Endohedral metallofullerenes M@C82 (M=La, Y): synthesis and transport properties

✍ Scribed by I.E Kareev; V.P Bubnov; E.E Laukhina; V.K Koltover; E.B Yagubskii

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 170 KB
• Volume: 41
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/s0008-6223(03)00064-2

✦ Synopsis

Endohedral metallofullerenes M@C (M5La, Y) were synthesized by the arc-discharge method using optimum electric 2n arc parameters. It was also shown that an organic solvent (N,N-dimethylformamide) is successfully used in selective extraction of M@C . We identified the resulting products by mass spectrometry, electron spectrophotometry, EPR and 2n X-ray fluorescence spectroscopy. The resulting N,N-dimethylformamide extracts of La@C and Y@C are shown to be 2n 2n free of empty fullerenes and appear as a mixture of endometallofullerenes M@C whose main ingredient is M@C (|80 2n 82 wt%). Transport properties of the extracts of La@C and Y@C were studied using pressed pellets. It was found that 82 82

oxygen and heat treatment affect conductivity of endometallofullerenes. Heat treatment results in a three-order increase of 25 22 21 21 conductivity from 10 upto 10 Ohm cm