Crystalline C60 fulleride with metal inside
Abstract
Endohedral metallofullerenes have been extensively studied, since the first experimental observation of La@C60 in a laser-vaporized supersonic beam in 1985. However, all of these studies have been carried out on metallofullerenes larger than C60 such as (metal)@C82, and there are no reported purified C60-based metallofullerenes except for [Li@C60]+(SbCl6)- salt. Pure (metal)@C60 has not been obtained because of their extremely high chemical reactivity. We report here the first isolation, structural determination and electromagnetic properties of crystalline C60-based metallofullerenes, Gd@C60(CF3)5 and La@C60(CF3)5. Synchrotron X-ray single-crystal diffraction reveals that La and Gd atoms are indeed encapsulated in the Ih-C60 fullerene. The HOMO-LUMO gaps of Gd@C60 and La@C60 are significantly widened by an order of magnitude with addition of CF3- groups. Magnetic measurements show the presense of a weak antiferromagnetic coupling in Gd@C60(CF3)3 crystals at low temperatures. Gd@C60 and La@C60 might exhibit superconductivity as the electronic structures resemble those of superconducting alkali-doped C60 fullerides.
Cite
@article{arxiv.1801.10258,
title = {Crystalline C60 fulleride with metal inside},
author = {Ayano Nakagawa and Makiko Nishino and Hiroyuki Niwa and Katsuma Ishino and Zhiyong Wang and Haruka Omachi and Ko Furukawa and Takahisa Yamaguchi and Tatsuhisa Kato and Shunji Bandow and Jeremy Rio and Chris Ewels and Shinobu Aoyagi and Hisanori Shinohara},
journal= {arXiv preprint arXiv:1801.10258},
year = {2018}
}
Comments
15 pages, 4 figures