New fulvalenium salts of cobalt bis(dicarbollide): Crystal structures and electrical conductivities

Abstract

New radical cation salts (BEDT-TTF)[8,8',(7)-Cl2(Cl0.09)-3,3'-Co(1,2- C2B9H9.91)(1',2'-C2B9H10)] (1), (BEDT-TTF)[8,8'-Br0.75Cl1.25-3,3'-Co(1,2-C2B9H10)2] (2), and (BMDT-TTF)4[8,8'-Br1.16(OH)0.72-3,3'-Co(1,2-C2B9H10.06)2] (3) were synthesized, and their crystal structures and electrical conductivities were determined. All the radical cation salts are semiconductors. Compounds 1 and 2 were found to be isostructural, however their electrical conductivities strongly differ (σ293 = 2 Ω-1cm-1 and 10-5 Ω-1cm-1, respectively). © 2011 by the authors; licensee MDPI, Basel, Switzerland.