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A large family of dysprosium-based trimetallic nitride endohedral fullerenes: [email protected] (39 </= n </= 44).

Authors
Type
Published Article
Journal
The Journal of Physical Chemistry B
1520-5207
Publisher
American Chemical Society
Publication Date
Volume
109
Issue
25
Pages
12320–12328
Identifiers
PMID: 16852521
Source
Medline

Abstract

Dysprosium-based trimetallic nitride endohedral fullerenes (clusterfullerenes)-the Dy(3)[email protected](2)(n) (38 </= n </= 49) family-have been produced at overwhelming yields compared to the empty fullerenes for the first time. The Dy(3)[email protected](2)(n) family represents the largest clusterfullerene family explored up to now, even in comparison with the Tm(3)[email protected](2)(n) (38 </= n </= 44) family which was discovered very recently. A series of 10 Dy(3)[email protected](2)(n) clusterfullerenes (39 </= n </= 44, 1-9) have been isolated successfully and characterized by HPLC, mass spectrometry, and UV-vis-NIR spectroscopy. The study on the HPLC elution behavior reveals that there are two isomers for Dy(3)[email protected](78) and Dy(3)[email protected](84). Furthermore, a third isomer of Dy(3)[email protected](80) is isolated for the first time. The optimum production conditions (Dy:C = 1:15, NH(3) pressure = 20 mbar) have been determined by investigating the effects of the Dy:C ratio and NH(3) pressure on the yields of the Dy(3)[email protected](2)(n) clusterfullerenes. UV-vis-NIR spectroscopic study indicates that the Dy(3)[email protected](2)(n) clusterfullerenes with small cages (n = 39-41) are large band-gap (1.38 approximately 1.51 eV) materials, while the band-gaps for those with larger cages (n = 42-44) are significantly smaller (0.80 approximately 0.84 eV).

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