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On the Structural and Vibrational Properties of Solid Endohedral Metallofullerene Li@C 60.

Authors :
Vrankić, Martina
Nakagawa, Takeshi
Menelaou, Melita
Takabayashi, Yasuhiro
Yoshikane, Naoya
Matsui, Keisuke
Kokubo, Ken
Kato, Kenichi
Kawaguchi-Imada, Saori
Kadobayashi, Hirokazu
Arvanitidis, John
Kubota, Yoshiki
Prassides, Kosmas
Source :
Inorganics. Apr2024, Vol. 12 Issue 4, p99. 13p.
Publication Year :
2024

Abstract

The endohedral lithium fulleride, Li+@C60•−, is a potential precursor for new families of molecular superconducting and electronic materials beyond those accessible to date from C60 itself. Solid Li@C60 comprises (Li@C60)2 dimers, isostructural and isoelectronic with the (C59N)2 units found in solid azafullerene. Here, we investigate the structural and vibrational properties of Li@C60 samples synthesized by electrolytic reduction routes. The resulting materials are of high quality, with crystallinity far superior to that of their antecedents isolated by chemical reduction. They permit facile, unambiguous identification of both the reduced state of the fulleride units and the interball C-C bonds responsible for dimerization. However, severe orientational disorder conceals any crystal symmetry lowering due to the presence of dimers. Diffraction reveals the adoption of a hexagonal crystal structure (space group P63/mmc) at both low temperatures and high pressures, typically associated with close-packing of spherical monomer units. Such a situation is reminiscent of the structural behavior of the high-pressure Phase I of solid dihydrogen, H2. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
23046740
Volume :
12
Issue :
4
Database :
Academic Search Index
Journal :
Inorganics
Publication Type :
Academic Journal
Accession number :
176874751
Full Text :
https://doi.org/10.3390/inorganics12040099