts of La2@C80 (3a,b, and 4a,b) and La@C82 (5b), respectively, retain diamagnetic and paramagnetic properties, as confirmed by EPR spectroscopy. Dynamic NMR measurements of 4a at various temperatures
metallofullerene derivatives for the use in material science.
Keywords: carbon nanomaterials; dynamic NMR; endofullerenes; La2@C80; La@C82; sultine; Introduction
Endohedral metallofullerenes (EMFs) are a family of nanocarbons, which encapsulated one or more metal atoms inside a hollow carbon cage [1][2][3][4
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Graphical Abstract
Scheme 1:
Synthesis of [4 + 2] adducts of La2@C80.