T. John et al., PRODUCTION, ISOLATION, AND CHARACTERIZATION OF GROUP-2 METAL-CONTAINING ENDOHEDRAL METALLOFULLERENES, Applied physics A: Materials science & processing, 66(3), 1998, pp. 243-247
Structural and electronic properties of group-2 metal-containing endoh
edral metallofullerenes (Ca/Sr/ Ba@C-80, Ca/Sr/Ba@C-82, Ca/Sr/Ba@C-84)
are investigated for the first time by UV-Vis-NIR absorption spectros
copy and high-resolution C-13 NMR. Direct evidence of the endohedral n
ature and cage structures are revealed by these measurements. Furtherm
ore, we have found that each metallofullerene has 2-4 structural isome
rs, which have been isolated by multistage high-performance liquid chr
omatography. These isomers have different cage structures and give cha
racteristic UV-Vis-NIR absorption spectra.