At present only a few conducting radical cation salts containing metallacarborane anions were described [1-3]. It should be noted that no salts derived from the cobalt bis(dicarbollide) anion [3,3'-Co(1,2-C 2 B 9 H 11) 2 ]-, the most studied metallacarborane [4], were reported. Here new electroconducting salts of cobalt bis(dicarbollide) anion: (TMTSF) 2 [Co(C 2 B 9 H 11) 2 ] (1), (TTF)[Co(C 2 B 9 H 11) 2 ] (2) and (ET)[Co(C 2 B 9 H 11) 2 ] (3) were synthesized and investigated. The conductivity of crystals (1) at room temperature is 15 Ohm-1 cm-1 , which is the maximal value for metallacarborane salts. The comparison of the crystal structures of salts (1) and (2) showed, that the substitution of more prolate and volumetric TMTSF cation by a less prolate and volumetric TTF cation results in dramatic structural changes which allow us to explain the decrease of conductivity in (2) in comparison to (1) at 9 orders. Mainly it can be connected with the presence of conducting stacks of TMTSF cations in (1), while in (2) there are no stacks but pairs formed by TTF cations.
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