Chlorination, bromination and iodination of bis(methylthio)tetrathiafu
lvalene (BMT-TTF) produced mainly the dihalogenated products (BMT-TTFX
2) with small amounts of the monohalogenated derivatives (BMT-TTFX). T
he molecular structures of BMT-TTFBr2 and BMT-TTFBr2 . I-3 have been d
etermined, and the conductivities of CT-complexes and radical salts de
rived from BMT-TTFX2 have been measured.