Increasing the oxidation power of TCNQ by coordination of B(C 6 F 5 ) 3 .

The oxidation power of the cyanocarbon TCNQ (tetracyano-quinodimethane) can be significantly increased to approximately E = +0.9 V vs. Cp 2 Fe by coordination of up to four equivalents of the strong fluorinated Lewis acid B(C 6 F 5 ) 3 , resulting in a highly reactive but easy-to-use oxidation system. Thianthrene and tris(4-bromophenyl)amine were oxidized to the corresponding radical cations. Dianionic [TCNQ·4 B(C 6 F 5 ) 3 ] 2- was formed upon reduction with two equivalents of ferrocene or decamethylcobaltocene. [TCNQ·4 B(C 6 F 5 ) 3 ] - and [TCNQ·4 B(C 6 F 5 ) 3 ] 2- are rare cases of redox-active weakly-coordinating anions.