Fullerene-containing acceptors for the realizing semiconductive materials.
Elvira I. Musina ( ), G. G. Yusupova, V. V. Kalinin, D. G Yakhvarov, V. V. Zverev, V. I. Kovalenko, I. P. Romanova, O. G. Sinyashin
A. E. Arbusov Institute of Organic and Physical Chemistry, Kasan Research Center of Russian Academy of Sciences, 8 Akad. Arbusov st., Kazan, 420088, Russia.

The development of new materals with superconductive and ferromagnetic properties is of great interest for science and technology. It is known that anion-radical salts of fullerenes or organofullerenes with organic donors may be used as such materials. One of the main requirements for the obtaining of organofullerene salts is their higher electron affinity in comparison with C60. For the search of such organofullerenes we have used the approach based on the synthesis of C60 derivatives with various types of cycles condensed on their surfase and containing electron-accepting organic fragments of different nature. The control of the change of organofullerene electron affinity was carried out by cyclic voltammetry; the experimental results were compared with quantum-chemical computations.

The data obtained showed that for the essential increase of the organofullerene electron affinity the presence of at least two heteroatoms, directly bonded to the fullerene sphere, and a strong ó-electron-withdrawing fragment is necessary.

The experimental data are submited in the table.


Compound

-E1red., V

EAteor.

EAexp.


Ñ60

0.83


2.65

I

0.92


2.56

II

0.82


2.66

III

0.78

2.76

2.70

IV

0.73

2.93

2.75

V

0.75

2.72

2.73


The work was carried out by the support of Russian Foundation for Basic Research (grant. No. 02-03-32932a, 02-03-06-077 (MAC)) and the Russian Ministry of Science (agreements No. 41.002.1.1.405 and 14-2002).