In the structure of catena-poly [copper(I)-mu-[hexakis(methylthio)benzene-S
-1,S-2:S-4,S-5]] hexafluorophosphate, {[Cu(C12H18S6)]PF6}(n), each Cu atom
is coordinated to four S atoms of two hexakis(methylthio)benzene ligands in
a tetrahedral arrangement to give a cationic linear-chain polymer. The ele
ctrical resistivity of compacted pellets was measured by the conventional t
wo-probe technique. Iodine-doped black products in powder form behave as a
semiconductor with a conductivity of 1.5 x 10(-6) S cm(-1).